63 results match your criteria Dynamic Medicine [Journal]


The effects of age on skeletal muscle and the phosphocreatine energy system: can creatine supplementation help older adults.

Dyn Med 2009 Dec 24;8. Epub 2009 Dec 24.

Applied Biochemistry and Molecular Physiology Laboratory, Department of Health & Exercise Science, University of Oklahoma, Norman, OK, USA.

Creatine supplementation has been found to significantly increase muscle strength and hypertrophy in young adults (Read More

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http://dx.doi.org/10.1186/1476-5918-8-6DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2807421PMC
December 2009
5 Reads

The reproducibility of measurements of intramuscular magnesium concentrations and muscle oxidative capacity using 31P MRS.

Dyn Med 2009 Dec 15;8. Epub 2009 Dec 15.

Department of Kinesiology, University of Georgia, Athens, GA, USA.

31P magnetic resonance spectroscopy (31P MRS) has been used to measure intramuscular magnesium concentrations and muscle metabolism. Abnormal intramuscular magnesium has been reported in several patient populations with suspected metabolic disorders. The purpose of this study was to evaluate our ability to measure intramuscular magnesium and muscle metabolism in the quadriceps muscles of healthy subjects, and to test whether these measurements were influenced by prior exercise. Read More

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http://dx.doi.org/10.1186/1476-5918-8-5DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2801477PMC
December 2009
4 Reads

A study of passive weight-bearing lower limb exercise effects on local muscles and whole body oxidative metabolism: a comparison with simulated horse riding, bicycle, and walking exercise.

Dyn Med 2009 Nov 10;8. Epub 2009 Nov 10.

Department of Sports Medicine for Health Promotion, Tokyo Medical University, 6-1-1 Shinjuku, Shinjuku-ku, Tokyo, Japan.

Background: We have developed an exercise machine prototype for increasing exercise intensity by means of passively exercising lower limb muscles. The purpose of the present study was to compare the passive exercise intensity of our newly-developed machine with the intensities of different types of exercises. We also attempted to measure muscle activity to study how these forms of exercise affected individual parts of the body. Read More

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http://dx.doi.org/10.1186/1476-5918-8-4DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2780382PMC
November 2009
6 Reads

A portable system for collecting anatomical joint angles during stair ascent: a comparison with an optical tracking device.

Dyn Med 2009 Apr 23;8. Epub 2009 Apr 23.

Division of Applied Biomedical Research, King's College London, London, UK.

Background: Assessments of stair climbing in real-life situations using an optical tracking system are lacking, as it is difficult to adapt the system for use in and around full flights of stairs. Alternatively, a portable system that consists of inertial measurement units (IMUs) can be used to collect anatomical joint angles during stair ascent. The purpose of this study was to compare the anatomical joint angles obtained by IMUs to those calculated from position data of an optical tracking device. Read More

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http://dynamic-med.biomedcentral.com/articles/10.1186/1476-5
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http://dx.doi.org/10.1186/1476-5918-8-3DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2684094PMC
April 2009
4 Reads

Local increase in trapezius muscle oxygenation during and after acupuncture.

Dyn Med 2009 Mar 16;8. Epub 2009 Mar 16.

National Institute of Fitness and Sports in Kanoya, 1 Shiromizu, Kanoya, Kagoshima, Japan.

Purpose: This study aimed to compare the trapezius muscle blood volume and oxygenation in the stimulation region and in a distant region in the same muscle during acupuncture stimulation (AS). We hypothesized that AS provokes a localized increase in muscle blood volume and oxygenation in the stimulation region.

Methods: Two sets of near-infrared spectrometer (NIRS) probes, with 40-mm light-source detector spacing, were placed on the right trapezius muscle, with a 50-mm distance between the probes. Read More

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http://dx.doi.org/10.1186/1476-5918-8-2DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2662816PMC
March 2009
7 Reads

Acute exercise and oxidative stress: a 30 year history.

Dyn Med 2009 Jan 13;8. Epub 2009 Jan 13.

Cardiorespiratory/Metabolic Laboratory, Department of Health and Sport Sciences, The University of Memphis, 161F Elma Neal Roane Fieldhouse, Memphis, TN 38152, USA.

The topic of exercise-induced oxidative stress has received considerable attention in recent years, with close to 300 original investigations published since the early work of Dillard and colleagues in 1978. Single bouts of aerobic and anaerobic exercise can induce an acute state of oxidative stress. This is indicated by an increased presence of oxidized molecules in a variety of tissues. Read More

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http://dx.doi.org/10.1186/1476-5918-8-1DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2642810PMC
January 2009
9 Reads

Expressing gait-line symmetry in able-bodied gait.

Dyn Med 2008 Dec 19;7:17. Epub 2008 Dec 19.

Department of Biophysics and Human Physiology, Medical University of Warsaw, 5 Chałubińskiego Street, Warsaw, Poland.

Background: Gait-lines, or the co-ordinates of the progression of the point of application of the vertical ground reaction force, are a commonly reported parameter in most in-sole measuring systems. However, little is known about what is considered a "normal" or "abnormal" gait-line pattern or level of asymmetry. Furthermore, no reference databases on healthy young populations are available for this parameter. Read More

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http://dx.doi.org/10.1186/1476-5918-7-17DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2647535PMC
December 2008
3 Reads

Modeling transitions in body composition: the approach to steady state for anthropometric measures and physiological functions in the Minnesota human starvation study.

Dyn Med 2008 Oct 7;7:16. Epub 2008 Oct 7.

24710 Upper Trail Drive, Carmel, CA, USA 93923.

Background: This study evaluated whether the changes in several anthropometric and functional measures during caloric restriction combined with walking and treadmill exercise would fit a simple model of approach to steady state (a plateau) that can be solved using spreadsheet software (Microsoft Excel). We hypothesized that transitions in waist girth and several body compartments would fit a simple exponential model that approaches a stable steady-state.

Methods: The model (an equation) was applied to outcomes reported in the Minnesota starvation experiment using Microsoft Excel's Solver function to derive rate parameters (k) and projected steady state values. Read More

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http://dynamic-med.biomedcentral.com/articles/10.1186/1476-5
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http://dx.doi.org/10.1186/1476-5918-7-16DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2596786PMC
October 2008
8 Reads

The relationships among endurance performance measures as estimated from VO2PEAK, ventilatory threshold, and electromyographic fatigue threshold: a relationship design.

Dyn Med 2008 Sep 10;7:15. Epub 2008 Sep 10.

Department of Health and Exercise Science, University of Oklahoma, Huston Huffman Center, 1401 Asp Ave., Norman, OK 73019, USA.

Background: The use of surface electromyography has been accepted as a valid, non-invasive measure of neuromuscular fatigue. In particular, the electromyographic fatigue threshold test (EMG(FT)) is a reliable submaximal tool to identify the onset of fatigue. This study examined the metabolic relationship between VO(2PEAK), ventilatory threshold (VT), and the EMGFT, as well as compared the power output at VO(2PEAK), VT, and EMG(FT). Read More

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http://dx.doi.org/10.1186/1476-5918-7-15DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2542988PMC
September 2008
4 Reads

Bioelectrical phase angle values in a clinical sample of ambulatory rehabilitation patients.

Dyn Med 2008 Sep 10;7:14. Epub 2008 Sep 10.

Flinders University Department of Rehabilitation and Aged Care, Repatriation General Hospital, Adelaide, Australia.

Background: Phase angle (PhA) is derived from the resistance and reactance measurements obtained from bioelectric impedance analysis (BIA) and is considered indicative of cellular health and membrane integrity. This study measured PhA values of rehabilitation patients and compared them to reference values, measures of functional ability and serum C-reactive protein (CRP) levels to explore their utility as a clinical tool to monitor disease progression and treatment efficacy.

Methods: This cross-sectional observational study was conducted on 215 ambulatory rehabilitation patients aged 20 - 94 years. Read More

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http://dx.doi.org/10.1186/1476-5918-7-14DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2551587PMC
September 2008
4 Reads

Femoral artery remodeling after aerobic exercise training without weight loss in women.

Dyn Med 2008 Sep 8;7:13. Epub 2008 Sep 8.

Department of Kinesiology, The University of Georgia, Athens, GA 30602, USA.

Background: It is currently unclear whether reductions in adiposity mediate the improvements in vascular health that occur with aerobic exercise. The purpose of this longitudinal study of 13 healthy women (33 +/- 4 years old) was to determine whether 14 weeks of aerobic exercise would alter functional measures of vascular health, namely resting aortic pulse wave velocity (aPWV, an index of arterial stiffness), femoral artery diameter (D(FA)), and femoral artery blood flow (BF(FA)) independent of changes in adiposity.

Methods: Aerobic fitness was assessed as VO2peak normalized to fat-free mass, and adiposity (percent body fat) was determined by dual energy x-ray absorptiometry. Read More

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http://dx.doi.org/10.1186/1476-5918-7-13DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2551586PMC
September 2008
3 Reads

Biomechanical influence of TKA designs with varying radii on bilateral TKA patients during sit-to-stand.

Dyn Med 2008 Aug 13;7:12. Epub 2008 Aug 13.

School of Physical Education, Sport, and Exercise Science, Ball State University, Muncie, IN, USA.

Background: Compared to the design of a traditional multi-radius (MR) total knee arthroplasty (TKA), the single-radius (SR) implant investigated has a fixed flexion/extension center of rotation. The biomechanical effectiveness of an SR for functional daily activities, i.e. Read More

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http://dx.doi.org/10.1186/1476-5918-7-12DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2526996PMC
August 2008
35 Reads

The oxygen delivery response to acute hypoxia during incremental knee extension exercise differs in active and trained males.

Dyn Med 2008 Aug 12;7:11. Epub 2008 Aug 12.

Faculty of Rehabilitation Medicine, University of Alberta, Edmonton, Alberta, Canada.

Background: It is well known that hypoxic exercise in healthy individuals increases limb blood flow, leg oxygen extraction and limb vascular conductance during knee extension exercise. However, the effect of hypoxia on cardiac output, and total vascular conductance is less clear. Furthermore, the oxygen delivery response to hypoxic exercise in well trained individuals is not well known. Read More

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http://dx.doi.org/10.1186/1476-5918-7-11DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2526084PMC
August 2008
6 Reads

Monitoring of pre-frontal oxygen status in helicopter pilots using near-infrared spectrophotometers.

Dyn Med 2008 Jul 11;7:10. Epub 2008 Jul 11.

Aeromedical Laboratory, Japan Air Self-Defense Force, Tachikawa, Tokyo, Japan.

Background: There are few in-flight studies of cognition-related cerebral oxygen status in helicopter pilots.

Methods: Four male helicopter pilots volunteered for nine sorties during visual flight in a BK117 and UH-60J. The pilots' pre-frontal oxy-hemoglobin (O2Hb) and deoxy-hemoglobin (HHb) concentration were continuously monitored from the right/left sections of the forehead using near-infrared spectrophotometers with a consideration of motion artifacts. Read More

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http://dx.doi.org/10.1186/1476-5918-7-10DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2503955PMC
July 2008
3 Reads

Patellofemoral pain syndrome (PFPS): a systematic review of anatomy and potential risk factors.

Dyn Med 2008 Jun 26;7. Epub 2008 Jun 26.

Tufts University School of Medicine, Boston, MA, USA.

Background: Patellofemoral Pain Syndrome (PFPS), a common cause of anterior knee pain, is successfully treated in over 2/3 of patients through rehabilitation protocols designed to reduce pain and return function to the individual. Applying preventive medicine strategies, the majority of cases of PFPS may be avoided if a pre-diagnosis can be made by clinician or certified athletic trainer testing the current researched potential risk factors during a Preparticipation Screening Evaluation (PPSE). We provide a detailed and comprehensive review of the soft tissue, arterial system, and innervation to the patellofemoral joint in order to supply the clinician with the knowledge required to assess the anatomy and make recommendations to patients identified as potentially at risk. Read More

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https://dynamic-med.biomedcentral.com/articles/10.1186/1476-
Publisher Site
http://dx.doi.org/10.1186/1476-5918-7-9DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2443365PMC
June 2008
7 Reads

A school-curriculum-based exercise intervention program for two years in pre-pubertal girls does not influence hip structure.

Dyn Med 2008 Apr 28;7. Epub 2008 Apr 28.

Clinical and Molecular Osteoporosis Research Unit, Department of Clinical Sciences, Lund University, Sweden.

Background: It is known that physical activity during growth has a positive influence on bone mineral accrual, and is thus possibly one strategy to prevent osteoporosis. However, as bone geometry, independent of areal bone mineral density (aBMD), influences fracture risk, this study aimed to evaluate whether hip structure in pre-pubertal girls is also affected by a two-year exercise intervention program.

Methods: Forty-two girls aged 7-9 years in a school-curriculum-based exercise intervention program comprising 40 minutes of general physical activity per school day (200 minutes per week) were compared with 43 age-matched girls who participated in the general Swedish physical education curriculum comprising a mean of 60 minutes per week. Read More

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http://dx.doi.org/10.1186/1476-5918-7-8DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2397397PMC
April 2008
6 Reads

Percent body fat estimations in college men using field and laboratory methods: a three-compartment model approach.

Dyn Med 2008 Apr 21;7. Epub 2008 Apr 21.

Department of Health and Exercise Science, Metabolic and Body Composition Laboratories, University of Oklahoma, Norman, OK, USA.

Background: Methods used to estimate percent body fat can be classified as a laboratory or field technique. However, the validity of these methods compared to multiple-compartment models has not been fully established. The purpose of this study was to determine the validity of field and laboratory methods for estimating percent fat (%fat) in healthy college-age men compared to the Siri three-compartment model (3C). Read More

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http://dx.doi.org/10.1186/1476-5918-7-7DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2365941PMC
April 2008
4 Reads

The economic impact of ME/CFS: individual and societal costs.

Dyn Med 2008 Apr 8;7. Epub 2008 Apr 8.

Department of Psychology, Center for Community Research, Depaul University, Chicago, IL, USA.

Background: ME/CFS is characterized by debilitating fatigue in addition to other physical and cognitive symptoms. It is estimated to affect over 800,000 adults in the U.S. Read More

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http://dx.doi.org/10.1186/1476-5918-7-6DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2324078PMC
April 2008
21 Reads

Adolescents with metabolic syndrome have a history of low aerobic fitness and physical activity levels.

Dyn Med 2008 Apr 4;7. Epub 2008 Apr 4.

Departments of Exercise & Sport Science, University of North Carolina, Chapel Hill, NC, USA.

Purpose: Metabolic syndrome (MS) is a clustering of cardiovascular disease risk factors that identifies individuals with the highest risk for heart disease. Two factors that may influence the MS are physical activity and aerobic fitness. This study determined if adolescent with the MS had low levels of aerobic fitness and physical activity as children. Read More

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http://dynamic-med.biomedcentral.com/articles/10.1186/1476-5
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http://dx.doi.org/10.1186/1476-5918-7-5DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2358885PMC
April 2008
4 Reads

The influence of obesity on falls and quality of life.

Dyn Med 2008 Feb 27;7. Epub 2008 Feb 27.

Department of Health and Exercise Science, University of Oklahoma, Norman, OK, USA.

Objective: To determine (1) whether obese older adults had higher prevalence of falls and ambulatory stumbling, impaired balance and lower health-related quality of life (HRQL) than their normal weight counterparts, and (2) whether the falls and balance measures were associated with HRQL in obese adults.

Methods: Subjects who had a body mass index (BMI) greater than 30 kg/m2 were classified into an obese group (n = 128) while those with BMI between 18.5 and 24. Read More

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http://dx.doi.org/10.1186/1476-5918-7-4DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2288598PMC
February 2008
7 Reads

A new evaluation method for +Gz tolerance with loratadine by using a near-infrared spectroscopy.

Dyn Med 2008 Jan 28;7. Epub 2008 Jan 28.

Aeromedical Laboratory, Japan Air Self-Defense Force, Tachikawa, Tokyo, Japan.

Background: Loratadine (Claritin), an over-the-counter antihistamine in U.S. and UK, is acceptable for use without adverse side effects by aircrew with mild or moderate allergic or other situations requiring an antihistamine. Read More

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http://dx.doi.org/10.1186/1476-5918-7-3DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2265702PMC
January 2008
4 Reads

The influence of physical activity and yoga on central arterial stiffness.

Dyn Med 2008 Jan 28;7. Epub 2008 Jan 28.

Department of Kinesiology, University of Georgia, 115 Ramsey Center, Athens, GA 30602, USA.

Purpose: Central arterial stiffness is an accepted risk factor for cardiovascular disease. While aerobic activity is associated with reduced stiffness the influence of practicing yoga is unknown. The aims of this study were to: 1) evaluate arterial stiffness in middle-aged adults who regularly practiced yoga, performed regular exercise, or were inactive, 2) evaluate the reproducibility of arterial stiffness measured in the left and right carotid artery and by pulse wave velocity (PWV). Read More

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http://dx.doi.org/10.1186/1476-5918-7-2DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2265701PMC
January 2008
3 Reads

Low-volume muscular endurance and strength training during 3-week forearm immobilization was effective in preventing functional deterioration.

Dyn Med 2008 Jan 15;7. Epub 2008 Jan 15.

Department of Sports Medicine for Health Promotion, Tokyo Medical University, 6-1-1 Shinjuku, Shinjuku-ku, Tokyo, Japan.

Purpose: The purpose of this study was to determine whether endurance and strength hand grip exercises during 3-week upper limb immobilization preserve muscle oxidative capacity, endurance performance and strength.

Methods: Ten healthy adult men underwent non-dominant forearm immobilization by plaster cast for 21 days. Five healthy adult subjects were designated as the immobilization (IMM) group and five were designated as the immobilization + training (IMM+TRN) group. Read More

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http://dynamic-med.biomedcentral.com/articles/10.1186/1476-5
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http://dx.doi.org/10.1186/1476-5918-7-1DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2254413PMC
January 2008
15 Reads

Modelling the lactate response to short-term all out exercise.

Dyn Med 2007 Nov 9;6:10. Epub 2007 Nov 9.

Biomedical Science, Department of Biological Sciences, University of Essex, Wivenhoe Park, Colchester, UK.

Background: The maximum post exercise blood lactate concentration (BLCmax) has been positively correlated with maximal short-term exercise (MSE) performance. However, the moment when BLCmax occurs (TBLCmax) is rather unpredictable and interpretation of BLC response to MSE is therefore difficult.

Methods: We compared a 3- and a 4-parameter model for the analysis of the dynamics of BLC response to MSEs lasting 10 (MSE10) and 30 s (MSE30) in eleven males (24. Read More

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http://dx.doi.org/10.1186/1476-5918-6-10DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2186329PMC
November 2007
7 Reads

Comparison of two normative paediatric gait databases.

Dyn Med 2007 Jul 17;6. Epub 2007 Jul 17.

Faculty of Kinesiology, Institute of Biomedical Engineering, University of New Brunswick, Fredericton, NB, E3B 5A3, Canada.

The availability of age-matched normative data is an essential component of clinical gait analyses. Comparison of normative gait databases is difficult due to the high-dimensionality and temporal nature of the various gait waveforms. The purpose of this study was to provide a method of comparing the sagittal joint angle data between two normative databases. Read More

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http://dx.doi.org/10.1186/1476-5918-6-8DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1947956PMC
July 2007
4 Reads

Management of intestinal failure in Europe. A questionnaire based study on the incidence and management.

Dyn Med 2007 Jul 4;6. Epub 2007 Jul 4.

Department of Medical Gastroenterology, Rigshospitalet, Copenhagen, Denmark.

Background: Intestinal failure is the outcome of a number of gastrointestinal diseases and characterized by significant reduction in functional gut mass. If not resolved patients often face long-term nutritional support. This study gathered information about how patients referred with intestinal failure are managed in specialised European centres. Read More

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http://dx.doi.org/10.1186/1476-5918-6-7DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1945021PMC
July 2007
23 Reads

Functioning in individuals with chronic fatigue syndrome: increased impairment with co-occurring multiple chemical sensitivity and fibromyalgia.

Dyn Med 2007 May 31;6. Epub 2007 May 31.

Department of Psychology, DePaul University, Center for Community Research, Chicago, IL, USA.

Background: Chronic fatigue syndrome (CFS), multiple chemical sensitivity (MCS), and fibromyalgia (FM) commonly co-occur. Some propose that CFS, MCS, and FM are manifestations of the same illness based on high rates of co-occurrence and overlapping diagnostic criteria. This study seeks to differentiate these diagnoses by comparing individuals with one or more illness on functioning, psychiatric comorbidity, coping style, and in vivo physical measures. Read More

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http://dynamic-med.biomedcentral.com/articles/10.1186/1476-5
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http://dx.doi.org/10.1186/1476-5918-6-6DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1890280PMC
May 2007
4 Reads

Exercise-induced blood flow in relation to muscle relaxation period.

Dyn Med 2007 May 9;6. Epub 2007 May 9.

National Institute of Fitness and Sports in Kanoya, 1 Shiromizu, Kanoya, Kagoshima 891-2393, Japan.

Background: Dynamic exercise is characterized by relaxation periods between contractions. The relaxation period should be considered as a causal factor for determining the magnitude of blood flow during dynamic exercise. The purpose of this study was to investigate the effect of muscle relaxation periods determined by the response of each subject on the exercise-induced blood flow response. Read More

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http://dx.doi.org/10.1186/1476-5918-6-5DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1878472PMC
May 2007
4 Reads

The influence of obesity on calf blood flow and vascular reactivity in older adults.

Dyn Med 2007 Mar 26;6. Epub 2007 Mar 26.

Department of Health and Exercise Science, University of Oklahoma, Norman, OK, USA.

Objective: To determine whether differences in vascular reactivity existed among normal weight, overweight, and obese older men and women, and to examine the association between abdominal fat distribution and vascular reactivity.

Methods: Eighty-seven individuals who were 60 years of age or older (age = 69 +/- 7 yrs; mean +/- SD) were grouped into normal weight (BMI < 25; n = 30), overweight (BMI > or = 25 and < 30; n = 28), or obese (BMI > or = 30; n = 29) categories. Calf blood flow (BF) was assessed by venous occlusion strain-gauge plethysmography at rest and post-occlusive reactive hyperemia. Read More

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http://dx.doi.org/10.1186/1476-5918-6-4DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1852303PMC
March 2007
5 Reads

Influence of venous emptying on the reactive hyperemic blood flow response.

Dyn Med 2007 Mar 14;6. Epub 2007 Mar 14.

Department of Kinesiology, Louisiana State University, Baton Rouge, LA, USA.

Background: Previous research indicates that venous emptying serves as a stimulus for vasodilation in the human forearm. This suggests the importance of recognizing the potential influence of venous volume on reactive hyperemic blood flow (RHBF) following occlusion. The purpose of this study was to examine the influence of venous emptying on forearm vascular function. Read More

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http://dx.doi.org/10.1186/1476-5918-6-3DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1831466PMC
March 2007
6 Reads

Hypocapnia is a biological marker for orthostatic intolerance in some patients with chronic fatigue syndrome.

Dyn Med 2007 Jan 30;6. Epub 2007 Jan 30.

Department of Neurosciences, UMDNJ-New Jersey Medical School, Newark NJ, USA.

Context: Patients with chronic fatigue syndrome and those with orthostatic intolerance share many symptoms, yet questions exist as to whether CFS patients have physiological evidence of orthostatic intolerance.

Objective: To determine if some CFS patients have increased rates of orthostatic hypotension, hypertension, tachycardia, or hypocapnia relative to age-matched controls.

Design: Assess blood pressure, heart rate, respiratory rate, end tidal CO2 and visual analog scales for orthostatic symptoms when supine and when standing for 8 minutes without moving legs. Read More

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http://dx.doi.org/10.1186/1476-5918-6-2DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1796865PMC
January 2007
3 Reads

Regional changes in reactive hyperemic blood flow during exercise training: time-course adaptations.

Dyn Med 2007 Jan 12;6. Epub 2007 Jan 12.

Department of Kinesiology, Louisiana State University, Baton Rouge, Louisiana, USA.

Background: Few studies have examined the time-course of localized exercise training on regional blood flow in humans. The study examined the influence of handgrip exercise training on forearm reactive hyperemic blood flow and vascular resistance in apparently healthy men.

Methods: Forearm blood flow and vascular resistance were evaluated, in 17 individuals [Age: 22. Read More

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http://dx.doi.org/10.1186/1476-5918-6-1DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1779772PMC
January 2007
6 Reads

Oxygen cost of dynamic or isometric exercise relative to recruited muscle mass.

Dyn Med 2006 Sep 11;5. Epub 2006 Sep 11.

Department of Kinesiology, The University of Georgia, Athens, GA, USA.

Background: Oxygen cost of different muscle actions may be influenced by different recruitment and rate coding strategies. The purpose of this study was to account for these strategies by comparing the oxygen cost of dynamic and isometric muscle actions relative to the muscle mass recruited via surface electrical stimulation of the knee extensors.

Methods: Comparisons of whole body pulmonary delta VO2 were made in seven young healthy adults (1 female) during 3 minutes of dynamic or isometric knee extensions, both induced by surface electrical stimulation. Read More

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http://dx.doi.org/10.1186/1476-5918-5-9DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1579205PMC
September 2006
4 Reads

Regional muscle oxygenation differences in vastus lateralis during different modes of incremental exercise.

Dyn Med 2006 Jul 3;5. Epub 2006 Jul 3.

Faculty of Rehabilitation Medicine, University of Alberta, Edmonton, Alberta, Canada.

Background: Near infrared spectroscopy (NIRS) is used to assess muscle oxygenation (MO) within skeletal muscle at rest and during aerobic exercise. Previous investigations have used a single probe placement to measure MO during various forms of exercise. However, regional MO differences have been shown to exist within the same muscle which suggests that different areas of the same muscle may have divergent MO. Read More

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http://dx.doi.org/10.1186/1476-5918-5-8DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1524724PMC
July 2006
10 Reads

Shoulder muscle EMG activity during push up variations on and off a Swiss ball.

Dyn Med 2006 Jun 9;5. Epub 2006 Jun 9.

Department of Graduate Studies, Canadian Memorial Chiropractic College, Toronto, ON, Canada.

Background: Surface instability is a common addition to traditional rehabilitation and strength exercises with the aim of increasing muscle activity, increasing exercise difficulty and improving joint proprioception. The aim of the current study was to determine if performing upper body closed kinetic chain exercises on a labile surface (Swiss ball) influences myoelectric amplitude when compared with a stable surface.

Methods: Thirteen males were recruited from a convenience sample of college students. Read More

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http://dx.doi.org/10.1186/1476-5918-5-7DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1508143PMC
June 2006
9 Reads

Assessment of neuromuscular and haemodynamic activity in individuals with and without chronic low back pain.

Dyn Med 2006 May 31;5. Epub 2006 May 31.

Faculty of Kinesiology and Health Studies, University of Regina, Saskatchewan, Canada.

Background: Biering-Sørenson (1984) found that individuals with less lumbar extensor muscle endurance had an increased occurrence of first episode low back pain. As a result, back endurance tests have been recommended for inclusion in health assessment protocols. However, different studies have reported markedly different values for endurance times, leading some researchers to believe that the back is receiving support from the biceps femoris and gluteus maximus. Read More

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http://dx.doi.org/10.1186/1476-5918-5-6DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1489922PMC
May 2006
4 Reads

A novel method to measure regional muscle blood flow continuously using NIRS kinetics information.

Dyn Med 2006 May 16;5. Epub 2006 May 16.

Department of Biochemistry and Biophysics, Medical School of University of Pennsylvania, Philadelphia, PA 19104, USA.

Background: This article introduces a novel method to continuously monitor regional muscle blood flow by using Near Infrared Spectroscopy (NIRS). We demonstrate the feasibility of the new method in two ways: (1) by applying this new method of determining blood flow to experimental NIRS data during exercise and ischemia; and, (2) by simulating muscle oxygenation and blood flow values using these newly developed equations during recovery from exercise and ischemia.

Methods: Deoxy (Hb) and oxyhemoglobin (HbO2), located in the blood of the skeletal muscle, carry two internal relationships between blood flow and oxygen consumption. Read More

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http://dx.doi.org/10.1186/1476-5918-5-5DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1540409PMC
May 2006
6 Reads

Biphasic responses of the brachial artery diameter following forearm occlusion: a blunted response in the elderly.

Dyn Med 2006 Apr 5;5. Epub 2006 Apr 5.

Department of Kinesiology, Louisiana State University, Baton Rouge, LA, USA.

Background: The purpose was to examine the temporal response of the brachial artery diameter following 5 minutes of forearm occlusion in young men. A secondary objective was to compare the main features of the temporal pattern between young and old.

Methods: Sixteen young (28 +/- 8 yrs) and fifteen older (85 +/- 8 yrs) men underwent high-resolution ultrasonography of the brachial artery before and after five minutes of forearm occlusion. Read More

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http://dx.doi.org/10.1186/1476-5918-5-4DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1456951PMC
April 2006
9 Reads

Virtual cooperativity in myoglobin oxygen saturation curve in skeletal muscle in vivo.

Authors:
Akitoshi Seiyama

Dyn Med 2006 Jan 24;5. Epub 2006 Jan 24.

Division of Physiology and Biosignaling, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka 565-0871, Japan.

Background: Myoglobin (Mb) is the simplest monomeric hemoprotein and its physicochemical properties including reversible oxygen (O2)binding in aqueous solution are well known. Unexpectedly, however, its physiological role in intact muscle has not yet been established in spite of the fact that the role of the more complex tetrameric hemoprotein, hemoglobin (Hb), in red cells is well established. Here, I report my new findings on an overlooked property of skeletal Mb. Read More

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http://dx.doi.org/10.1186/1476-5918-5-3DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1397806PMC
January 2006
3 Reads

Sex differences in the rate of fatigue development and recovery.

Dyn Med 2006 Jan 16;5. Epub 2006 Jan 16.

Human Performance Laboratory, Faculty of Kinesiolgy, University of New Brunswick, Fredericton, New Brunswick, Canada.

Background: Many musculoskeletal injuries in the workplace have been attributed to the repetitive loading of muscle and soft tissues. It is not disputed that muscular fatigue is a risk factor for musculoskeletal injury, however the disparity between gender with respect to muscular fatigability and rate of recovery is not well understood. Current health and safety guidelines do not account for sex differences in fatiguability and may be predisposing one gender to greater risk. Read More

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http://dx.doi.org/10.1186/1476-5918-5-2DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1368970PMC
January 2006
5 Reads

Increase of free Mg2+ in the skeletal muscle of chronic fatigue syndrome patients.

Dyn Med 2006 Jan 11;5. Epub 2006 Jan 11.

Department of Kinesiology, University of Georgia, Athens, GA 30602, USA.

In a previous study we evaluated muscle blood flow and muscle metabolism in patients diagnosed with chronic fatigue syndrome (CFS). To better understand muscle metabolism in CFS, we re-evaluated our data to calculate free Magnesium levels in skeletal muscle. Magnesium is an essential cofactor in a number of cell processes. Read More

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http://dx.doi.org/10.1186/1476-5918-5-1DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1360067PMC
January 2006
5 Reads

Time course of exercise induced alterations in daily activity in chronic fatigue syndrome.

Dyn Med 2005 Oct 28;4:10. Epub 2005 Oct 28.

Department of Kinesiology, The University of Georgia, Athens, GA, USA.

In a previous study we demonstrated that while people with CFS had lower daily activity levels than control subjects, they were able to increase daily activity via a daily walking program. We reanalyzed our data to determine the time course of activity changes during the walking program. Daily activity assessed via an accelometer worn at the hip was divided into sleep, active, and walking periods. Read More

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http://dx.doi.org/10.1186/1476-5918-4-10DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1280928PMC
October 2005
19 Reads

Changes in infant segment inertias during the first three months of independent walking.

Dyn Med 2005 Oct 28;4. Epub 2005 Oct 28.

Human Movement Studies, Laurentian University, Sudbury, ON, Canada.

Background: During infancy, rapid changes in physical growth affect the size and shape of the body segments. To understand the effects of growth on movement, it is first necessary to quantify rates of development during the acquisition of important motor milestones. The goal of this longitudinal study was to quantify the physical growth of infant body segments during the initial stages of independent walking. Read More

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http://dx.doi.org/10.1186/1476-5918-4-9DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1282585PMC
October 2005
4 Reads

Effect of short schemes on body composition measurements using air-displacement plethysmography.

Dyn Med 2005 Jul 26;4. Epub 2005 Jul 26.

Department of Health and Exercise Sciences, University of Oklahoma, Norman, OK, USA.

Background: Air-displacement plethysmography (ADP) is becoming a popular method to assess body composition. Several studies have shown certain types of clothing can affect measurements of body density, however no study has specifically investigated the effect of cotton gym shorts and spandex bicycle shorts on body density.

Methods: Thirty-seven males (23. Read More

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http://dx.doi.org/10.1186/1476-5918-4-8DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1187904PMC
July 2005
3 Reads

Free Mg2+ concentration in the calf muscle of glycogen phosphorylase and phosphofructokinase deficiency patients assessed in different metabolic conditions by 31P MRS.

Dyn Med 2005 Jun 6;4. Epub 2005 Jun 6.

Dipartimento di Medicina Clinica e Biotecnologia Applicata, Università di Bologna, Italy.

Background: The increase in cytosolic free Mg2+ occurring during exercise and initial recovery in human skeletal muscle is matched by a decrease in cytosolic pH as shown by in vivo phosphorus magnetic resonance spectroscopy (31P MRS). To investigate in vivo to what extent the homeostasis of intracellular free Mg2+ is linked to pH in human skeletal muscle, we studied patients with metabolic myopathies due to different disorders of glycogen metabolism that share a lack of intracellular acidification during muscle exercise.

Methods: We assessed by 31P MRS the cytosolic pH and free magnesium concentration ([Mg2+]) in calf muscle during exercise and post-exercise recovery in two patients with McArdle's disease with muscle glycogen phosphorylase deficiency (McArdle), and two brothers both affected by Tarui's disease with muscle phosphofructokinase deficiency (PFK). Read More

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http://dx.doi.org/10.1186/1476-5918-4-7DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1166570PMC
June 2005
10 Reads

Replacing a Swiss ball for an exercise bench causes variable changes in trunk muscle activity during upper limb strength exercises.

Dyn Med 2005 Jun 3;4. Epub 2005 Jun 3.

Department of Graduate Studies, Canadian Memorial Chiropractic College, Toronto, ON, Canada.

Background: The addition of Swiss balls to conventional exercise programs has recently been adopted. Swiss balls are an unstable surface which may result in an increased need for force output from trunk muscles to provide adequate spinal stability or balance. The aim of the study was to determine whether the addition of a Swiss ball to upper body strength exercises results in consistent increases in trunk muscle activation levels. Read More

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http://dynamic-med.biomedcentral.com/articles/10.1186/1476-5
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http://dx.doi.org/10.1186/1476-5918-4-6DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1177975PMC
June 2005
4 Reads

Paramagnetic artifact and safety criteria for human brain mapping.

Dyn Med 2005 May 7;4(1). Epub 2005 May 7.

Brain Information Group, Kansai Advanced Research Center, Communications Research Laboratory, 588-2 Iwaoka, Nishi-ku, Kobe, Hyogo 651-2492, Japan.

Biological effects of magnetic field and their safety criteria, especially effects of gradient magnetic field on the cerebral and pulmonary circulation during functional brain mapping are still unclear. Here we estimated that magnetically induced artifacts for the blood oxygenation level- and flow- based functional magnetic resonance imaging are less than 0.1%, and disturbance in the pulmonary circulation is less than 1. Read More

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http://dx.doi.org/10.1186/1476-5918-4-5DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1142518PMC
May 2005
4 Reads

Muscle oxygenation trends after tapering in trained cyclists.

Dyn Med 2005 Mar 24;4(1). Epub 2005 Mar 24.

Faculty of Kinesiology, University of New Brunswick, Fredericton, New Brunswick, Canada.

BACKGROUND: This study examined muscle deoxygenation trends before and after a 7-day taper using non-invasive near infrared spectroscopy (NIRS). METHODS: Eleven cyclists performed an incremental cycle ergometer test to determine maximal oxygen consumption (VO2max = 4.68 +/- 0. Read More

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http://dx.doi.org/10.1186/1476-5918-4-4DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1079910PMC
March 2005
4 Reads

Increased daily physical activity and fatigue symptoms in chronic fatigue syndrome.

Dyn Med 2005 Mar 3;4(1). Epub 2005 Mar 3.

Department of Exercise Science, The University of Georgia, Athens, GA, USA.

Individuals with chronic fatigue syndrome (CFS) have been shown to have reduced activity levels associated with heightened feelings of fatigue. Previous research has demonstrated that exercise training has beneficial effects on fatigue-related symptoms in individuals with CFS. PURPOSE: The aim of this study was to sustain an increase in daily physical activity in CFS patients for 4 weeks and assess the effects on fatigue, muscle pain and overall mood. Read More

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http://dx.doi.org/10.1186/1476-5918-4-3DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC555551PMC
March 2005
4 Reads

Muscle oxidative metabolism accelerates with mild acidosis during incremental intermittent isometric plantar flexion exercise.

Dyn Med 2005 Feb 20;4(1). Epub 2005 Feb 20.

Department of Preventive Medicine and Public Health, Tokyo Medical University, 6-1-1 Shinjuku, Shinjuku-ku, Tokyo, 160-8402, Japan.

BACKGROUND: It has been thought that intramuscular ADP and phosphocreatine (PCr) concentrations are important regulators of mitochondorial respiration. There is a threshold work rate or metabolic rate for cellular acidosis, and the decrease in muscle PCr is accelerated with drop in pH during incremental exercise. We tested the hypothesis that increase in muscle oxygen consumption (o2mus) is accelerated with rapid decrease in PCr (concomitant increase in ADP) in muscles with drop in pH occurs during incremental plantar flexion exercise. Read More

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http://dx.doi.org/10.1186/1476-5918-4-2DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1079909PMC
February 2005
4 Reads