Publications by authors named "Fatma Rhibi"

9 Publications

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The effects of exercise training on plasma volume variations: A systematic review.

Int J Sports Med 2021 Oct 12. Epub 2021 Oct 12.

Higher Institute of Sport and Physical Education of Ksar-Saïd, Manouba, Tunisia., Higher Institute of Sport and Physical Education of Ksar-Saïd, Manouba, Tunisia., Tunis, Tunisia.

The aim of this systematic review was to summarize the evidence on the acute and long-term effects of exercise training on PV, in both trained and untrained individuals and to examine associations between changes in %PVV and change in physical/physiological performance. Despite the status of participants and the exercise duration or intensity, all the acute studies reported a significant decrease of PV (effect size: 0.85
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http://dx.doi.org/10.1055/a-1667-6624DOI Listing
October 2021

Effect of training at intensities around critical velocity on 400 meters front crawl performance in young swimmers.

J Sports Med Phys Fitness 2021 Mar 26. Epub 2021 Mar 26.

Higher Institute of Sport and Physical Education of Ksar-Said, University of Manouba, Manouba, Tunisia.

Background: Young swimmers are rarely involved in training control, leading to inadequate volume and prescription of training intensities. This study aimed to examine the effect of prescribing and monitoring training intensities around critical velocity (CV) on 400 m frontcrawl performance during an 8-weeks period.

Methods: Twenty young male swimmers (13.4±1.0 years) were randomly assigned into two groups. The experimental group (EG) used training monitoring based on intensities around CV (95, 100, 105 and 110% of CV), while for the control group (CG) different heart-rate (HR) zones (EN1+, EN2, EN2+ and EN3) were used as an intensity criterion. The training volume was the same for both EG and CG. A maximal 400 m front-crawl test was performed before and after the 8-week period to determine CV intensities and to assess alternations in performance. The rate of perceived exertion (RPE) and HR values were also evaluated.

Results: Significant main effects of time were observed for T400, CV, HR and RPE. A significant group x time interaction was found for T400 (p=0.035, effect size=1.07, moderate). Results revealed significant pre-to-post improvements for both EG (from 328.46±26.25 to 305.88±20.09) and CG (from 329.07±25.24 to 314.75±19.87). A significant group x time interaction was also found for CV (p=0.005, effect size=1.51, large). Results revealed significant pre-to-post improvements for both EG (from 1.126±0.08 to 1.207±0.07) and CG (from 1.124±0.08 to 1.173±0.07).

Conclusions: Both training methods induced significant improvements in 400 m front-crawl performance with a greater degree for the training prescription and monitoring using CV intensities.
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http://dx.doi.org/10.23736/S0022-4707.21.12314-XDOI Listing
March 2021

Effect of three fitness programs on strength, speed, flexibility and muscle power on sedentary subjects.

J Sports Med Phys Fitness 2021 Feb 8. Epub 2021 Feb 8.

Higher Institute of Sport and Physical Education of Ksar-Said, Manouba, Tunisia.

Background: The aim of this study was to research and compare the effect of Crossfit® (CF), LesMills® (LM) and traditional resistance (TRAD) training program on short performances.

Methods: Participants were assigned randomly into 3 groups and followed the training sessions allocated at the rate of 5 sessions/week for 16 weeks. A battery of tests including anthropometric and performance measures were carried out over three sessions: before training (T0), after eight weeks (T1) and sixteen weeks of training (T2).

Results: Findings indicated that strength tests demonstrated a significant time effect (p<0.001, ηp 2=0.6), the results showed that CF and TRAD groups improved strength every 8 weeks while LM group only at T2, The speed test demonstrated also a significant time effect (p<0.001 , ηp 2=0.5) the results showed an improvement in speed every 8 weeks for LM, at T2 for CF and no change for TRAD, for flexibility, all tests demonstrated a main time effect (p<0.001 , ηp 2=0.46 - 0.7) CF was the best in shoulder range of motion and LM in trunk and lower limb flexibility, all power tests also demonstrated a significant time effect (p<0.001 , ηp 2=0.76 - 0.9) the improvement for all groups was every 8 weeks.

Conclusions: Based on these findings, we recommend TRAD and CF as valuable trainings for strength development, LM for flexibility and all three trainings for power improvement.
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http://dx.doi.org/10.23736/S0022-4707.21.12086-9DOI Listing
February 2021

Exercise Training and Fasting: Current Insights.

Open Access J Sports Med 2020 21;11:1-28. Epub 2020 Jan 21.

Higher Institute of Sport and Physical Education, Ksar-Said, University of Manouba, Manouba, Tunisia.

Fasting is defined as the abstinence from consuming food and/or beverages for different periods of time. Both traditional and modern healthcare systems recommend fasting as a therapeutic intervention for the management of several chronic, non-infectious diseases. Exercising during a fasting state increases lipolysis in adipose tissue while also stimulating peripheral fat oxidation, resulting in increased fat utilization and weight loss. A key focus of this review is to assess whether endurance training performed while fasting induces specific training adaptations, where increased fat oxidation improves long-term endurance levels. Fasting decreases body weight, lean body and fat content in both trained and untrained individuals. Several studies indicate a broader impact of fasting on metabolism, with effects on protein and glucose metabolism in sedentary and untrained subjects. However, there are conflicting data regarding the effects of fasting on glucose metabolism in highly trained athletes. The effects of fasting on physical performance indicators also remain unclear, with some reporting a decreased performance, while others found no significant effects. Differences in experimental design, severity of calorie restriction, duration, and participant characteristics could, at least in part, explain such discordant findings. Our review of the literature suggests that there is little evidence to support the notion of endurance training and fasting-mediated increases in fat oxidation, and we recommend that endurance athletes should avoid high intensity training while fasting.
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http://dx.doi.org/10.2147/OAJSM.S224919DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6983467PMC
January 2020

The TNF-α, P53 protein response and lung respiratory changes to exercise, chronic hypoxia and Adiantum capillus-veneris supplementation.

Adv Respir Med 2019 ;87(4):226-234

Université de Rennes, M2S, Laboratoire Mouvement, Sport, Santé, Rennes, France.

Introduction: Evidence suggests that hypoxia and high-intensity exercise training can increase apoptosis of lung cells and Adiantum capillus-veneris (Ac-v) extract can have anti-apoptotic effects. Thus, the aim of the present study was to investigate the effect of chronic hypoxia and the (Ac-v) extraction as a supplement on TNF-a and P53 protein expression as well as the respiratory surface.

Material And Methods: 24 healthy Wistar rats (age = 4 weeks, weight = 72 = 9 gr) were trained using interval training for 6 weeks followed by a 3-week stay in hypoxia conditions. Half of the hypoxia samples received 500 ml/gr/per body weight daily (Ac-v) within 3 weeks of hypoxia. At the end, the lung tissue was removed for histological and immunohistological analysis.

Results: After 3 weeks of hypoxia exposure following 6 weeks of exercise, expression of P53 and TNF-a increased and the respiratory surface decreased (p ≤ 0.05). After 3 weeks of taking the Ac-v extract during hypoxia exposure, reduced P53 and TNF-a expression and the increased respiratory surface were observed (p ≤ 0.05).

Conclusions: Chronic hypoxia may be considered as a strong stimulus leading to the expression of proteins involved in apoptosis and tissue disruption. However, our findings suggest that the antioxidative properties of Ac-v extract could decrease the destructive structural and molecular events that happen along with hypoxia exposure or intense exercise training.
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http://dx.doi.org/10.5603/ARM.2019.0037DOI Listing
February 2020

Effects of a six-week period of congested match play on plasma volume variations, hematological parameters, training workload and physical fitness in elite soccer players.

PLoS One 2019 25;14(7):e0219692. Epub 2019 Jul 25.

Higher Institute of Sport and Physical Education of Ksar-Said, University of Manouba, Tunis, Tunisia.

Objectives: The aims of this study were to investigate the effects of a six-week in-season period of soccer training and games (congested period) on plasma volume variations (PV), hematological parameters, and physical fitness in elite players. In addition, we analyzed relationships between training load, hematological parameters and players' physical fitness.

Methods: Eighteen elite players were evaluated before (T1) and after (T2) a six-week in-season period interspersed with 10 soccer matches. At T1 and T2, players performed the Yo-Yo intermittent recovery test level 1 (YYIR1), the repeated shuttle sprint ability test (RSSA), the countermovement jump test (CMJ), and the squat jump test (SJ). In addition, PV and hematological parameters (erythrocytes [M/mm3], hematocrit [%], hemoglobin [g/dl], mean corpuscular volume [fl], mean corpuscular hemoglobin content [pg], and mean hemoglobin concentration [%]) were assessed. Daily ratings of perceived exertion (RPE) were monitored in order to quantify the internal training load.

Results: From T1 to T2, significant performance declines were found for the YYIR1 (p<0.001, effect size [ES] = 0.5), RSSA (p<0.01, ES = 0.6) and SJ tests (p< 0.046, ES = 0.7). However, no significant changes were found for the CMJ (p = 0.86, ES = 0.1). Post-exercise, RSSA blood lactate (p<0.012, ES = 0.2) and PV (p<0.01, ES = 0.7) increased significantly from T1 to T2. A significant decrease was found from T1 to T2 for the erythrocyte value (p<0.002, ES = 0.5) and the hemoglobin concentration (p<0.018, ES = 0.8). The hematocrit percentage rate was also significantly lower (p<0.001, ES = 0.6) at T2. The mean corpuscular volume, mean corpuscular hemoglobin content and the mean hemoglobin content values were not statistically different from T1 to T2. No significant relationships were detected between training load parameters and percentage changes of hematological parameters. However, a significant relationship was observed between training load and changes in RSSA performance (r = -0.60; p<0.003).

Conclusions: An intensive period of "congested match play" over 6 weeks significantly compromised players' physical fitness. These changes were not related to hematological parameters, even though significant alterations were detected for selected measures.
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http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0219692PLOS
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6657839PMC
February 2020

Increase interval training intensity improves plasma volume variations and aerobic performances in response to intermittent exercise.

Physiol Behav 2019 02 17;199:137-145. Epub 2018 Nov 17.

Laboratory of Biomonitoring of the Environment, Faculty of Science of Bizerte, University of Carthage, Tunisia; High Institute of Sports and Physical Education (ISSEP) Ksar Saïd, University of Manouba, Tunisia. Electronic address:

Purpose: We studied the effect of two interval training programs of varying intensities (100% vs. 110% of maximal aerobic velocity [MAV]) on hematocrit (Ht), hemoglobin (Hb), and plasma volume variations (PVV) in young men.

Methods: Thirty-nine male volunteered were assigned to two control groups (CG, n = 9 and CG, n = 10), and two training groups (one with 100% MAV [EG, n = 10] and one with 110% MAV [EG, n = 10]). All participants performed a maximal graded exercise test and an intermittent exercise (IE) protocol. Blood was collected at rest, at the end of the IE and after 15 min of recovery, before and after 8-weeks-training. Interval training (IT) sessions consist of 30s IE run at 100% or 110% MAV with 30s recovery at 50% MAV.

Results: After training, time to exhaustion (TTE) was improved in EG (+613.7) and EG (+397.5). This improvement was greater in EG than EG (p < 0.005). After training, Hb deceased in EG and EG at rest (p < 0.01), at the end of IE (p = 0.000) and after 15 min of recovery (p = 0.01). This decrease was more slightly more substantial at rest in EG (-0.6%) than EG (-0.3%). After training, Ht decreased in EG and EG at rest (p = 0.001), at the end of IE (p = 0.000) and at 15 min of recovery (p = 0.01). This decrease was more important in EG than EG at rest (-2.7%), at the end of IE (-2.1%) and after 15 min recovery. After training, PVV and PVV increased in EG (+2.2%) and EG (+3.2%). No significant difference between EG and EG was observed.

Conclusion: Increasing IT intensity by 10% MAV increases PVV and PVV. Despite the fact that EG and EG had the same PVV after training, greater performances were recorded in EG.
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http://dx.doi.org/10.1016/j.physbeh.2018.11.020DOI Listing
February 2019

Somatotype Hormone Levels and Physical Fitness in Elite Young Soccer Players over a Two-Year Monitoring Period.

J Sports Sci Med 2018 Sep 14;17(3):455-464. Epub 2018 Aug 14.

Univ Rennes, M2S (Laboratoire Mouvement, Sport, Santé), Rennes, France.

The effect of two soccer-training seasons on the growth, development and somatotype hormone concentrations of elite youth soccer players were evaluated. Eighteen elite soccer players and 18 age-matched non-athletic control subjects participated in the study. Anthropometric-measurements, aerobic and anaerobic performance tests and serum concentrations of insulin-like growth factor-1 (IGF-1), insulin-like growth factor binding protein-3 (IGFBP-3), and growth hormone (GH) were assessed at 5 time points across two competitive seasons. Soccer players revealed higher GH, IGF-1 and IGFBP-3 than the control group across all-time points. Significant moderate correlations were observed only in soccer players between hormonal concentrations (IGF-1 and IGFBP-3) and the jumping tests (r = 0.45-0.48; p < 0.01). Somatotropic axis hormones, anthropometric and physical parameters increased to a greater degree with growth and soccer training combined compared to growth alone. Results from this investigation revealed that intense training did not impair growth or development in these young soccer players across 2-year period.
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6090385PMC
September 2018

Combined sprint and resistance training abrogates age differences in somatotropic hormones.

PLoS One 2017 11;12(8):e0183184. Epub 2017 Aug 11.

Tunisian Research Laboratory "Sport Performance Optimization" National Center of Medicine and Science in Sports, Tunis, Tunisia.

The aim of this investigation was to compare serum growth hormone (GH), insulin-like growth factor-1 (IGF-1) and insulin-like growth factor-binding protein-3 (IGFBP-3) in response to a combined sprint and resistance training (CSRT) program in young and middle-aged men.Thirty-eight healthy, moderately trained men participated in this study. Young and middle-aged men were randomly assigned to, a young training group (YT = 10, 21.4±1.2yrs) ora young control group (YC = 9, 21.6±1.8 yrs), a middle-aged training group (MAT = 10, 40.4±2.1 yrs) or a middle-aged control group (MAC = 9, 40.5±1.8 yrs). Participants performed the Wingate Anaerobic Test (WAnT) before and after a 13-week CSRT program (three sessions per week). Blood samples were collected at rest, after warm-up, immediately post-WAnT, and 10 min post-WAnT. CSRT induced increases in GH at rest and in response to the WAnT in YT and MAT (P<0.05). CSRT-induced increases were observed for IGF-1 and IGFBP-3 at rest in MAT only (P<0.05). Pre-training, GH, IGF-1 and IGFBP-3 were significantly higher at rest and in response to the WAnT in young participants as compared to their middle-aged counterparts (P<0.05). Post-training, YT and MAT had comparable basal GH (P>0.05). In response to the WAnT, amelioration of the age-effect was observed between YT and MAT for IGF-1 and IGF-1/IGFBP-3 ratio following CSRT (P>0.05). These data suggest that CSRT increases the activity of the GH/IGF-1 axis at rest and in response to the WAnT in young and middle-aged men. In addition, CSRT reduces the normal age-related decline of somatotropic hormones in middle-age men.
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http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0183184PLOS
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5553853PMC
October 2017
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