Publications by authors named "Rodrigo Paschoal Prado"

4 Publications

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NEUROMUSCULAR ELECTRICAL STIMULATION OF MEDIUM AND LOW FREQUENCY ON THE QUADRICEPS FEMORIS.

Acta Ortop Bras 2018 ;26(5):346-349

Universidade Federal de Goiás (UFG), Department of Physical Therapy, Jatai, GO, Brazil.

Objective: The purpose of this study was to investigate the effects of neuromuscular electrical stimulation (NMES) in different frequencies on the quadriceps femoris. A randomized, controlled, blind cross-sectional study.

Methods: Thirty subjects (12 men and 18 women), with an average age of 24.67 years, weight of 65.62 kg and height of 1.69 m were evaluated. Three random test conditions were applied: maximum voluntary isometric contraction (MVIC), maximum voluntary isometric contraction with medium frequency current (MVIC-MF) and maximum voluntary isometric contraction with low frequency current (MVIC-LF). Four MVICs were applied in each situation. The time between different isometric contraction types was 90 seconds while the time between the same conditions of contraction was 10 seconds.

Results: Two-way ANOVA test showed that MVIC-MF had higher values for peak torque than MVIC-LF (p=0.02). Significant statistical results were found when comparing MVIC-MF and MVIC (p=0.03), but not for MVIC and MVIC-LF (p=0.52).

Conclusion: Maximum voluntary isometric contraction associated with medium-frequency electrical stimulation was more effective than other NMES conditions.
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http://dx.doi.org/10.1590/1413-785220182605178164DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6220661PMC
January 2018

Low-level laser therapy on the viability of skin flap in rats subjected to deleterious effect of nicotine.

Photomed Laser Surg 2011 Aug 1;29(8):581-7. Epub 2011 Apr 1.

Department of Biomechanics, Medicine and Rehabilitation of the Locomotor System, University of São Paulo-FMRP/USP, Ribeirão Preto, Brazil.

Objective: The purpose of this study was to evaluate the effect of 830-nm laser in blocking the action of nicotine on the viability of skin flap.

Background Data: The authors have analyzed the deleterious effect of cigarette smoke or nicotine on the skin flap alone with evidence of increased skin necrosis in the flap.

Materials And Methods: Twenty-four Wistar-albino rats were divided into three groups of eight animals each: Group 1 (control), subjected to a surgical technique to obtain a flap for cranial base, laser irradiation simulation, and a subcutaneous injection of saline; Group 2, similar to Group 1, with subcutaneous injection of nicotine (2  mg/kg/day) for a period of 1 week before and 1 week after surgery; and Group 3, similar to Group 2, with skin flaps subjected to a λ 830-nm laser irradiation. The laser parameters used were: power 30 mW, beam area 0.07 cm(2), irradiance 429 mW/cm(2), irradiation time 84  sec, total energy 2.52  J, and energy density 36 J/cm(2). The laser was used immediately after surgery and for 4 consecutive days, in one point at 2.5  cm of the flap cranial base. The areas of necrosis were examined by two macroscopic analyses: paper template and Mini-Mop(®). The pervious blood vessels were also counted.

Results: The results were statistically analyzed by ANOVA and post-test contrast orthogonal method (multiple comparisons), showing that the laser decreased the area of necrosis in flaps subjected to nicotine, and consequently, increased the number of blood vessels (p < 0.05).

Conclusions: The laser proved to be an effective way to decrease the area of necrosis in rats subjected to nicotine, making them similar to the control group.
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http://dx.doi.org/10.1089/pho.2010.2883DOI Listing
August 2011

Effect of application site of low-level laser therapy in random cutaneous flap viability in rats.

Photomed Laser Surg 2009 Jun;27(3):411-6

Master of Basic Sciences in Plastic Surgery, São Paulo Federal University, São Paulo, SP, Brazil.

Objective: This study aimed to investigate the effect of diode laser (830 nm) irradiation on the viability of ischemic random skin flaps in rats, as well as to determine the most effective site for applying laser radiation to speed healing.

Background Data: Low-level laser therapy (LLLT) has recently been used to improve the viability of ischemic random skin flaps in rats.

Materials And Methods: Seventy Wistar rats were used and divided into seven groups of 10 rats each: group 1, sham laser treatment; group 2, which received irradiation at 1 point 5 cm from the flap's cranial base; group 3, which received irradiation at 2 points (5 and 7.5 cm from the flap's base); group 4, which received irradiation at 3 points (2.5, 5 and 7.5 cm from the flap's base); group 5, which received irradiation at 1 point 2.5 cm from the flap's base; group 6, which received irradiation at 2 points (2.5 and 5 cm from the flap's base); and group 7, which received irradiation at 1 point 7.5 cm from the flap's base. The animals were subjected to laser therapy at an energy density of 36 J/cm(2) for 72 sec immediately after surgery, and one time on each of the four subsequent days. The percentage of necrotic skin flap area was calculated on the seventh postoperative day using a paper template.

Results: The results showed that the rats in group 5 had the highest increase in skin flap viability, with a statistically significant difference compared to the other groups. Statistically significant differences were not seen between any of the other groups.

Conclusion: The diode laser was effective in increasing skin flap viability in rats, and laser irradiation of a point 2.5 cm from the cranial base flap was found to be the most effective.
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http://dx.doi.org/10.1089/pho.2008.2320DOI Listing
June 2009

Experimental model for low level laser therapy on ischemic random skin flap in rats.

Acta Cir Bras 2006 Jul-Aug;21(4):258-62

Post-graduation Program in Plastic Surgery, Federal University of São Paulo, Rua Napoleão de Barros, 715/4 andar, 04024-900 São Paulo, SP, Brazil.

Purpose: To develop an experimental model to be used in the study of low level Laser therapy on viability of random skin flap in rats.

Methods: The sample was 24 Wistar-EPM rats. The random skin flap measured 10 x 4 cm and a plastic sheet was interposed between the flap and donor site. Group 1 (control) underwent sham irradiation with diode laser (830 nm). Group 2 was submitted to laser irradiation with diode laser (830 nm). The animals were submitted to Laser therapy with 36 J/cm(2) energy density (72 seconds) immediately after the surgery and on the four subsequent days. The probe was usually held in contact with the skin flap surface on a point at 2.5 cm cranial from the flap base. On the seventh postoperative day, the percentage of necrotic area was measured and calculated.

Results: Group 1 reached an average necrotic area of 48.86%, Group 2 - 23.14%. After the statistic analysis, compared with the control group, Group 2 showed a statistically significant increase in survival area (p<0.001).

Conclusion: The experimental model proved to be reliable to be used in the study of effects of low level laser therapy in random skin flap in rats.
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http://dx.doi.org/10.1590/s0102-86502006000400013DOI Listing
April 2007