17th Annual ECSS-Congress, Bruges 2012

Abstract details

Abstract-ID: 1141
Session: [E-POSTER] E-Poster session ECSS Malmö 2015: 24.06. - 27.06.2015
Lecture room: E-Poster screens
Date & time: 24.06.2015 / -
Authors: Vanin, A.A., Machado, C.S.M., Antonialli, F.C., Miranda, E.F., Leal-Junior, E.C.P.
Institution: Nove de Julho University
Department: Postgraduate Program in Rehabillitation Sciences
Country: Brazil
Abstract text BACKGROUND: The effects of phototherapy have been widely studied by some research groups. Positive results were found with light application (laser and/or LED) to improve skeletal muscle performance and delay fatigue. However, there are few studies showing its’ effects on strength training. PURPOSE: To assess acute effects of phototherapy applied at different times in each session of strength training. METHODS: Thirty-six volunteers, male, healthy and physically active, were recruited. Phototherapy (with combination of super-pulsed laser, red and infrared LEDs) with dose of 30 J and/or placebo were applied before and/or after each session of strength training on quadriceps (bilaterally) according randomization (Group A: phototherapy before and after; Group B: phototherapy before and placebo after; Group C: placebo before and phototherapy after; Group D: placebo before and after). Volunteers performed leg press exercise, twice a week (72-hours interval) for 4 weeks. Strength training was performed with 80% of the maximal load defined through 1RM at baseline. This test was repeated after 4 weeks. RESULTS: Volunteers of Group A obtained an increase in the maximal load of 86.82% (±12.25%) for right leg and 80.78% (±14.11%) for left leg. In group B were found an increase of 51.09% (±16.91%) for right leg and 55.96% (±19.22%) for left leg. Group C increased 63.63% (±13.97%) for right leg and 61.55% (±13.15%) for left leg. Finally, group D enhanced only 39.15% (±11.16%) and 44.44% (±13.49%), respectively. Group A showed significant differences (p<0.05) over all experimental groups, Group C was significantly better (p<0.05) than Group B and Group D. Finally, Group B was significantly better (p<0.05) than Group D. CONCLUSION: Our results show that phototherapy irradiation before and after strength training lead to better effects than other irradiation protocols tested.
Topic: Training and Testing
Keyword I: phototherapy
Keyword II: Laser therapy
Keyword III: strength training