EFFECTS OF LIGHT-EMITTING DIODE THERAPY ON THE PERFORMANCE OF BICEPS BRACHII MUSCLE OF YOUNG HEALTHY MALES AFTER 8 WEEKS OF STRENGTH TRAINING: A RANDOMIZED CONTROLLED CLINICAL TRIAL

Author(s)

Vieira, Kamila V. S. G. ^[1] ; Ciol, Marcia A. ^[2] ; Azevedo, Paulo H. ^[3] ; Pinfildi, Carlos E. ^[1] ; Renno, Ana C. M. ^[4] ; Colantonio, Emilson ^[1] ; Tucci, Helga T. ^[1]

Affiliation

^[1] Univ Fed Sao Paulo, Dept Human Movement Sci, Campus Baixada Santista, Sao Paulo - Brazil

^[2] Univ Washington, Dept Rehabil Med, Campus Seattle, Seattle, WA 98195 - USA

^[3] Univ Fed Sao Paulo, Grad Program Human Movement Sci, Dept Human Movement Sci, Sao Paulo - Brazil

^[4] Univ Fed Sao Paulo, Dept Biosci, Campus Baixada Santista, Sao Paulo - Brazil

• Document type: Journal article
• Source: JOURNAL OF STRENGTH AND CONDITIONING RESEARCH; v. 33, n. 2, p. 433-442, FEB 2019.
• Web of Science Citations: 1

Abstract

We assessed the effect of adding light-emitting diode therapy (LEDT) to an 8-week strength training of biceps brachii in healthy young males. Forty-five participants were randomized into training plus LEDT, training plus sham LEDT, and control groups (n = 15 each). Individuals in the LEDT groups participated in strength training performed in a Scott machine at their maximum number of elbow flexion-extension repetitions. The LEDT was applied to biceps brachii of dominant limb at the end of training sessions (device ``on{''} for LEDT and ``off{''} for sham LEDT). Training loads were re-evaluated every 2 weeks. Controls did not receive training during 8 weeks. All groups were evaluated for 1 repetition maximum (1RM) and fatigue at baseline and 8 weeks. Additionally, the 2 LEDT groups were evaluated every 2 weeks for 1-RM and number of elbow flexion-extension repetitions. The groups were statistically different in mean difference and mean percent change of 1-RM from baseline to week 8 (p = 0.001). Analyzing the 2 LEDT groups, we found an interaction between group and time (p = 0.02), with a slightly faster increase in 1-RM for the LEDT than the sham LEDT. Over time, both groups decreased the number of repetitions of elbow flexion-extension (differences not statistically significant), possibly because of the increase of load over time. We found no difference in change of fatigue index among the 3 groups. Our study showed potential benefits to 1RM when LEDT is applied after a strength training session. Future studies might assess whether different doses of LEDT can reduce fatigue in strength training. (AU)

• FAPESP's process: 13/24567-0 - Effects of low level laser therapy in the electromyography activy of biceps brachii muscle in young males during a resistive training program
• Grantee: Kamila Verlene Soares Gomes Vieira
• Support Opportunities: Scholarships in Brazil - Scientific Initiation