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Effect of low-level laser therapy on muscle adaptation to knee extensor eccentric training.

Abstract：

PURPOSE:Eccentric training has been popularized for physical conditioning and prevention/rehabilitation of musculoskeletal disorders, especially due to the expressive responses in terms of muscular strength gain. In view of evidence that low-level laser therapy (LLLT) is able to increase exercise performance and accelerate post-exercise recovery, the aim of this study was to verify the effect of LLLT on hypertrophy and strengthening of knee extensor muscles submitted to eccentric training. METHOD:Thirty healthy male subjects were randomized into three groups: Control Group (CG), Training Group (TG) and Training + LLLT Group (TLG). CG received no intervention, while TG and TLG were engaged on an 8-week knee extensor isokinetic eccentric training program. Only subjects from TLG were treated with LLLT (wavelength = 810 nm; power output = 200 mW; total dosage = 240 J) before each training session. Knee extensor muscle thickness and peak torque were assessed through ultrasonography and isokinetic dynamometry, respectively. RESULTS:CG presented no changes in any variable throughout the study, while eccentric training led to significant increases in muscle thickness and peak torque in TG and TLG. Subjects from TLG reached significantly higher percent changes compared to subjects from TG for sum of muscles' thicknesses (15.4 vs. 9.4%), isometric peak torque (20.5 vs. 13.7%), and eccentric peak torque (32.2 vs. 20.0%). CONCLUSION:LLLT applied before eccentric training sessions seems to improve the hypertrophic response and muscular strength gain in healthy subjects.

journal_name

Eur J Appl Physiol

journal_title

European journal of applied physiology

authors

Baroni BM,Rodrigues R,Freire BB,Franke Rde A,Geremia JM,Vaz MA

doi

10.1007/s00421-014-3055-y

subject

Has Abstract

pub_date

2015-03-01 00:00:00

pages

639-47

issue

3

eissn

1439-6319

issn

1439-6327

journal_volume

115

pub_type

杂志文章,随机对照试验

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