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European Journal of Applied Physiology

, Volume 115, Issue 3, pp 639–647 | Cite as

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

  • Bruno Manfredini Baroni
  • Rodrigo Rodrigues
  • Bruno Bolla Freire
  • Rodrigo de Azevedo Franke
  • Jeam Marcel Geremia
  • Marco Aurélio Vaz
Original Article

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.

Keywords

Phototherapy Resistance training Eccentric exercise Quadriceps femoris 

Abbreviations

ANOVA

Analysis of variance

CG

Control group

LEDT

Light-emitting diode therapy

LLLT

Low-level laser therapy

MTRF

Rectus femoris muscle thickness

MTVL

Vastus lateralis muscle thickness

MTVM

Vastus medialis muscle thickness

PTCON

Concentric peak torque

PTECC

Eccentric peak torque

PTISO

Isometric peak torque

RF

Rectus femoris

TG

Training group

TLG

Training + LLLT group

VI

Vastus intermedius

VL

Vastus lateralis

VM

Vastus medialis

ΣMT

Sum of muscles’ thicknesses

Notes

Acknowledgments

The authors would like to thank Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq, Brazil) and Fundação de Amparo a Pesquisa do Estado do Rio Grande do Sul (FAPERGS, Brazil) for financial support.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Bruno Manfredini Baroni
    • 1
    • 2
  • Rodrigo Rodrigues
    • 2
  • Bruno Bolla Freire
    • 2
  • Rodrigo de Azevedo Franke
    • 2
  • Jeam Marcel Geremia
    • 2
  • Marco Aurélio Vaz
    • 2
  1. 1.Universidade Federal de Ciências da Saúde de Porto AlegrePorto AlegreBrazil
  2. 2.Universidade Federal do Rio Grande do SulPorto AlegreBrazil

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