Abstract
Purpose
The purpose of this study was to investigate the effects of photobiomodulation therapy (PBMT) combined with resistance training on knee extensors muscle mass, strength and functional capacity in elderly men.
Methods
In this randomized double-blinded placebo-controlled trial, healthy elderly men (age 60–80 years) completed 12 weeks of resistance training (2×/week) with application of placebo (n = 13) or active PBMT (n = 11) on quadriceps muscles (850 nm, 240 J per limb) before each training session. Leg press and knee extension one-repetition maximum (1RM) tests, isometric and concentric peak torques, rectus femoris (RF) and vastus lateralis (VL) muscle thickness, timed up-and-go (TUG) and chair rise-to-standing (CRS) tests were performed before and after the intervention period.
Results
There were significant improvements in all outcomes for both groups (p < 0.05), except for RF muscle thickness for the placebo group (p = 0.09). Large effect sizes (ES > 0.8) were observed for leg press and leg extension 1RM and CRS tests for both groups, as well as for TUG test for PBMT group. Isokinetic peak torque for both groups and TUG for placebo group had moderate increases (ES > 0.5). Muscle thicknesses and isometric peak torque had small increases (ES > 0.2) in both groups. Both null hypothesis analysis and magnitude-based inference support similar effects of PBMT and placebo treatments.
Conclusion
Different than previously evidenced in young subjects, PBMT with the parameters used in this study did not provide any additional benefits in comparison to placebo application on muscle mass, strength and functional capacity of healthy elderly men engaged in a resistance training program.
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Abbreviations
- 1RM:
-
One-repetition maximum
- ATP:
-
Adenosine triphosphate
- CRS:
-
Chair rise-to-standing
- ICC:
-
Intraclass correlation coefficient
- J:
-
Joules
- PBMT:
-
Photobiomodulation therapy
- RF:
-
Rectus femoris
- TUG:
-
Timed up-and-go
- VL:
-
Vastus lateralis
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Acknowledgements
The authors want to thank CAPES and CNPq for the scholarships provided.
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The authors declare that no funding was received for the development of the study.
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Communicated by William J. Kraemer.
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Fritsch, C.G., Dornelles, M.P., Teodoro, J.L. et al. Effects of photobiomodulation therapy associated with resistance training in elderly men: a randomized double-blinded placebo-controlled trial. Eur J Appl Physiol 119, 279–289 (2019). https://doi.org/10.1007/s00421-018-4023-8
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DOI: https://doi.org/10.1007/s00421-018-4023-8