Pre-exercise led phototherapy (638 nm) prevents grip strength loss in elderly women: a double-blind randomized controlled trial

Pre-exercise led phototherapy (638 nm) prevents grip strength loss in elderly women: a double-blind randomized controlled trial

Author Matos, Areolino Pena Google Scholar
Navarro, Ricardo Scarparo Google Scholar
Lombardi, Imperio, Jr. Autor UNIFESP Google Scholar
Brugnera, Aldo, Jr. Google Scholar
Munin, Egberto Google Scholar
Villaverde, Antonio Balbin Google Scholar
Abstract BACKGROUND: LED phototherapy can attenuate muscle fatigue and accelerate muscle recovery in young persons, but little is known about photobiomodulation effects on muscle strength in the elderly. OBJECTIVE: To assess the effects of LED phototherapy on the grip strength and muscle fatigue of wrist flexors in elderly women. METHODS: Twenty-nine women were recruited and allocated to Placebo Group (PG) (n = 14) and LED Group (LG) (n = 15). Grip strength, number of resisted wrist flexion repetitions, and serum creatine kinase (CK) were measured. The subjects were irradiated with one diode (638 nm, 150 mW, 11.7 J/cm(2), 4.5 J/point) at four points on the wrist flexor muscles, and fatigue was induced by exercise using 75% of one maximum repetition (1MR). When muscle fatigue was reached, grip strength and CK were reassessed. RESULTS: In the LG, there was no intra-group difference for grip strength (N), 217.7 +/- 34.3 to 209.9 +/- 35.3 (p = 0.063) whereas in the PG, there was decrease in strength from 203.0 +/- 22.5 to 181.4 +/- 21.6 (p < 0.001). LED increased the number of repetitions by 22.0%. An increase in CK (U/L) was observed in PG in all post-fatigue periods (p = 0.003) but no difference was found in the LG (p = 0.972). CONCLUSIONS: A single application of LED before muscle fatigue induction may effectively maintain grip strength and reduce muscle fatigue and damage.
Keywords Elderly
Muscle Fatigue
Muscle Strength
Dynamometer
PhototherapyLight-Emitting-Diodes
Skeletal-Muscle Fatigue
Level Laser Therapy
Limb Blood-Flow
Mitochondrial Dysfunction
Isometric-Exercise
Handgrip Strength
Follow-Up
Irradiation
Sarcopenia
Language English
Date 2016
Published in Isokinetics And Exercise Science. Amsterdam, v. 24, n. 2, p. 83-89, 2016.
ISSN 0959-3020 (Sherpa/Romeo, impact factor)
Publisher Ios press
Extent 83-89
Origin http://dx.doi.org/10.3233/IES-150604
Access rights Closed access
Type Article
Web of Science ID WOS:000378947900001
URI http://repositorio.unifesp.br/handle/11600/49478

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