Effect of cluster multi-diode light emitting diode therapy (LEDT) on exercise-induced skeletal muscle fatigue and skeletal muscle recovery in humans

This paper aims to investigate the effect of light emitting diode therapy (LEDT) on exercise-induced hand muscle fatigue by measuring the surface electromyography (sEMG) of flexor digitorum superficialis. Ten healthy volunteers were randomly placed in the equal sized LEDT group and control group. All subjects performed a sustained fatiguing isometric contraction with the combination of four fingertips except thumb at 30% of maximal voluntary contraction (MVC) until exhaustion. The active LEDT or an identical passive rest therapy was then applied to flexor digitorum superficialis. Each subject was required to perform a re-fatigue task immediately after therapy which was the same as the pre-fatigue task. Average rectified value (ARV) and fractal dimension (FD) of sEMG were calculated. ARV and FD were significantly different between active LEDT and passive rest groups at 20%–50%, 70%–80%, and 100% of normalized contraction time (P<0.05). Compared to passive rest, active LEDT induced significantly smaller increase in ARV values and decrease in FD values, which shows that LEDT is effective on the recovery of muscle fatigue. Our preliminary results also suggest that ARV and FD are potential replacements of biochemical markers to assess the effects of LEDT on muscle fatigue.

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Effect of 830 nm low-level laser therapy in exercise-induced skeletal muscle fatigue in humans

Lasers in Medical Science ◽

10.1007/s10103-008-0592-9 ◽

2008 ◽

Vol 24 (3) ◽

pp. 425-431 ◽

Cited By ~ 107

Author(s):

Ernesto Cesar Pinto Leal Junior ◽

Rodrigo Álvaro Brandão Lopes-Martins ◽

Adriane Aver Vanin ◽

Bruno Manfredini Baroni ◽

Douglas Grosselli ◽

...

Keyword(s):

Skeletal Muscle ◽

Muscle Fatigue ◽

Laser Therapy ◽

Low Level Laser Therapy ◽

Skeletal Muscle Fatigue ◽

Low Level ◽

Low Level Laser ◽

Level Laser ◽

Exercise Induced

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Effects of Low-Level Laser Therapy (LLLT) in the Development of Exercise-Induced Skeletal Muscle Fatigue and Changes in Biochemical Markers Related to Postexercise Recovery

Journal of Orthopaedic and Sports Physical Therapy ◽

10.2519/jospt.2010.3294 ◽

2010 ◽

Vol 40 (8) ◽

pp. 524-532 ◽

Cited By ~ 129

Author(s):

Ernesto Cesar Pinto Leal ◽

Rodrigo ÁLvaro BrandÃo Lopes-Martins ◽

Lucio Frigo ◽

Thiago De Marchi ◽

Rafael Paolo Rossi ◽

...

Keyword(s):

Skeletal Muscle ◽

Muscle Fatigue ◽

Laser Therapy ◽

Biochemical Markers ◽

Low Level Laser Therapy ◽

Skeletal Muscle Fatigue ◽

Low Level Laser ◽

Level Laser ◽

Postexercise Recovery ◽

Exercise Induced

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Effect of 808 nm low-level laser therapy in exercise-induced skeletal muscle fatigue in elderly women

Lasers in Medical Science ◽

10.1007/s10103-012-1246-5 ◽

2013 ◽

Vol 28 (5) ◽

pp. 1375-1382 ◽

Cited By ~ 51

Author(s):

Renata Luri Toma ◽

Helga Tatiana Tucci ◽

Hanna Karen Moreira Antunes ◽

Cristiane Rodrigues Pedroni ◽

Anamaria Siriani de Oliveira ◽

...

Keyword(s):

Skeletal Muscle ◽

Muscle Fatigue ◽

Laser Therapy ◽

Elderly Women ◽

Low Level Laser Therapy ◽

Skeletal Muscle Fatigue ◽

Low Level ◽

Low Level Laser ◽

Level Laser ◽

Exercise Induced

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Effect of 655-nm Low-Level Laser Therapy on Exercise-Induced Skeletal Muscle Fatigue in Humans

Photomedicine and Laser Surgery ◽

10.1089/pho.2007.2160 ◽

2008 ◽

Vol 26 (5) ◽

pp. 419-424 ◽

Cited By ~ 124

Author(s):

Ernesto Cesar Pinto Leal Junior ◽

Rodrigo Álvaro Brandão Lopes-Martins ◽

Francis Dalan ◽

Maurício Ferrari ◽

Fernando Montanari Sbabo ◽

...

Keyword(s):

Skeletal Muscle ◽

Muscle Fatigue ◽

Laser Therapy ◽

Low Level Laser Therapy ◽

Skeletal Muscle Fatigue ◽

Low Level ◽

Low Level Laser ◽

Level Laser ◽

Exercise Induced

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Human muscle fatigue after glycogen depletion: a 31P magnetic resonance study

Journal of Applied Physiology ◽

10.1152/jappl.1992.73.1.75 ◽

1992 ◽

Vol 73 (1) ◽

pp. 75-81 ◽

Cited By ~ 12

Author(s):

L. A. Bertocci ◽

J. L. Fleckenstein ◽

J. Antonio

Keyword(s):

Skeletal Muscle ◽

Magnetic Resonance ◽

Muscle Fatigue ◽

High Energy ◽

Resonance Spectroscopy ◽

High Energy Phosphates ◽

Handgrip Exercise ◽

Glycogen Depletion ◽

Skeletal Muscle Fatigue ◽

Exercise Induced

To differentiate the effects of high energy phosphates, pH, and [H2PO4-] on skeletal muscle fatigue, intracellular acidosis during handgrip exercise was attenuated by prolonged submaximal exercise. Healthy human subjects (n = 6) performed 5-min bouts of maximal rhythmic handgrip (RHG) before (CONTROL) and after prolonged (60-min) handgrip exercise (ATTEN-EX) designed to attenuate lactic acidosis in active muscle by partially depleting muscle glycogen. Concentrations of free intracellular phosphocreatine ([PCr]), adenosine triphosphate ([ATP]), and orthophosphate ([P(i)]) and pH were measured by 31P nuclear magnetic resonance spectroscopy and used to calculate adenosine diphosphate [ADP], [H2PO4-], and [HPO4(2-)]. Handgrip force output was measured with a dynamometer, and fatigue was determined by loss of maximal contractile force. After ATTEN-EX, the normal exercise-induced muscle acidosis was reduced. At peak CONTROL RHG, pH fell to 6.3 +/- 0.1 (SE) and muscle fatigue was correlated with [PCr] (r = 0.83), [P(i)] (r = 0.82), and [H2PO4-] (r = 0.81); [ADP] was 22.0 +/- 5.7 mumol/kg. At peak RHG after ATTEN-EX, pH was 6.9 +/- 0.1 and [ADP] was 116.1 +/- 18.2 mumol/kg, although [PCr] and [P(i)] were not different from CONTROL RHG (P greater than 0.05). After ATTEN-EX, fatigue correlated most closely with [ADP] (r = 0.84). The data indicate that skeletal muscle fatigue 1) is multifactorial, 2) can occur without decreased pH or increased [H2PO4-], and 3) is correlated with [ADP] after exercise-induced glycogen depletion.

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