Effect of Light Emitting Diode Therapy on Muscle Fatigue

Study Overview
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Brief Summary
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The purpose of this study is to determine the optimal time interval between light emitting diode application and exercise to improve fatigue resistance.The results of this study could be useful in planning a rehabilitation program in musculature disorders and also in athletic training.

Detailed Description
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To determine the effect of light emitting diode applied 5 minutes before exercise on pain, rate of perceived exertion and maximum voluntary contraction. To determine the effect of light emitting diode applied 1 hour before exercise on pain, rate of perceived exertion and maximum voluntary contraction. To determine the effect of light emitting diode applied 5 hours before exercise on pain, rate of perceived exertion and maximum voluntary contraction. To determine the difference between light emitting diode applied 5 minutes,1 hour or 5 hours before exercise on pain, rate of perceived exertion and maximum voluntary contraction.

Official Title
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Effect of Different Pre Application Time Intervals of Light Emitting Diode Therapy on Muscle

Conditions
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Muscle Fatigue

Intervention / Treatment
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* Device: Light emitting diode


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Healthy non athletics subjects. Age ranges from 20-40 years. Body mass index is less than 25 kg/m 2 Exclusion Criteria: Neurological deficit and recent injury to either upper extremity non diagnosed pain . Contraindications to LED irradiation (such as light hypersensitivity, fluctuating blood pressure, insufficient blood circulation, fever and inflammation of the skin) Conditions in which physical exertion is contraindicated (such as cardiovascular deficits, hypertension and respiratory problems) Restriction in shoulder or elbow range of motion; Neoplasm, Rheumatoid, Strength training in the past 6 months; Previous surgery in the spine or upper extremity; Complaints of pain in the shoulder, elbow,wrist, and trunk musculature system; Use of dietary supplements; and not in any other exercise program for at least the past 3 months.

Ages Eligible for Study
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Minimum Age: 20 Years
Maximum Age: 40 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Prevention
Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: Single


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: 5 minutes before 1<br>Light emitting diode applied 5 minutes before fatiguing task | Device: Light emitting diode<br>* Light emitting diode at a wavelength of 890 nm is produced by an array of 60 gallium aluminum arsenide light-emitting diodes located on flexible pads and the near infrared photo energy is delivered in a noninvasive, drug-free manner<br>|
| Placebo Comparator: 5 minutes before 2<br>Light emitting diode applied 5 minutes before fatiguing task | Device: Light emitting diode<br>* Light emitting diode at a wavelength of 890 nm is produced by an array of 60 gallium aluminum arsenide light-emitting diodes located on flexible pads and the near infrared photo energy is delivered in a noninvasive, drug-free manner<br>|
| Experimental: 1 hour before 1<br>Light emitting diode applied 1 hour before fatiguing task | Device: Light emitting diode<br>* Light emitting diode at a wavelength of 890 nm is produced by an array of 60 gallium aluminum arsenide light-emitting diodes located on flexible pads and the near infrared photo energy is delivered in a noninvasive, drug-free manner<br>|
| Placebo Comparator: 1 hour before 2<br>Light emitting diode applied 1 hour before fatiguing task | Device: Light emitting diode<br>* Light emitting diode at a wavelength of 890 nm is produced by an array of 60 gallium aluminum arsenide light-emitting diodes located on flexible pads and the near infrared photo energy is delivered in a noninvasive, drug-free manner<br>|
| Experimental: 5 hours before 1<br>Light emitting diode applied 5 hours before fatiguing task | Device: Light emitting diode<br>* Light emitting diode at a wavelength of 890 nm is produced by an array of 60 gallium aluminum arsenide light-emitting diodes located on flexible pads and the near infrared photo energy is delivered in a noninvasive, drug-free manner<br>|
| Placebo Comparator: 5 hours before 2<br>Light emitting diode applied 5 hours before fatiguing task | Device: Light emitting diode<br>* Light emitting diode at a wavelength of 890 nm is produced by an array of 60 gallium aluminum arsenide light-emitting diodes located on flexible pads and the near infrared photo energy is delivered in a noninvasive, drug-free manner<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Isometric peak torque of elbow flexors | metric unit is Newton | change from before light emitting diode application at 5 minutes, 1 hour and 5 hours | 
| Isometric peak torque of elbow flexors | metric unit is Newton | change from before light emitting diode application at1 minute | 
| Isokinetic peak torque of elbow flexors | Metric unit is Newton and at angular velocity 60 | change from before light emitting diode application at 5 minutes, 1 hour and 5 hours | 
| Isokinetic peak torque of elbow flexors | Metric unit is Newton and at angular velocity 60 | change from before light emitting diode application at 1 minute after light emitting diode application |