Use of Low-level Laser Therapy (808nm) to Muscle Fatigue Resistance

Study Overview
=================
Brief Summary
-----------------
The study hypothesis is a improved muscle fatigue resistance induced by low-level laser therapy applied between sets of intense exercises.

Official Title
-----------------
Use of Low-level Laser Therapy (808nm) to Muscle Fatigue Resistance: a Randomized Double-blind Crossover Trial

Conditions
-----------------
Healthy

Intervention / Treatment
-----------------
* Device: Low-level laser therapy (808nm)
* Other: isokinetic exercise
* Device: Placebo low-level laser therapy


Participation Criteria
=================
Eligibility Criteria
-----------------
Inclusion Criteria: healthy males physically active aged between 18-28 years old Exclusion Criteria: smoker under medicine lower limb lesions limiting the flexion-extension of the knee joint

Ages Eligible for Study
-----------------
Minimum Age: 18 Years
Maximum Age: 28 Years

Sexes Eligible for Study
-----------------
Male

Accepts Healthy Volunteers
-----------------
No

Study Plan
=================
How is the study designed?
-----------------

Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: Triple


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Active Comparator: Low-level laser therapy (LLLT)<br>Use of low-level laser therapy (LLLT) to induce a muscle fatigue resistance in intense exercises | Device: Low-level laser therapy (808nm)<br>* Use of low-level laser therapy(LLLT)or placebo-LLLT applied on quadriceps femoris muscles between sets of isokinetic knee flexion-extension exercise<br>* Other names: Laser device (808nm; 100mW; DMC®, Brazil).;Other: isokinetic exercise<br> <br> * Other names: Isokinetic knee flexion-extension exercise;|
| Active Comparator: Placebo low-level laser therapy (Placebo)<br>Use of low-level laser therapy (LLLT) placebo to induce a muscle fatigue resistance | Other: isokinetic exercise<br> <br> * Other names: Isokinetic knee flexion-extension exercise;Device: Placebo low-level laser therapy<br> <br> |

What is the study measuring?
-----------------
Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Maximum repetitions | Evaluation of maximum repetitions of knee flexion-extension in isokinetic dynamometer. Volunteers were assessed on Monday (pre evaluation - baseline), on Wednesday performed a session of exercises and on Friday were assessed again (final evaluation). | 1 week | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Median Frequency | Evaluation of median frequency by surface electromyography of quadriceps femoris muscles during maximum repetitions of knee flexion-extension in isokinetic dynamometer. Volunteers were assessed on Monday (pre evaluation - baseline), on Wednesday performed a session of exercises and on Friday were assessed again (final evaluation). | 1 week | 

 Terms related to the study
=================
Keywords Provided by Centre Hospitalier Valida
-----------------
Low-level laser therapy, Muscle fatigue resistance