Effects of Low Level Laser Therapy (808nm) on Muscle Performance of Young Women Submitted to Physical Training

Study Overview
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Brief Summary
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The study hypothesis is an increase in muscle performance and a higher aerobic adaptation of young women submitted to chronic endurance training program associated to low level laser therapy when compared to chronic aerobic training alone.

Detailed Description
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The study assessed women muscle performance in isokinetic dynamometry, ventilatory parameters such as ventilatory threshold, VO2Peak, VO2Max, Ventilation. Maximal load in cycle ergometer test (Balke's protocol), Borg Scale and Heart rate were assessed too.

Official Title
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Effects of Low Level Laser Therapy (808nm) on Muscle Performance of Young Women Submitted to Physical Training

Conditions
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Healthy

Intervention / Treatment
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* Device: Phototherapy by low level laser therapy


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: healthy young women volunteers women with a beginner or moderately trained pattern of physical activity body Mass Index (BMI) between 18 and 25kg/m2 Exclusion Criteria: previous injury to the femoral quadriceps or hamstrings muscles (within 6 months prior to study) osseous or articular disorder in the lower limbs cardiovascular system disorders or systemic disease

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

Sexes Eligible for Study
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Female

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: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Laser therapy and aerobic capacity<br>Effects of low level laser therapy on aerobic capacity of young women submitted to endurance training | Device: Phototherapy by low level laser therapy<br>* Phototherapy by low level laser therapy during 9 weeks<br>* Other names: Low level laser therapy;|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Fatigue Index of knee extensor muscles | Fatigue Index of knee extensor muscles assessed in isokinetic dynamometry. | nine weeks | 
| Ventilatory threshold | Ventilatory threshold quantified by a gas analyzer. | nine weeks | 
| VO2max | VO2max quantified by a gas analyzer. | nine weeks | 
| VO2peak | VO2peak quantified by a gas analyzer. | nine weeks | 
| Maximum load of effort on cycle ergometer (Balke's protocol). | Maximum load of effort on cycle ergometer quantified in Watts. | nine weeks | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Total work of knee extensor muscles | Total work of knee extensor muscles assessed in isokinetic dynamometry | nine weeks | 
| Peak torque of knee extensor muscles | Peak torque of knee extensor muscles assessed in isokinetic dynamometry | nine weeks | 
| Borg scale | Subjective effort perception assessed by Borg scale | nine weeks | 
| Heart rate | Heart Rate assessed by cardiac frequency meter | nine weeks | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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low level laser therapy, muscle performance, fatigue index, endurance training, ventilatory threshold, VO2Max, VO2Peak