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

Status

Completed

Phases

Phase 1

Study type

Interventional

Source

ClinicalTrials.gov

Registry ID

NCT01391195

Enrollment

Registered

2011-07-11

Start date

2006-01-31

Completion date

2007-10-31

Last updated

2011-07-13

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Healthy

Keywords

low level laser therapy, muscle performance, fatigue index, endurance training, ventilatory threshold, VO2Max, VO2Peak

Brief summary

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

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.

Interventions

DEVICEPhototherapy by low level laser therapy

Phototherapy by low level laser therapy during 9 weeks

Study design

Allocation

RANDOMIZED

Intervention model

PARALLEL

Primary purpose

TREATMENT

Masking

NONE

Eligibility

Sex/Gender

FEMALE

Age

18 Years to 28 Years

Healthy volunteers

Yes

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

Design outcomes

Primary

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

Secondary

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

Countries

Brazil

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Feb 4, 2026