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Introduction: The effects of Low Level Laser Therapy (LLLT) on exercise-induced muscular damage have been studied over the last years. Studies have been conducted on animals and humans in order to try to show the benefits of the intervention, but there is still conflicting evidence about its protective and therapeutic effects.
Objectives: To describe the effects of LLLT on pain, strength and muscular inflammation after plyometric exercise.
Methods: A randomized, double-blinded, placebo-controlled trial with participation of 20 male healthy volunteers will be performed. Healthy and physically active individuals, aged between 18 and 35 years, with no history of injury on the lower limbs or contra-indications to maximal exercise performance will be included. A protocol of 10 series with 10 repetitions of the countermovement jump will be used to induce muscle damage at the lower limbs. Immediately before or after the exercise protocol, LLLT will be applied on one lower limb, while the other will receive placebo treatment. Phototherapy will be applied with an equipment of 810nm and a cluster with 5 diodes on 8 different points of the knee extensor muscle, totalizing a dosage of 240J. The placebo treatment will be held on the same way, but the equipment will be turned off. The volunteers will be evaluated at baseline (before the exercise protocol) and at follow-up of 24, 48 and 72 hours. The following outcomes will be evaluated: knee extensors isometric peak torque by Isokinetic Dynamometer, pain by Visual Analogue Scale and muscular tissue echo intensity by Ultrasonography.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| LLLT before muscle damage | Experimental | Low Level Laser Therapy (LLLT) will be applied before the exercise protocol on one lower limb, while the other will receive placebo treatment. Phototherapy will be applied with an equipment of 810nm and a cluster with five diodes on eight different points of quadriceps muscle, totalizing a dosage of 240J. |
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| Placebo LLLT before muscle damage | Placebo Comparator | Placebo LLLT will be applied before the exercise protocol on one lower limb, while the other will receive real treatment. Placebo treatment will also be applied on eight different points of quadriceps muscle, but the equipment will be turned off. |
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| LLLT after muscle damage | Active Comparator | Low Level Laser Therapy (LLLT) will be applied after the exercise protocol on one lower limb, while the other will receive placebo treatment. Phototherapy will be applied with an equipment of 810nm and a cluster with five diodes on eight different points of quadriceps muscle, totalizing a dosage of 240J. |
|
| Placebo LLLT after muscle damage | Placebo Comparator | Placebo LLLT will be applied after the exercise protocol on one lower limb, while the other will receive real treatment. Placebo treatment will also be applied on eight different points of quadriceps muscle, but the equipment will be turned off. |
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| LLLT before muscle damage | Device |
| ||
| Placebo LLLT before muscle damage |
| Measure | Description | Time Frame |
|---|---|---|
| Knee extensors isometric peak torque (Nm) | Isokinetic Dynamometer | Baseline and 24, 48 and 72 hours follow-up |
| Measure | Description | Time Frame |
|---|---|---|
| Knee extensors soreness (Visual Analogue scale) | Baseline and 24, 48 and 72 hours follow-up | |
| Knee extensors echo intensity (number of white and black pixels) | Baseline and 24, 48 and 72 hours follow-up |
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Inclusion Criteria:
Exclusion Criteria:
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| Name | Affiliation | Role |
|---|---|---|
| Bruno Baroni, phD | Federal University of Health Science of Porto Alegre | Study Director |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Federal University of Health Science of Porto Alegre | Porto Alegre | Rio Grande do Sul | 90050-170 | Brazil |
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| Device |
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| LLLT after muscle damage | Device |
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| Placebo LLLT after muscle damage | Device |
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