Laser Therapy on Neuromuscular Performance

Objective: Investigating the immediate effects of Low Level Laser Therapy (LLLT) on neuromuscular performance in healthy subjects after an induced muscle fatigue protocol. Methods: Eighty volunteers of both genders aged between 18 and 28 years underwent a preliminary evaluation using surface electromyography and isokinetic dynamometer of the flexor muscles of the elbow. The subjects were randomly allocated into 4 groups: G1 was control group; G2 placebo; G3 laser applied before fatigue protocol; and G4 immediately after. Muscular fatigue protocol consisted of 30 maximal concentric isokinetic contractions at 120°/s of the elbow flexor muscles. An 808 nm equipment was used for applying laser therapy, with a power of 100 mW and total energy of 20 J. Volunteers were reassessed after interventions.

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Key information

Conditions

Fatigue Pathological Conditions, Signs and Symptoms Signs and Symptoms

Age range

18 year–28 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

Federal University of Rio Grande do Norte

Natal, Rio Grande do Norte, 59140-840, Brazil

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

Being between 18-28 years of age, having no pain in the shoulder area, elbow or hand, and not having suffered any to injury to the assessed upper limb in the last six months.

Exclusion criteria

Presenting pain that prevented the completion of the evaluation, subjects whose data were improperly recorded or if the volunteer withdrew from the study.

Treatment and study plan

Low Level Laser Therapy

Device

Low Level Laser Therapy was applied at four points to the dominant upper limb of the volunteers on the muscle belly of the biceps. Delineation was done using a measuring tape from the elbow joint line to the acromion marked at points corresponding to 20%, 30%, 40% and 50% of this distance, focusing the application on the muscle belly region, thereby excluding the tendinous region.

An 808 nm equipment was used for applying laser therapy, with a power of 100 mW and total energy of 20 J.

Placebo Laser

Device

Laser application simulation with a second pen of the laser device, which was disconnected and did not effectively irradiate energy.

Primary outcomes

Peak torque normalized by body weight

Time frame: Change from baseline to one hour.

Sponsors and collaborators

Lead sponsor

Universidade Federal do Rio Grande do Norte

Other

Registry information

Official study title

Immediate Effects of Low-level Laser Therapy (808nm) on Neuromuscular Performance After Muscle Fatigue: Randomized-blinded Clinical Trial

Important dates

Study start: 2014
Primary completion: 2015
Study completion: 2015
First posted: Jun 27, 2016
Registry last updated: Jun 27, 2016

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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