Pain reduction by infrared light-emitting diode irradiation: a pilot study on experimentally induced delayed-onset muscle soreness in humans

Lasers in Medical Science
Elke VinckDirk Cambier

Abstract

The present pilot study investigated the analgesic efficacy of light-emitting diode (LED). In view of a standardised and controlled pain reduction study design, this in vivo trial was conducted on experimentally induced delayed-onset muscle soreness (DOMS). Thirty-two eligible human volunteers were randomly assigned to either an experimental (n=16) or placebo group (n=16). Immediately following the induction of muscle soreness, perceived pain was measured by means of a visual analog scale (VAS), followed by a more objective mechanical pain threshold (MPT) measurement and finally an eccentric/concentric isokinetic peak torque (IPT) assessment. The experimental group was treated with infrared LED at one of both arms, the other arm served as control. Irradiation lasted 6 min at a continuous power output of 160 mW, resulting in an energy density of 3.2 J/cm(2). The subjects of the placebo group received sham irradiation at both sides. In post-treatment, a second daily assessment of MPT and VAS took place. The treatment and assessment procedure (MPT, VAS and IPT) was performed during 4 consecutive days. Statistical analysis (a general linear model followed by post hoc least significant difference) revealed no apparent significant an...Continue Reading

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Citations

Jan 31, 2012·Photomedicine and Laser Surgery·Maria Emília de Abreu ChavesLeandro Soares Oliveira
Feb 3, 2012·Journal of Visualized Experiments : JoVE·Hani H Al-NakhliLee S Berk
Feb 3, 2015·Journal of Physical Therapy Science·Carolina Marciela HerpichDaniela Aparecida Biasotto-Gonzalez
Apr 30, 2013·Photonics & Lasers in Medicine·Cleber FerraresiNivaldo A Parizotto
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Aug 9, 2021·Physical Therapy in Sport : Official Journal of the Association of Chartered Physiotherapists in Sports Medicine·Roberto Lohn NahonAníbal Monteiro de Magalhães Neto

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