Six weeks of localized heat therapy does not affect muscle mass, strength and contractile properties in healthy active h

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ORIGINAL ARTICLE

Six weeks of localized heat therapy does not affect muscle mass, strength and contractile properties in healthy active humans Mariem Labidi1,2 · Mohammed Ihsan1,3 · Fearghal P. Behan1,4 · Marine Alhammoud5 · Tessa Smith6 · Mohamed Mohamed6 · Claire Tourny2 · Sébastien Racinais1  Received: 23 August 2020 / Accepted: 27 October 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020

Abstract Purpose  Animal and human studies have shown that repeated heating may induce skeletal muscle adaptations, increasing muscle strength. The aim of this study is to investigate the effect of 6 weeks of localized heating on skeletal muscle strength, volume and contractile properties in healthy humans. Methods  Fifteen active participants (8 males/7 females, 35 ± 6 years, 70 ± 14 kg, 173 ± 7 cm, average training of 87 min per week) were subjected to 6 weeks of single-leg heat therapy. Heat pads were applied for 8 h/day, 5 days/week, on one randomly selected calf of each participant, while the contralateral leg acted as control. The heat pads increased muscle temperature by 4.6 ± 1.2 °C (p