Influence of exercise training with thigh compression on heat‐loss responses. (June 2015)

• Record Type: Journal Article
• Authors: Amano, T.; Inoue, Y.; Koga, S.; Nishiyasu, T.; Kondo, N.
• Is Part Of: Scandinavian journal of medicine & science in sports. Volume 25(2015)Supplement 1
• Page Start: 173
• Page End: 182
• Publication Date: 2015-06
• Subjects: Heat adaptation -- thermoregulation -- Kaatsu training -- ischemic training; Sports medicine -- Periodicals; Sports -- Physiological aspects -- Periodicals; Sports -- Periodicals; 617.1027
• DOI: 10.1111/sms.12365
• Languages: English
• ISSNs: 0905-7188

Abstract

Abstract : We investigated the effect of thigh compression, which accelerates activation of central command and muscle metabo‐ and mechanoreceptors, on the adaptation of sweating and cutaneous vascular responses during exercise heat acclimation. Nine non‐heat‐acclimated male subjects were acclimated to heat (32 °C and 50% RH) while cycling [50% of maximum oxygen uptake ( V ˙ O 2 m a x )] 60 min/day for 7 days (control group). The experimental group ( n = 9) conducted the same training while the proximal thighs were compressed by a cuff at 60 mmHg. V ˙ O 2 m a x, acetylcholine‐induced forearm sweating rate (iontophoresis), and mean sweating and cutaneous vascular responses on the forehead, chest, and forearm (SRmean and CVCmean ) during passive heating were evaluated before and after training. Training significantly increased V ˙ O 2 m a x while did not affect acetylcholine‐induced sweating rates in either group. Training significantly decreased T b thresholds for SRmean and CVCmean during passive heating without the alternations of sensitivities in both groups. Although SRmean during passive heating at a given Δ T b was not improved in either group, CVCmean was significantly ( P < 0.05) attenuated after exercise training only in experimental group. Our results indicate that thigh cuff compression during exercise heat acclimation does not influence adaptation of the sweating response but attenuate cutaneous vasodilation.