Metabolic habituation following repeated resting cold-water immersion is not apparent during low-intensity cold-water exercise

J M Stocks, M J Patterson, D E Hyde, K D Mittleman, N A Taylor
Journal of Physiological Anthropology and Applied Human Science 2001, 20 (5): 263-7
This project examined the effects of repeated, resting cold-water immersion on metabolic heat production and core temperature defence during subsequent rest and exercising immersions. Seven males undertook 15 days of cold-water adaptation, immersed to the fourth intercostal space, with cold-water stress tests (CWST) on days 1, 8 and 15 (18.1 SD 0.1 degree C: 60 min seated, followed by 30 min cycling (1, and 90-min resting immersions (18.4 SD 0.4 degree C) on each of the intervening days. Adaptation elicited an habituated thermogenic response during the rest phase of CWST3 beyond 20 min, compared to CWST1 (P < 0.05), with oxygen consumption averaging 11.15 (+/- 0.25) and 8.61 (+/- 0.90) by 50 min, for CWST1 and CWST3, respectively. During exercise, this metabolic blunting was only apparent over the first 10-min period (60-70 min). No significant differences were observed during either the rest or exercise phases of the CWSTs for oesophageal temperature (Tes). While repeated cold-water exposures produced an habituated-thermogenic response, for an equivalent drop in Tes during rest, neither this response, nor an elevated thermogenesis, were apparent during subsequent cold-water exercise.

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