کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5925066 1166341 2012 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The effect of a covert manipulation of ambient temperature on heat storage and voluntary exercise intensity
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی فیزیولوژی
پیش نمایش صفحه اول مقاله
The effect of a covert manipulation of ambient temperature on heat storage and voluntary exercise intensity
چکیده انگلیسی

The modulation of sub-maximal voluntary exercise intensity during heat stress has been suggested as a behavioral response to maintain homeostasis; however, the relationship between thermophysiological cues and the associated response remains unclear. Awareness of an environmental manipulation may influence anticipatory planning before the start of exercise, making it difficult to isolate the dynamic integration of thermophysiological afferents during exercise itself. The purpose of the present study was to examine the direct real-time relationship between thermophysiological afferents and the behavioral response of voluntary exercise intensity. Participants were tasked with cycling at a constant rating of perceived exertion while ambient temperature (Ta) was covertly changed from 20 °C to 35 °C and then back to 20 °C at 20-minute intervals. Overall, power output (PO) and heat storage, quantified using repeated measures ANOVA, changed significantly over 20-minute intervals (135 ± 39 W, 133 ± 46 W, 120 ± 45 W; 52.35 ± 36.15 W·m− 2, 66.34 ± 22.02 W·m− 2, − 66.53 ± 56.01 W·m− 2). The synchronicity of PO fluctuations with changes in thermophysiological status was quantified using Auto-Regressive Integrated Moving Average (ARIMA) time series analysis. Fluctuations in PO were not synchronized in real time with changes in Ta; heat storage; rectal, skin, or mean body temperature; or sweat rate (stationary-r2 ≤ 0.10 and Ljung-Box statistic > 0.05 for all variables). We conclude that, while the thermal environment affects physiological responses and voluntary power output while cycling at a constant perceived effort, the behavioral response of voluntary exercise intensity did not depend on a direct response to real-time integration of thermal afferent inputs.

► We examine the relationship between thermal afferents and voluntary exercise intensity. ► Power output fluctuated significantly with global changes in ambient temperature. ► Power output was not synchronized in real time with changes in thermal afferents. ► Real-time integration of afferents does not influence voluntary exercise intensity.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physiology & Behavior - Volume 105, Issue 5, 20 March 2012, Pages 1194-1201
نویسندگان
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