Perception of effort during high-intensity exercise at low,moderate and high wet bulb globe temperatures |
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Authors: | Stephen C Glass Ronald G Knowlton M Daniel Becque |
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Institution: | (1) Exercise Physiology Laboratory, Department of Physical Education, Southern Illinois University, 62901 Carbondale, IL, USA;(2) Human Performance Laboratory, Division of Human Performance and Leisure Studies, Wayne State College, 68787 Wayne, NE, USA |
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Abstract: | The purpose of this study was to determine the effect of low, moderate and high wet bulb globe temperatures (T
wbg) on cardiovascular variables and ratings of perceived exertion (RPE) during moderately prolonged, high-intensity exercise. Six subjects four men and two women; mean (SD) age, 22.0 (1.2) years; maximum oxygen consumption ({ie519-1}), 51.0 (8.4) ml · kg–1 · min–1] completed 30 min of exercise (80% {ie519-2}) on a cycle ergometer at low 14.7 (2.1)°C], moderate 21.0 (1.5)° C], and high 27.4 (2.3)° C]T
wbg. Two additional subjects completed 20 min of exercise in the high temperature condition, but completed 30 min in the moderate and lowT
wbg. Heart rate (f
c), blood pressure, blood lactate (La), mean skin temperature (
sk),
, and RPE were measured at 10, 20 and 30 min. Results showed thatf
c, rate pressure product, RPE, pulmonary ventilation and ventilatory equivalent for oxygen increased (P < 0.05) across time for all conditions, while
decreased across time.
sk andf
c were significantly greater across time in the high condition 35.9 (0.65)° C; 176 (12.6) beats · min–1] compared to the moderate 34.6 (1.5)° C; 170 (17.2) beats · min–1] and the low condition 31.7 (1.5)° C; 164 (17.1) beats-min–1]. However, there were no differences throughout exercise in RPE high,.16.2 (2.0); moderate, 16.4 (2.2); low, 16.3 (1.9)] and
across the conditions. These data suggest that RPE is closely related to metabolic intensity but is not a valid indicator of cardiovascular strain during exercise in highT
wbg conditions. |
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