Revisiting ventilatory and cardiovascular predictions of whole-body metabolic rate.
OBJECTIVE
The influence of variations in exercise mode, thermal state, and load carriage on cardiac and ventilatory predictors of metabolic rate were investigated.


METHODS
Fifteen males were studied at rest and during whole-, upper-, and lower-body exercise (unloaded and loaded) under thermoneutral and hot conditions.


RESULTS
Ventilatory predictions were superior in thermoneutral (residual mean square error range: 0.04 to 0.17 L·min(-1) vs 0.21 to 0.36 L·min(-1)) and hot conditions (0.03 to 0.07 L·min(-1) vs 0.21 to 0.24 L·min(-1)). Predictions derived from whole- or lower-body exercise, and unloaded or loaded exercise could be interchanged without significant error. Nevertheless, a mode-specific prediction was required for upper-body work, and mild hyperthermia significantly reduced the precision of cardiac predictions.


CONCLUSIONS
Ventilatory predictions were more precise, but errors from heart-rate predictions could be minimized by using thermal-state and exercise mode-specific predictions.
From the Centre for Human and Applied Physiology, School of Medicine, University of Wollongong, Wollongong, New South Wales, Australia.
Sean R
SR
Notley
Hugh H K
HH
Fullagar
Daniel S
DS
Lee
Mayumi
M
Matsuda-Nakamura
Gregory E
GE
Peoples
Nigel A S
NA
Taylor
D015415:Biomarkers / Q000378:metabolism; D001831:Body Temperature; D002245:Carbon Dioxide / Q000378:metabolism; D004734:Energy Metabolism / Q000502:physiology*; D015444:Exercise / Q000502:physiology*; D005080:Exercise Test; D006339:Heart Rate; D006358:Hot Temperature; D006801:Humans; D008297:Male; D010101:Oxygen Consumption; D005082:Physical Exertion; D012123:Pulmonary Ventilation / Q000502:physiology*; D012146:Rest; D016474:Weight-Bearing; D055815:Young Adult
D015415:Biomarkers; D002245:Carbon Dioxide