caa a22 4500 467939845 CHVBK 20180406153009.0 cr unu---uuuuu 170328e20060901xx s 000 0 eng 10.1007/s00421-006-0249-y doi (NATIONALLICENCE)springer-10.1007/s00421-006-0249-y Body cooling attenuates the decrease in maximal oxygen uptake associated with cardiovascular drift during heat stress [Elektronische Daten] [Jonathan Wingo, Kirk Cureton] Previous research suggests cardiovascular drift (CV drift) is associated with decreased maximal oxygen uptake $$\left( \dot{\hbox{V}}\hbox{O}_{\rm 2max} \right)$$ during heat stress, but more research manipulating CV drift with subsequent measurement of $$\dot{\hbox{V}}\hbox{O}_{\rm 2max}$$ is needed to assess whether this relationship is causal. To assess causation, $$\dot{\hbox{V}}\hbox{O}_{\rm 2max}$$ was measured during the same time interval that CV drift occurred (between 15 and 45min of submaximal exercise under different conditions of body cooling intended to manipulate CV drift). Ten men completed a control graded exercise test (GXT) in 22°C to measure $$\dot{\hbox{V}}\hbox{O}_{\rm 2max},$$ then on separate occasions they cycled in 35°C at 60% $$\dot{\hbox{V}}\hbox{O}_{\rm 2max}$$ for 15min (15max), 45min with no cooling (NC), and 45min with fan airflow (FAN) beginning at ∼18min into exercise, and each bout was immediately followed by a GXT to measure $$\dot{\hbox{V}}\hbox{O}_{\rm 2max}. $$ In NC, $$ \dot{\hbox{V}}\hbox{O}_{\rm 2max} $$ decreased 18%, heart rate (HR) increased 16%, and stroke volume (SV) fell 12% (P<0.05) from min 15 to min 45. In FAN, $$\dot{\hbox{V}}\hbox{O}_{\rm 2max}$$ fell less (5.7%, P<0.05) , HR rose less (4%, P<0.05) and SV decreased less (3%, P<0.05) from 15 to 45min. The fall in $$\dot{\hbox{V}}\hbox{O}_{\rm 2max}$$ associated with CV drift during exercise in a hot environment is attenuated with body cooling via fan airflow. The findings support the notion that a causal link exists between CV drift that occurs during prolonged exercise in a hot environment and a decrease in $$\dot{\hbox{V}}\hbox{O}_{\rm 2max}.$$ Springer-Verlag, 2006 Thermoregulation nationallicence Heart rate nationallicence Stroke volume nationallicence Circulation nationallicence $$\dot{\hbox{V}}\hbox{O}_{\rm 2max}$$ nationallicence Wingo Jonathan Department of Kinesiology, University of Georgia, 300 River Road, 30602-6554, Athens, GA, USA aut Cureton Kirk Department of Kinesiology, University of Georgia, 300 River Road, 30602-6554, Athens, GA, USA aut European Journal of Applied Physiology Springer-Verlag 98/1(2006-09-01), 97-104 1439-6319 98:1<97 2006 98 421 https://doi.org/10.1007/s00421-006-0249-y text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00421-006-0249-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Wingo Jonathan Department of Kinesiology, University of Georgia, 300 River Road, 30602-6554, Athens, GA, USA aut NATIONALLICENCE 700 1- Cureton Kirk Department of Kinesiology, University of Georgia, 300 River Road, 30602-6554, Athens, GA, USA aut NATIONALLICENCE 773 0- European Journal of Applied Physiology Springer-Verlag 98/1(2006-09-01), 97-104 1439-6319 98:1<97 2006 98 421 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer