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1 School of Human Kinetics, University of Ottawa, Ottawa, Canada
2 Toxicology Graduate Program and Department of Veterinary Biomedical Sciences, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, Canada
* To whom correspondence should be addressed. E-mail: gkenny{at}uottawa.ca.
Seven male subjects performed the following 3 experimental protocols: 1) 60 min in the upright seated (URS) posture followed by 60 min in the 15° head-down tilt position (HDT); 2) 15 min of cycle ergometry at 75% of their pre-determined VO2peak followed by 60 min recovery in the URS posture; or 3) 15 min of cycle ergometry at 75% of their pre-determined VO2peak followed by 60 min recovery in the 15° HDT position. Mean skin temperature (Tsk), esophageal temperature (Tes), skin blood flow (SkBF), sweat rate, cardiac output (CO), stroke volume (SV), heart rate (HR), total peripheral resistance (TPR), and mean arterial pressure (MAP) were recorded at baseline, end exercise, 2, 5, 8, 12, 15, 20 and every 5-min until end of recovery (60-min). Without preceding exercise, HDT decreased HR and increased SV (p
0.05). During recovery after exercise, a significantly greater MAP, SV, CVC and sweat rate and a significantly lower HR were found with HDT in comparison to URS posture (p
0.05). Subsequently a significantly lower Tes was observed with HDT after 15-min of recovery onwards (p
0.05). At the end of 60-min recovery, Tes remained significantly elevated above baseline with URS (p
0.05), however Tes returned to baseline with HDT. In conclusion, extended recovery from dynamic exercise in the 15° HDT position attenuates the reduction in CVC and sweating thereby significantly increasing the rate of esophageal temperature decay compared to recovery in the URS posture.
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