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1 School of Human Kinetics, University of Ottawa, Ottawa, Ontario, Canada
* To whom correspondence should be addressed. E-mail: gkenny{at}uottawa.ca.
The purpose of the study was to examine the effect of 1) Passive (assisted pedaling), 2) Active (loadless pedaling); and, 3) Inactive (motionless) recovery modes on mean arterial pressure (MAP), skin blood flow (SkBF) and sweating during recovery after 15 minutes of dynamic exercise. It was hypothesized that an active recovery mode would be most effective in attenuating the fall in MAP, SkBF and sweating during exercise recovery. Six male subjects performed 15-min of cycle ergometer exercise at 70% of their predetermined VO2peak followed by 15 minutes of 1) Active, 2) Passive or 3) Inactive recovery. Mean skin temperature (Tsk), esophageal temperature (Tes), SkBF, sweating, cardiac output (CO), stroke volume (SV), heart rate (HR), total peripheral resistance (TPR), and MAP were recorded at baseline, end exercise, 2, 5, 8, 12, and 15-min postexercise. Cutaneous vascular conductance (CVC) was calculated as the ratio of laser-Doppler blood flow to MAP. In the active and passive recovery modes, CVC, sweat rate, MAP, CO and SV remained elevated over inactive values (P<0.05). The passive mode was equally effective as the active mode in maintaining CO, SV, MAP, CVC and sweat rate above inactive recovery. Sweat rate was different between all modes after 8-mins of recovery (P<0.05). TPR during active recovery remained significantly lower than during recovery in the passive and inactive modes (P<0.05). No differences in either Tes or Tsk were observed among conditions. Given that MAP was higher during passive and active recovery modes than during inactive recovery suggests differences in CVC may be due to differences in baroreceptor unloading and not factors attributed to central command. However, differences in sweat rate may be influenced by factors such as central command and mechanoreceptor stimulation.
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