Facial cooling does not benefit cardiac dynamics during recovery from exercise hyperthermia.
Cardiovascular responses during passive recovery following exercise-induced hyperthermia were investigated in male subjects (n = 8) on two separate occasions; once with facial cooling (FC; 2 degrees C, 2.5 m/s) and once without (NC). Recovery heart rate (HR) responses were significantly (p less than 0.05) lower during the FC than NC condition. No statistical differences were observed between groups with respect to stroke volume (SV), cardiac output (CO), systemic vascular resistance (SVR), and mean arterial blood pressure (MAP). After 5 min of recovery, FC caused a significant (p less than 0.05) reduction in HR however, the NC group response remained unchanged. The decline in HR with FC was moderately associated with the decrease in forehead temperature (r = 0.69; p less than 0.05) but poorly correlated with rectal temperature (r = 0.09; p greater than 0.05). As expected, SV, CO, and MAP significantly declined (p less than 0.05) while the estimated SVR progressively increased (p less than 0.05) over time. The results suggest that FC is not beneficial in terms of improving central and peripheral cardiovascular dynamics during recovery from exercise-induced hyperthermia.
Kilgour
R D
RD
Department of Exercise Science, Concordia University, Montreal, Quebec, Canada.
Gariepy
P
P
Rehel
R
R
D000328:Adult; D001831:Body Temperature / Q000502:physiology*; D003080:Cold Temperature; D015444:Exercise / Q000502:physiology*; D005145:Face; D006339:Heart Rate / Q000502:physiology*; D006439:Hemodynamics / Q000502:physiology; D006801:Humans; D008297:Male; D012016:Reference Values; D014655:Vascular Resistance / Q000502:physiology