Forearm blood flow during leg exercise was well accounted for by a linear combination of esophageal and mean skin temperatures, independent of exercise intensity.
How do internal and skin temperatures during leg exercise affect forearm blood flow?
Forearm blood flow during exercise is primarily determined by internal and skin temperatures rather than exercise intensity per se.
Subjects exercised for 30 min on a bicycle ergometer at 30, 50, and 70% of maximal aerobic power in ambient temperatures of 15, 25, and 35 degrees C and vapor pressures of less than 18 Torr. Exercise was used to vary internal temperature during an experiment, and different ambient temperatures were used to vary skin temperatures independently of internal temperature. Forearm skin temperature was fixed at about 36.5 degrees C. Esophageal temperature (Tes) was measured with a thermocouple at the level of the left atrium, and mean skin temperature (Tsk) was calculated from a weighted mean of thermocouple temperatures at eight skin sites. Forearm blood flow (BF) was measured by electrocapacitance plethysmography. Our data are well accounted for by an equation of the form BF = a1Tes + q2Tsk + b, independent of exercise intensity, although some subjects showed an equivocal vasodilator effect of exercise. The ratios a1/a2 (7.5, 9.6, 11.7) are quite similar to the ratios (8.6, 10.4) of the corresponding coefficients in two recent models of thermoregulatory sweating.
Wenger et al. (Wed,) reported a other. Leg exercise on a bicycle ergometer was evaluated on Forearm blood flow. Forearm blood flow during leg exercise was well accounted for by a linear combination of esophageal and mean skin temperatures, independent of exercise intensity.