The effect of warming-up exercise on the respiratory and circulatory responses, i. e., Vo₂max VE and HR, to an incremental exercise to exhaustion was investigated in track and field athletes.
　We employed four experimental conditions to obtain the relationship between body temperatures and respiro-circulatory responses ;
　1 ) face fanning during submaximal (50% Vo₂max) prolonged exercise using the cycle-ergometer.
　2 ) warming-up running prior to the incremental treadmill-running, at the fixed intensity of 40%Vo₂max for 12 min.
　3 ) warming-up running at the conditioned intensity under the subject's experience and body condition.
　4 ) comparison in the change of body temperatures induced by the warming-up between in the experimental condition and in the actual field condition.
　Obtained results were as follows :
　1 ) The cycling exercise with face fanning was done with low values of Vo₂, HR, VE and RR compared to the exercise with non face fanning. It could not be seen the significant difference in the temperature change in rectal temperature (Trect) and skin temperature at the thigh, but tympanic temperature (Tty) decreased / increased during exercise with / without face fanning, respectively.
　2 ) With the warming-up running at the fixed exercise intensity, Trect and mean skin temperature (Ts) increased 0.2 degrees and Tty decreased 0.2 degrees. However, we failed to find any favorable effect of hyperthermia caused by warming-up exercise on Vo₂max, VE, HR and RR.
　3 ) When the subject was requested to warm-up prior to the incremental exercise test at the intensity which was decided by his experience, the intensity was in the range between 50 and 68% Vo₂max, and the duration was from 9 to 19 min. All subjects showed the increment in Trect and mean body temperature (Tb). There could be seen no relationship between the intensity and the change in body temperatures. During incremental exercise test after warming-up, all subjects showed low value in VE and RR compared to the test without warming-up.
　4 ) To obtain the body temperature changes in the actual warming-up exercise at the track and field, the subject was requested to warm-up similar to the warming-up in the actual competition. The measured (Trect and Tty) and calculated (Ts and Tb) body temperatures after the warming-up showed considerable increase compared with the data which was obtained from the warm-up in the room.

DESCENTE SPORTS SCIENCE Vol.15/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE