多段階負荷運動時の外耳道温の変化

Relationship between temperature of external auditory canal (Te) and work rate (W), oxygen intake (VO2), heart rate (HR), and blood lactate concentration (La), which were obtained during pedaling exercise with stepwise incremental load method, were examined in twenty healthy male students. The first load was 30 watts and then load was increased by 30 watts every 3 minutes until 240 watts as a maximal load. Te was measured at a place of about 1.5 cm inside of external auditory canal. V02, HR, and La were determined during last 30 seconds in each load. Te was almost constant at the loads from the first to 3rd-5th load, and after that increased rapidly. This showed a breaking point in the relations between Te and W, V02, and HR. The mean values of W, V02, and HR at the breaking point were 94.5 (SD, 24.38) watts， 19.1 (3.14) ml/kg/min, and 109.9 (10.82) beats/min, respectively. However, there was a significant positive relationship between Te and La. These results indicated that some metabolites like La and C02, which relate to blood vessel dilatation. will affect on the change in Te during exercise.