階段登行を模した足踏運動の運動強度評価の問題点

概要

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A study was conducted to ascertain the relati onship between oxygen uptake (Vo_2) and vertical velocity using a pedal-stepping stair simulator. Ten healthy volunteers performed four kinds of graded exercise using a stair simulator (SS), whose pitches were set at 80, 100, and 120 beat・min^<-1>, and also an electrically braked bicycle ergometer (BE). Work rate on the SS was determined on the basis of the vertical pedal velocity,in accord with the climbing velocity for stairs. The incremental rate was set at 0.34 W・kg^<-1> every 3 min. Heart rate and Vo_2 were measured during the final minute of every stage. Both heart rate and Vo_2 during SS were significantly lower than those on BE at the same level of work intensity. Regression equations between Vo_2 (ml・kg^<-1>・min^<-1>) and velcity (υ : m・s^<-1>) were as follows ; pitch 80 : Vo_2 =1.00×υ+0.06 pitch 100 : Vo_2=0.88×υ+1.58 pitch 120 : Vo_2=0.84×υ+2.13 These equations give a lower value of Vo_2 than the previous equation based on stair-climbing velocity reported by the Americllege of Sports Medicine. Although the individual relationship between Vo_2 and heart rate was closely linear, there was a significant effect of exercise mode and stepping pitch. These results indicate that the work intensity of pedal-stepping exercise with a stair simulator is overestimated if it is calculated based on the previous equation for stair-climbing.
日本体力医学会の論文
1992-04-01