Work intensity during pedal-stepping exercise determined using a stair simulator based on vertical velocity.
- VernacularTitle:階段登行を模した足踏運動の運動強度評価の問題点
- Author:
YOSHIO NAKAMURA
;
ETSUMORI ONDA
;
ISAO MURAOKA
- Publication Type:Journal Article
- Keywords:
exercise intensity;
pedal-stepping stair simulator;
oxygen uptake;
heart rate;
vertical velocity
- From:Japanese Journal of Physical Fitness and Sports Medicine
1992;41(2):246-254
- CountryJapan
- Language:Japanese
-
Abstract:
A study was conducted to ascertain the relationship between oxygen uptake (Vo2) and vertical velocity using a pedal-stepping stair simulator. Ten healthy volunteers performed fbur 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 detemined on the basis of the vertical pedal velocity, in accord with the climbingvelocity for stairs. The incremental rate was set at 0.34 W⋅kg-1 every 3 min. Heart rate and Vo2 were measured during the final minute of every stage. Both heart rate and Vo2 during SS were significantly lower than those on BE at the same level of work intensity. Regression equations between Vo2 (ml⋅kg-1⋅min-1) and velocity (v: m⋅s-1) were as follows;
pitch 80: Vo2=1.00×v+0.06
pitch 100: Vo2=0.88×v+1.58
pitch 120: Vo2=0.84×v+2.13
These equations give a lower value of Vo2 than the previous equation based on stair-climbingvelocity reported by the American College of Sports Medicine. Although the individual relationship between Vo2 and heart rate was closely linear, there was a significant effect ofexercise mode and stepping pitch. These results indicate that the work intensity of pedalstepping exercise with a stair simulator is overestimated if it is calculated based on theprevious equation for stair-climbing.
