Responses of subjects with spinal cord injuries to maximal wheelchair exercise: comparison of discontinuous and continuous protocols

Autor: Rasche, Walther, Janssen, Thomas W. J., Oers, Cornelia A. J. M., Hollander, A. Peter, Woude, Luc H. V.
Zdroj: European Journal of Applied Physiology; April 1993, Vol. 66 Issue: 4 p328-331, 4p
Abstrakt: Six male subjects with spinal cord injuries (SCI) participated in this investigation to compare peak values of oxygen uptake ( $$\dot V$$ O2). heart rate (fc), ventilation ( $$\dot V$$ E), respiratory exchange ratio (R) and power output (W) obtained using a discontinuous (DP) and a continuous jump max protocol (JMP) in a maximal wheelchair exercise test on a treadmill. The W increments were achieved by imposing an extra mass upon the wheelchair through a pulley system. The DP involved exercise periods of 3 min separated by 2-min intervals at relative rest. Increments in W consisted of 0.10 or 0.15 W · kg-1 total mass. During the rest intervals no mass was imposed on the wheelchair. The JMP involved an increase in W each minute. Increments and velocity in the JMP were the same as during the exercise periods for DP. Mean peak values for W [99.5 (SD 13.6) W], $$\dot V$$ O2 [2.13 (SD 0.27) l · min-1, standard temperature and pressure, dry], R [1.25 (SD 0.16)] and $$\dot V$$ E [82.8 (SD 11.2) l · min-1, body temperature and pressure, saturated] in DP were not different from values observed for W [103.5 (SD 13.1)], $$\dot V$$ O2 [2.18 (SD 0.31) l · min-1], R [1.17 (SD 0.16)] and $$\dot V$$ E [78.9 (SD 16.0) l · min-1] in the JMP. The only significant difference was observed for fc: 198 (SD 11) beats · min-1 in DP and 187 (SD 11) beats · min-1 in JMP. The higher values for fc elicited using DP have been discussed. It was concluded that both a DP and a JMP seem to be equally appropriate in determining peak $$\dot V$$ O2 and peak W in SCI persons. In terms of time saving, JMP would seem to be a more favourable protocol.
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