In summary, the results of the current study indicated that paraplegics were able to sustain a significantly higher percentage of their peak V02 and peak HR during a SR lasting approximately 14 min when compared to quadriplegics. The WV during the SR and TR were not significantly related to the peak V02 in either group of subjects. Significant relationships were observed between the SR and TR for the race time VV, HR, and [La] responses in quadriplegics and paraplegics, suggesting that the SR was a valid measure of racing performance in SCI subjects