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The purpose of this study was to determine whether maximal oxygen uptake (JOURNAL/mespex/beta/00005768-199109000-00018/ENTITY_OV0312/v/2017-05-02T160619Z/r/image-pngO2max) is protocol dependent during arm cycle ergometry (ACE) for quadriplegic males with spinal cord injuries (SCI). Twenty- four non-ambulatory subjects (aged 20–38 yr) with cervical SCI were divided into two groups based on wheelchair sports classification (IA group = 14; IB/IC group = 10). They underwent three different, continuous graded exercise tests spaced at least 1 wk apart on an electronically braked arm cycle ergometer. Following a 3-min, unloaded warm-up at 60 rpm, the work rate was increased 2, 4, or 6 W·min−1 for the IA group and 4, 6, or 8 W·min−1 for the IB/IC group. Ventilation and gas exchange were measured breath-by-breath with a SensorMedics 4400 computerized system. Repeated-measures ANOVA showed no significant difference among the three protocols for JOURNAL/mespex/beta/00005768-199109000-00018/ENTITY_OV0312/v/2017-05-02T160619Z/r/image-pngO2max, in the IA group (P > 0.05). The mean (±SD) JOURNAL/mespex/beta/00005768-199109000-00018/ENTITY_OV0312/v/2017-05-02T160619Z/r/image-pngO2max values (ml·kg−1·min−1) were 10.8 (±3.4), 11.0 (±2.7), and 10.2 (± 2.9) for the 2, 4, and 6 W·min−1 protocols, respectively. In contrast, the IB/IC group showed a significant difference among the protocols for JOURNAL/mespex/beta/00005768-199109000-00018/ENTITY_OV0312/v/2017-05-02T160619Z/r/image-pngO2max (P < 0.05). The mean (±SD) JOURNAL/mespex/beta/00005768-199109000-00018/ENTITY_OV0312/v/2017-05-02T160619Z/r/image-pngO2max values (ml·kg−1. min−1) were 16.8 (±4.5), 15.3 (±4.3), and 14.6 (±4.3) for 4, 6, and 8 W·min−1, respectively. Post hoc analysis revealed a difference between the 4 and 8 W · min−1 protocols. Our results suggest that graded exercise testing of SCI persons with quadriplegia, using ACE, should employ work rate increments between 2–6 W·min−1 and that work rate increments of 8 W·min−1 or greater will underestimate JOURNAL/mespex/beta/00005768-199109000-00018/ENTITY_OV0312/v/2017-05-02T160619Z/r/image-pngO2max. |
