Fischer Gabriela, Figueiredo Pedro, Ardigò Luca P
School of Exercise and Sport Science, University of Verona, Verona, Italy.
Int J Sports Physiol Perform. 2015 Nov;10(8):965-71. doi: 10.1123/ijspp.2014-0429. Epub 2015 Mar 10.
To investigate physiological performance determinants of the partial laps and an overall 22-km handbiking (HB) time trial in athletes with high paraplegia.
Seven male HB athletes with spinal cord injury (lesion levels thoracic 2-8) performed a laboratory maximal incremental test under cardiorespiratory-mechanical monitoring including respiratory-exchange ratio (RER), oxygen uptake (VO2), and mechanical power output (PO). Individual first and second ventilatory thresholds (VO 2VT1 and VO 2VT2), VO 2peak, and PO peak were posteriorly identified. Athletes also performed a simulated HB time trial along a 4-lap bike circuit under cardiorespiratory measurement. Overall metabolic cost (C) and %VO 2peak (ratio of VO2 to VO 2peak) were calculated from race data. Race performance was defined as mean race velocity (v).
athletes completed the 22-km HB time trial in 45 ± 6 min, at 29.9 ± 3.6 km/h, with %VO 2peak = 0.86 ± 0.10 and RER = 1.07 ± 0.17. VO 2peak (r = .89, P = .01), POpeak (r = .85, P = .02), VO 2VT1 (r = .96, P = .001), VO 2VT2 (r = .92, P = .003), and C (2nd lap, r = .78; 3rd lap, r = .80; and 4th lap, r = .80) were significantly (P < .05) positively correlated with race performance. Within-subjects correlation coefficient revealed a large and significant (r = .68, P < .001) relationship between %VO 2peak and v.
VO 2peak, PO peak, ventilatory thresholds, %VO 2peak, and C appeared to be important physiological performance determinants of HB time trial.
研究高位截瘫运动员进行部分圈次及全程22公里手摇自行车（HB）计时赛的生理性能决定因素。
七名男性脊髓损伤的HB运动员（损伤平面为胸2 - 8）在心肺-机械监测下进行实验室最大递增测试，包括呼吸交换率（RER）、摄氧量（VO₂）和机械功率输出（PO）。随后确定个体的第一和第二通气阈值（VO₂VT1和VO₂VT2）、VO₂峰值和PO峰值。运动员还在心肺测量下沿着4圈自行车赛道进行模拟HB计时赛。根据比赛数据计算总体代谢成本（C）和%VO₂峰值（VO₂与VO₂峰值的比值）。比赛成绩定义为平均比赛速度（v）。
运动员完成22公里HB计时赛用时45±6分钟，速度为29.9±3.6公里/小时，%VO₂峰值=0.86±0.10，RER = 1.07±0.17。VO₂峰值（r = 0.89，P = 0.01）、PO峰值（r = 0.85，P = 0.02）、VO₂VT1（r = 0.96，P = 0.001）、VO₂VT2（r = 0.92，P = 0.003）和C（第2圈，r = 0.78；第3圈，r = 0.80；第4圈，r = 0.80）与比赛成绩显著正相关（P < 0.05）。受试者内相关系数显示%VO₂峰值与v之间存在大且显著（r = 0.68，P < 0.001）的关系。
VO₂峰值、PO峰值、通气阈值、%VO₂峰值和C似乎是HB计时赛重要的生理性能决定因素。
