Abstract：
Purpose: Despite the accuracy of heart rate (HR) as an indicator of the aerobic engagement has been evaluated in several intermittent on-court activities, its validity as an oxygen uptake (V˙O2) indicator during shuttle running over short paths remains uncertain. Moreover, it is unclear whether speed may affect such validity. This study evaluated the HR ability in estimating the V˙O2 during 5-m shuttle running at different speeds. Methods: V˙O2 and HR of 12 physically active young men were recorded during an incremental forward running (FW) protocol and a 5-m shuttle test at 50%, 60%, and 75% of maximal aerobic speed (MAS). Slope and intercept of the relationship between HR and V˙O2 (HR/V˙O2) were individually determined, in both protocols. The HR measured during the shuttle test was used in the FW HR/V˙O2 to estimate V˙O2 at each shuttle speed. A paired Student\'s t-test compared slopes and intercepts of the two HR/V˙O2. A two-way RM-ANOVA and an equality test examined, respectively, the differences and the equality between measured and estimated V˙O2. Lastly, a Bland-Altman plot described the accuracy and precision of the estimated V˙O2 at each shuttle intensity. Results: Slopes and intercepts of the HR/V˙O2 appeared not different between FW and shuttle running. At 50%MAS, HR underestimated the V˙O2 (~7%), whereas returned accurate values at the two higher velocities, although with high variability (±18%). Conclusions: When using HR as V˙O2 indicator during shuttle running over short paths, a separated analysis of the HR validity as V˙O2 indicator is recommended especially when administering different exercise intensities.
摘要：
目的：尽管心率（HR）作为有氧参与的指标的准确性已经在几个间歇性的球场上活动中进行了评估，在短路径上运行的航天飞机中，其作为摄氧量（V•O2）指标的有效性仍不确定。此外，目前尚不清楚速度是否会影响这种有效性。这项研究评估了在以不同速度运行的5米航天飞机中估算V•O2的HR能力。方法：在增量向前跑（FW）方案和50％的5米穿梭试验中，记录了12名身体活跃的年轻男性的V-O2和HR，60%,和最大有氧速度（MAS）的75％。分别确定HR与V·O2（HR/V·O2）之间关系的斜率和截距，在这两个协议中。在FWHR/V•O2中使用在穿梭测试期间测量的HR来估算每个穿梭速度下的V•O2。配对的Student\'st检验比较了两个HR/V•O2的斜率和截距。检验了双向RM-ANOVA和相等性检验，分别,测量的和估计的V·O2之间的差异和相等性。最后,Bland-Altman图描述了在每个穿梭强度下估计的V•O2的准确性和精度。结果：FW和穿梭之间的HR/V•O2的斜率和截距似乎没有差异。在50%MAS时，HR低估了V＊O2(~7%)，而在两个较高的速度下返回准确的值，尽管具有高变异性（±18％）。结论：当使用HR作为V-O2指标时，穿梭在短路径上运行，建议对HR有效性进行单独分析，作为V•O2指标，尤其是在进行不同的运动强度时。
