LA Monica Michael B, Fukuda David H, Beyer Kyle S, Hoffman Mattan W, Miramonti Amelia A, Fragala Maren S, Stout Jeffrey R, Hoffman Jay R
College of Education and Human Performance, Institute of Exercise Physiology and Wellness, University of Central Florida, Orlando, FL, USA -
J Sports Med Phys Fitness. 2016 Oct;56(10):1093-1102. Epub 2015 Sep 1.
To test if the critical power (CP) concept can be utilized to determine the critical rest interval (CRI) using repeated sprint ability (RSA) testing with varying work-to-rest ratios.
Twelve recreationally trained men (mean±SD; age 24.1±3.6 years) completed a graded exercise test and three RSA protocols with 6-second maximal sprints and varying rest intervals (12-36 s) on a cycle ergometer to determine CRI. Intermittent critical power (ICP) was calculated through the linear total work (TW) and time-to-exhaustion (TTE) relationship, whereas CRI was estimated using average work per sprint and ICP. Validation trials above and below CRI were conducted to evaluate physiological response. Repeated measures analysis of variance were used to analyze variables from RSA trials and changes in blood lactate, oxygen uptake (V̇O2), heart rate (HR), peak power, and TW throughout the validation trials.
Blood lactate, average V̇O2, V̇O2peak, and heart rate were significantly greater below CRI (8.94±4.89 mmol/L, 2.05±0.36 L/min, 2.84±0.48 L/min, and 151.14±18.46 bpm, respectively) when compared to above CRI (6.56±3.45 mmol/L, 1.78±0.26 L/min, 2.61±0.43 L/min, and 138.14±17.51 bpm). Significant interactions were found between above and below CRI for minimal V̇O2 response and maximal HR response, which were consistent with the heavy and severe exercise intensity domains.
The use of the work-time relationship determined from RSA testing with varying rest intervals can be used to determine CRI and may distinguish between physiological responses related to exercise intensity domains.
为了测试能否利用临界功率（CP）概念，通过使用不同工作-休息比的重复冲刺能力（RSA）测试来确定临界休息间隔（CRI）。
12名接受过休闲训练的男性（均值±标准差；年龄24.1±3.6岁）完成了一次分级运动测试以及三项RSA方案，在自行车测功仪上进行6秒最大冲刺并设置不同的休息间隔（12 - 36秒）以确定CRI。通过线性总功（TW）和力竭时间（TTE）关系计算间歇性临界功率（ICP），而CRI则使用每次冲刺的平均功率和ICP进行估算。在CRI之上和之下进行验证试验以评估生理反应。采用重复测量方差分析来分析RSA试验中的变量以及整个验证试验过程中血乳酸、摄氧量（V̇O2）、心率（HR）、峰值功率和TW的变化。
与CRI之上（分别为6.56±3.45 mmol/L、1.78±0.26 L/min、2.61±0.43 L/min和138.14±17.51次/分钟）相比，CRI之下的血乳酸、平均V̇O2、V̇O2峰值和心率显著更高（分别为8.94±4.89 mmol/L、2.05±0.36 L/min、2.84±0.48 L/min和151.14±18.46次/分钟）。在CRI之上和之下，发现了关于最小V̇O2反应和最大HR反应的显著交互作用，这与重度和极重度运动强度域一致。
利用不同休息间隔的RSA测试所确定的工作-时间关系可用于确定CRI，并可能区分与运动强度域相关的生理反应。
