Shannon O, Barlow M, Duckworth L, Woods D R, Barker T, Grindrod A, Griffiths A, O'Hara J P
Institute for Sport, Physical Activity and Leisure, Leeds Beckett University, Carnegie Faculty, Headingley Campus, Headingley, Leeds, United Kingdom of Great Britain and Northern Ireland.
Department of Vascular Surgery, Royal Stoke University Hospital, Newcastle Road, Stoke on Trent, United Kingdom of Great Britain and Northern Ireland.
Int J Sports Med. 2016 Sep;37(10):825-30. doi: 10.1055/s-0042-108651. Epub 2016 Jun 23.
The purpose of this study was to assess the reliability of a pre-loaded 1 500-m treadmill time trial, conducted in moderate normobaric hypoxia. 8 trained runners/triathletes (24±3 years, 73.2±8.1 kg, 182.5±6.5 cm, altitude specific V˙O2max: 52.9±5.5 ml·kg(-1)·min(-1)) completed 3 trials (the first as a familiarisation), involving 2, 15-min running bouts at 45% and 65% V˙O2max, respectively, and a 1 500-m time trial in moderate normobaric hypoxia equivalent to a simulated altitude of 2 500 m (FiO2~15%). Heart rate, arterial oxygen saturation, skeletal muscle and cerebral tissue oxygenation (StO2), expired gas ( V˙O2 and V˙CO2), and ratings of perceived exertion were monitored. Running performance (Trial 1: 352.7±40; Trial 2: 353.9±38.2 s) demonstrated a low CV (0.9%) and high ICC (1). All physiological variables demonstrated a global CV≤4.2%, and ICC≥0.87, with the exception of muscle (CV 10.4%; ICC 0.70) and cerebral (CV 4.1%; ICC 0.82) StO2. These data demonstrate good reliability of the majority of physiological variables and indicate that a pre-loaded 1 500-m time trial conducted in moderate normobaric hypoxia is a highly reliable test of performance.
本研究的目的是评估在中度常压缺氧环境下进行的预负荷1500米跑步机计时赛的可靠性。8名训练有素的跑步运动员/铁人三项运动员（年龄24±3岁，体重73.2±8.1千克，身高182.5±6.5厘米，特定海拔的最大摄氧量：52.9±5.5毫升·千克⁻¹·分钟⁻¹）完成了3次测试（第一次为适应性测试），包括分别在45%和65%最大摄氧量下进行2次15分钟的跑步，以及在相当于模拟海拔2500米（吸入氧分数~15%）的中度常压缺氧环境下进行一次1500米计时赛。监测心率、动脉血氧饱和度、骨骼肌和脑组织氧合（组织氧饱和度）、呼出气体（摄氧量和二氧化碳排出量）以及主观用力程度分级。跑步成绩（第一次测试：352.7±40秒；第二次测试：353.9±38.2秒）显示变异系数较低（0.9%），组内相关系数较高（1）。除肌肉（变异系数10.4%；组内相关系数0.70）和脑（变异系数4.1%；组内相关系数0.82）组织氧饱和度外，所有生理变量的总体变异系数≤4.2%，组内相关系数≥0.87。这些数据表明大多数生理变量具有良好的可靠性，并表明在中度常压缺氧环境下进行的预负荷1500米计时赛是一种高度可靠的运动能力测试。
