Mündel Toby, Gilmour Simon, Kruger Marlena, Thomson Jasmine
School of Sport Exercise and Nutrition, Massey University, Palmerston North, New Zealand.
Fonterra Research and Development Centre, Palmerston North, New Zealand.
Temperature (Austin). 2022 Nov 11;10(3):279-286. doi: 10.1080/23328940.2022.2143168. eCollection 2023.
We determined the reliability of a 60-min treadmill protocol in the heat when spaced >4 weeks apart, longer than the test-retest duration of 1 week found in the literature. Nine unacclimated, trained males (age: 31 ± 8 y; VOpeak: 60 ± 6 ml∙kg∙min) undertook a 15 min self-paced time-trial pre-loaded with 45 min of running at 70% of individual ventilatory threshold (11.2 ± 0.3 km∙h) in 30 ± 1°C (53 ± 5% relative humidity). They repeated this following 40 ± 14 and 76 ± 26 days, with pre-trial standardization of diet and exercise for 48 h. When considering trial 1 as a familiarization, change in core temperature (∆T) during the first 45 min (∆2.0 ± 0.2°C) between trials 2 and 3 yielded bias and 95% limits of agreement (LoA) of -0.10 ± 0.43°C, standard error of measurement (SEM) of 0.13°C and intraclass correlation coefficient (ICC) of 0.75, more reliable than measures of baseline T (36.9 ± 0.2°C; LoA: -0.23 ± 0.90°C; SEM: 0.22°C; ICC: 0.03) and T at 45 min during exercise (38.9 ± 0.4°C; LoA: 0.32 ± 1.12°C; SEM: 0.28°C; ICC: 0.15). The coefficient of variation (CV) between trials 2 and 3 for distance run during the 15 min time-trial was 2.1 ± 2.0% with LoA of 0.001 ± 0.253 km and SEM of 0.037 km. This protocol is reliable spaced ~5 weeks apart when considering the most commonly accepted limit of <5% CV for performance, reinforced by reliability of the ΔT being 0.1 ± 0.4°C.
我们确定了在高温环境下，间隔超过4周（长于文献中发现的1周重测时长）的60分钟跑步机测试方案的可靠性。9名未经适应训练的男性（年龄：31±8岁；峰值摄氧量：60±6毫升·千克·分钟）在30±1°C（相对湿度53±5%）的环境下，先进行了15分钟的自定节奏计时赛，赛前有45分钟以个人通气阈值的70%（11.2±0.3千米·小时）进行跑步预负荷。在40±14天和76±26天后重复此项测试，赛前48小时进行饮食和运动的标准化。将第一次测试视为适应性测试，第二次和第三次测试前45分钟的核心温度变化（∆T）（∆2.0±0.2°C）得出的偏差和95%一致性界限（LoA）为-0.10±0.43°C，测量标准误差（SEM）为0.13°C，组内相关系数（ICC）为0.75，比基线体温测量值（36.9±0.2°C；LoA：-0.23±0.90°C；SEM：0.22°C；ICC：0.03）以及运动45分钟时的体温测量值（38.9±0.4°C；LoA：0.32±1.12°C；SEM：0.28°C；ICC：0.15）更可靠。在15分钟计时赛中，第二次和第三次测试之间跑步距离的变异系数（CV）为2.1±2.0%，LoA为0.001±0.253千米，SEM为0.037千米。考虑到性能方面最常接受的CV<5%的界限，以及∆T可靠性为0.1±0.4°C，该方案间隔约5周时是可靠的。
