Department of Kinesiology, East Carolina State University, Greenville, NC, USA.
Department of Health Science, Rocky Mountain University of Health Professions, 122 East 1700 South, Provo, UT, 84606, USA.
Eur J Appl Physiol. 2018 Sep;118(9):1781-1787. doi: 10.1007/s00421-018-3908-x. Epub 2018 Jun 8.
A customized submaximal exercise test for cycle ergometry was reported as a superior estimate of maximum oxygen uptake (VO) in comparison to the traditional YMCA ergometry test.
Following similar methodology, we sought to validate a customized submaximal treadmill test (CustomTM) compared with the widely used Bruce submaximal protocol.
Participants (29 women and 21 men; age = 31.37 ± 11.44 year, BMI = 24.02 ± 3.03) performed a graded exercise test (GXT) with a subsequent exhaustive, square-wave bout for the verification of "true" VO. In counterbalanced order, subjects then completed submaximal protocols. The CustomTM protocol consisted of two 3-min stages estimated at 35 and 70% of VO, where VO was estimated with a linear regression equation utilizing sex, BMI, age, and self-reported physical activity.
VO values from the GXT and verification bout were 47.2 ± 7.7 and 47.0 ± 7.7 ml kg min, respectively (ICC = 0.99, CV = 2.0%, TE = 0.83 ml kg min), with the highest value used as "true" VO (47.7 ± 7.7 ml kg min). Neither the Bruce (45.95 ± 6.97 ml kg min) nor the CustomTM (47.3 ± 9.4 ml kg min) protocol differed from "true" VO. The CustomTM had a "very large" measurement agreement with "true" VO (ICC = 0.78, CV of 9.1%, TE = 4.07 ml kg min). Bruce had a "large" measurement agreement with "true" VO (ICC = 0.62, CV of 10.0%, TE = 4.51 ml kg min).
The CustomTM was superior to the Bruce protocol, because it included a stage below and above gas exchange threshold, yielded a better measurement agreement for "true" VO, and was more time efficient.
与传统的 YMCA 测功计相比，针对自行车测功计的定制亚极量运动测试被报道为最大摄氧量（VO）的更好估计。
我们遵循类似的方法，旨在验证定制亚极量跑步机测试（CustomTM）与广泛使用的 Bruce 亚极量方案相比的有效性。
参与者（29 名女性和 21 名男性；年龄=31.37±11.44 岁，BMI=24.02±3.03）进行了分级运动测试（GXT），随后进行了耗竭性的方波回合，以验证“真实”VO。以平衡方式，参与者随后完成了亚极量方案。CustomTM 方案由两个 3 分钟的阶段组成，估计为 VO 的 35%和 70%，其中 VO 是通过利用性别、BMI、年龄和自我报告的体力活动的线性回归方程进行估计的。
GXT 和验证回合的 VO 值分别为 47.2±7.7 和 47.0±7.7 ml kg min（ICC=0.99，CV=2.0%，TE=0.83 ml kg min），使用最高值作为“真实”VO（47.7±7.7 ml kg min）。Bruce（45.95±6.97 ml kg min）和 CustomTM（47.3±9.4 ml kg min）方案均与“真实”VO 无差异。CustomTM 与“真实”VO 的测量一致性“非常大”（ICC=0.78，CV 为 9.1%，TE=4.07 ml kg min）。Bruce 与“真实”VO 的测量一致性“大”（ICC=0.62，CV 为 10.0%，TE=4.51 ml kg min）。
CustomTM 优于 Bruce 方案，因为它包含了低于和高于气体交换阈值的阶段，为“真实”VO 产生了更好的测量一致性，并且更有效率。
