van den Tillaar Roland, von Heimburg Erna, Solli Guro Strøm
Int J Sports Physiol Perform. 2020 Sep 15;15(9):1334-1339. doi: 10.1123/ijspp.2019-0843. Print 2020 Oct 1.
To compare the assessment of the maximal oxygen consumption (VO2max) in a traditional graded exercise test (GXT) with a 1-km self-paced running test on a nonmotorized treadmill in men and women.
A total of 24 sport-science students (12 women: age 23.7 [7.7] y, body height 1.68 [0.02] m, body mass 66.6 [4.3] kg; 12 men: 22.1 [3.1] y, body height 1.82 [0.06] m, body mass 75.6 [11.0] kg) performed a traditional GXT on a motorized treadmill and a 1-km self-paced running test on a nonmotorized treadmill. VO2max, blood lactate, heart rate, and rating of perceived exertion, together with running velocity and duration at each test, were measured.
The main findings of the study were that the 1-km test produced significantly higher VO2max values (53.2 [9.9] vs 51.8 [8.8] mL/kg/min ) and blood lactate concentrations (11.9 [1.8] vs 11.1 [2.2] mmol/L) than the GXT (F ≥ 4.8, P ≤ .04, η2 ≥ .18). However, after controlling for sex, these differences were only present in men (60.6 [8.1] vs 58.1 [8.0] mL/kg/min , P = .027). Peak running velocity was higher in the GXT than in the 1-km test (15.7 [2.7] vs 13.0 [2.8] km/h). Men had higher VO2max values and running velocities than women in both tests. However, men and women used approximately similar pacing strategies during the 1-km test.
Higher VO2max values were observed in a 1-km self-paced test than in the GXT. This indicates that a 1-km running test performed on a nonmotorized treadmill could serve as a simple and sport-specific alternative for the assessment of VO2max.
比较传统分级运动试验（GXT）与非电动跑步机上1公里自定步速跑步试验对男性和女性最大摄氧量（VO2max）的评估。
共有24名体育科学专业学生（12名女性：年龄23.7[7.7]岁，身高1.68[0.02]米，体重66.6[4.3]千克；12名男性：22.1[3.1]岁，身高1.82[0.06]米，体重75.6[11.0]千克）在电动跑步机上进行传统GXT，并在非电动跑步机上进行1公里自定步速跑步试验。测量VO2max、血乳酸、心率、主观用力程度分级，以及每次试验的跑步速度和持续时间。
该研究的主要发现是，1公里试验产生的VO2max值（53.2[9.9]对51.8[8.8]毫升/千克/分钟）和血乳酸浓度（11.9[1.8]对11.1[2.2]毫摩尔/升）显著高于GXT（F≥4.8，P≤.04，η2≥.18）。然而，在控制性别后，这些差异仅在男性中存在（60.6[8.1]对58.1[8.0]毫升/千克/分钟，P =.027）。GXT中的峰值跑步速度高于1公里试验（15.7[2.7]对13.0[2.8]公里/小时）。在两项试验中，男性的VO2max值和跑步速度均高于女性。然而，男性和女性在1公里试验中使用的步速策略大致相似。
在1公里自定步速试验中观察到的VO2max值高于GXT。这表明在非电动跑步机上进行的1公里跑步试验可作为评估VO2max的一种简单且特定于运动项目的替代方法。
