Health and Human Performance.
Quantitative Methods and Computer Science, University of St. Thomas , St. Paul, Minnesota, USA.
J Sports Sci Med. 2005 Dec 1;4(4):482-8. eCollection 2005 Dec.
The anaerobic threshold (AT) has been defined as the theoretical highest exercise level that can be maintained for prolonged periods. It is of practical importance to the competitive endurance athlete to measure progress and plan training programs. The primary objective of this study was to assess the reliability and validity of breakpoint in the respiratory rate (RR) during incremental exercise as a marker for the AT. Secondary objectives were 1) to assess the reliability of the ventilatory threshold (VE) and ventilatory equivalent (VE/VO2) breakpoint, and 2) to assess differences in these 3 methods for their potential to measure change in fitness, as measured by standard error of measurement (SEM), coefficient of variability (CV), and correlation coefficient (R). Fifteen competitive male cyclists (5 category II, 6 category III, 1 category IV, 3 category V United States Cycling Federation) completed 2 maximal oxygen consumption tests within one week on an electronically braked cycle ergometer. A repeated measures Analysis of Variance using 2x3 design (test and methods) resulted in no significant differences (F = 0.02, p = 0.978), indicating that 1)all 3 methods are reproducible, and 2) RR, when compared to VE and VE/VO2, is a valid method of assessing the anaerobic threshold. The lowest SEM, lowest CV and highest R were obtained with the VE method (SEM = 19.4 watts, CV = 6.7%, R = 0.872), compared to VE/VO2 (SEM = 21.5 watts, CV = 7.4%, R=.811) and RR (SEM = 35.3 watts, CV = 12.2%, R = 0.800). From the results of this study, it is concluded that the RR method is a valid and reliable method for detecting AT. However, due to the relatively high SEM and CV, and low R, when compared to VE and VE/VO2, its insensitivity to small changes seen in highly fit athletes would preclude its use in measuring changes in AT. It appears that either VE or VE/VO2 would be appropriate for measuring AT changes in highly fit athletes. Key PointsRespiratory rate is a valid and reliable marker of the anaerobic threshold.Due to a relatively high standard error of measurement and coefficient of variability for the respiratory rate method, use of ventilation (VE) and ventilatory equivalent for oxygen (VE/VO2 is preferred when assessing changes in anaerobic threshold.When assessing changes in maximal aerobic capacity, maximal watts has a lower standard error of measurement and coefficient of variability and is preferred over changes in maximal oxygen consumption.
无氧阈 (AT) 已被定义为可以长时间维持的理论最高运动水平。对于竞技耐力运动员来说，测量进展和制定训练计划具有实际意义。本研究的主要目的是评估递增运动中呼吸率 (RR) 的断点作为 AT 标志物的可靠性和有效性。次要目标是 1) 评估通气阈 (VE) 和通气当量 (VE/VO2) 断点的可靠性，以及 2) 评估这 3 种方法在测量通过测量标准误差 (SEM)、变异系数 (CV) 和相关系数 (R) 来衡量健身变化的潜在能力。15 名有竞争力的男性自行车手 (5 类 II，6 类 III，1 类 IV，3 类 V 美国自行车联合会) 在电子制动自行车测力计上一周内完成了 2 次最大摄氧量测试。使用 2x3 设计 (测试和方法) 的重复测量方差分析导致无显着差异 (F = 0.02，p = 0.978)，表明 1) 所有 3 种方法都是可重复的，并且 2)与 VE 和 VE/VO2 相比，RR 是评估无氧阈的有效方法。VE 方法的最低 SEM、最低 CV 和最高 R 分别为 19.4 瓦、6.7%和 0.872，与 VE/VO2(SEM = 21.5 瓦、CV = 7.4%和 R=.811)和 RR(SEM = 35.3 瓦、CV = 12.2%和 R = 0.800)相比。从这项研究的结果可以得出结论，RR 方法是检测 AT 的有效且可靠的方法。然而，由于与 VE 和 VE/VO2 相比，RR 方法的 SEM 和 CV 较高，R 值较低，因此对于高度适应的运动员的微小变化不敏感，因此不适合测量 AT 的变化。似乎 VE 或 VE/VO2 都适合测量高度适应的运动员的 AT 变化。关键点呼吸率是无氧阈的有效且可靠标志物。由于 RR 方法的测量标准误差和变异系数相对较高，因此在评估无氧阈变化时，与呼吸率相比，通气 (VE) 和通气当量用于氧气 (VE/VO2 更受青睐。当评估最大有氧能力的变化时，最大瓦特的测量标准误差和变异系数较低，并且优于最大耗氧量的变化。
