Wong Stephen, Burnley Mark, Mauger Alexis, Fenghua Sun, Hopker James
School of Sport and Exercise Sciences, University of Kent, Chipperfield Building, Canterbury Campus, Canterbury, UK.
Department of Health and Physical Education, Education University of Hong Kong, Tai Po, Hong Kong.
J Sports Sci. 2022 Dec;40(23):2578-2584. doi: 10.1080/02640414.2023.2176045. Epub 2023 Feb 20.
Functional Threshold Power (FTP) has been considered a valid alternative to other performance markers that represent the upper boundary of the heavy intensity domain. However, such a claim has not been empirically examined from a physiological perspective.This study examined the blood lactate and VO response when exercising at and 15 W above the FTP (FTP). Thirteen cyclists participated in the study. The VO was recorded continuously throughout FTP and FTP, with blood lactate measured before the test, every 10 minutes and at task failure. Data were subsequently analysed using two-way ANOVA. The time to task failure at FTP and FTP were 33.7 ± 7.6 and 22.0 ± 5.7 minutes (p < 0.001), respectively. The VO was not attained when exercising at FTP (VO: 3.61 ± 0.81 vs FTP 3.33 ± 0.68 L·min, p < 0.001). The VO stabilised during both intensities. However, the end test blood lactate corresponding to FTP and FTP was significantly different (6.7 ± 2.1 mM vs 9.2 ± 2.9 mM; p < 0.05). The VO response corresponding to FTP and FTP suggests that FTP should not be considered a threshold marker between heavy and severe intensity.
功能性阈值功率（FTP）被认为是其他代表高强度运动领域上限的运动表现指标的有效替代指标。然而，从生理学角度来看，这一说法尚未得到实证检验。本研究检测了在FTP及高于FTP 15瓦的强度下运动时的血乳酸和摄氧量（VO）反应。13名自行车运动员参与了该研究。在整个FTP和高于FTP强度的运动过程中持续记录VO，在测试前、每10分钟以及运动任务失败时测量血乳酸。随后使用双向方差分析对数据进行分析。在FTP和高于FTP强度下运动至任务失败的时间分别为33.7±7.6分钟和22.0±5.7分钟（p<0.001）。在FTP强度下运动时未达到VO（VO：3.61±0.81 vs FTP 3.33±0.68L·min，p<0.001）。在两种强度下VO均趋于稳定。然而，与FTP和高于FTP强度相对应的测试结束时血乳酸水平存在显著差异（6.7±2.1mM vs 9.2±2.9mM；p<0.05）。与FTP和高于FTP强度相对应的VO反应表明，不应将FTP视为高强度和极量强度之间的阈值指标。
