Unité de Recherche Pluridisciplinaire Sport Santé Société, ULR 7369 - URePSSS - Univ. Littoral Côte d'Opale, Univ. Lille, Univ. Artois, Lille, France.
Laboratoire Mouvement, Equilibre, Performance, Santé. Campus Montaury, EA 4445 - Université Pau Pays De l'Adour, Anglet, France.
J Sports Sci. 2021 Aug;39(15):1717-1722. doi: 10.1080/02640414.2021.1898093. Epub 2021 Mar 16.
The purpose of this study was to analyze the influence of grade of obesity on the probability of achieving a VO2 plateau and threshold secondary criteria for verifying VO2max during a treadmill walk test in youths with obesity. Therefore, 72 youths with obesity (aged 8-16) performed an incremental treadmill walk test to exhaustion during which oxygen uptake (VO2), minute ventilation (VE), heart rate (HR) and rating of perceived exertion were continuously measured. HR corresponding to a "hard" level of perceived exertion was reported and expressed as a percentage of the predicted HRmax. The rate of achievement of criteria for validation VO2max (VO2 plateau; HR>95% theoretical HRmax; RER>1.0; rating of perceived exertion ≥ "hard") was compared between participants with grade I and grade II obesity. 37% of the participants achieved a VO2 plateau and 23% achieved both an HR>95% and RER >1.0. Youths with grade II obesity had lower minute ventilation (p<0.01) tended to be more likely to reach an HR>95% (OR = 0.33; P=0.06) and a "hard" rating of perceived exertion than grade I (OR = 4.5; P=0.07). However, there was no influence of grade of obesity on the achievement of VO2 plateau, and RER>1.0.
本研究旨在分析肥胖程度对肥胖青少年在跑步机步行测试中达到 VO2 平台和阈值次要标准以验证 VO2max 的可能性的影响。因此，72 名肥胖青少年（8-16 岁）进行了递增跑步机步行测试直至力竭，在此过程中持续测量摄氧量（VO2）、分钟通气量（VE）、心率（HR）和感知用力程度。报告并表示与“硬”感知用力程度相对应的 HR 为预测 HRmax 的百分比。比较了 I 级和 II 级肥胖参与者达到验证 VO2max 标准（VO2 平台；HR>95%理论 HRmax；RER>1.0；感知用力程度≥“硬”）的比例。37%的参与者达到了 VO2 平台，23%的参与者达到了 HR>95%和 RER>1.0。II 级肥胖青少年的分钟通气量较低（p<0.01），更有可能达到 HR>95%（OR = 0.33；P=0.06）和“硬”感知用力程度（OR = 4.5；P=0.07）。然而，肥胖程度对达到 VO2 平台和 RER>1.0 没有影响。
