Gjestvang Christina, Stensrud Trine, Haakstad Lene A H
Department of Sports Medicine, Norwegian School of Sports Sciences, Oslo, Norway.
BMJ Open Sport Exerc Med. 2017 Jul 6;3(1):e000232. doi: 10.1136/bmjsem-2017-000232. eCollection 2017.
To evaluate how rating of perceived capacity (RPC) is related to maximal oxygen uptake (VO) and examine VO at onset of training in healthy adults.
In total, 125 newly registered fitness centre members, equally men and women, answered the RPC scale and performed a treadmill test for measurement of VO. Eligible criteria were <4 weeks of fitness centre membership, physically inactive, ≥18 years and not pregnant. The RPC is a one-page scale (1-20) based on metabolic equivalent tasks, where the individual chooses the most strenuous activity that can be sustained for at least 30 min.
The Bland-Altman plot demonstrated a tendency of overestimation, meaning that the participants ranked their own aerobic capacity 17.5% higher than objectively measured values of VO. The mean difference between the two methods were +4.92±1.96 and +6.35±1.96 mL/min/kg VO in men and women, respectively. The Pearson correlation coefficient was moderate, with r=0.426 (p<0.01). A linear regression analysis showed that both age and VO were significant predictors of RPC (p<0.01). Measured VO at onset of fitness centre membership was in men aged 38.7±11.7 and women aged 34.7±9.9, 40.5±7.2 and 35.0±6.0 mL/min/kg, respectively. Estimated VO from the RPC scale was 45.7±9.8 and 41.4±10.1 mL/min/kg in men and women, respectively.
The RPC seems less accurate at the individual level and may overestimate VO. Still, it may be considered useful in large-scale studies.
评估自感运动能力（RPC）评分与最大摄氧量（VO₂）之间的关系，并研究健康成年人开始训练时的VO₂。
总共125名新注册的健身中心会员（男女各半）回答了RPC量表，并进行了跑步机测试以测量VO₂。入选标准为健身中心会员资格<4周、身体不活跃、年龄≥18岁且未怀孕。RPC是一个基于代谢当量任务的单页量表（1 - 20），个体选择能够持续至少30分钟的最剧烈活动。
布兰德-奥特曼图显示存在高估趋势，即参与者对自己有氧能力的排名比VO₂的客观测量值高17.5%。两种方法在男性和女性中的平均差异分别为+4.92±1.96和+6.35±1.96 mL/min/kg VO₂。皮尔逊相关系数为中等，r = 0.426（p<0.01）。线性回归分析表明年龄和VO₂都是RPC的显著预测因素（p<0.01）。健身中心会员开始时测量的VO₂，男性年龄为38.7±11.7岁，女性年龄为34.7±9.9岁，分别为40.5±7.2和35.0±6.0 mL/min/kg。根据RPC量表估计的VO₂，男性和女性分别为45.7±9.8和41.4±10.1 mL/min/kg。
RPC在个体层面似乎不太准确，可能会高估VO₂。不过，它在大规模研究中可能仍被认为是有用的。
