Jarrett Catherine L, Sawyer Brandon J, Tucker Wesley J, Bhammar Dharini M, Ryder Justin R, Angadi Siddhartha S, Gaesser Glenn A
Elson S. Floyd College of Medicine, Department of Nutrition and Exercise Physiology, Washington State University, Spokane, WA.
Department of Kinesiology, Point Loma Nazarene University, San Diego, CA.
Int J Exerc Sci. 2025 Sep 1;18(5):852-863. doi: 10.70252/VNUF3861. eCollection 2025.
We hypothesized that an increase in nonexercise physical activity (NEPA), assessed by daily steps outside of steps accrued during supervised exercise training sessions, would be positively correlated with the change in VO. Females ages 18-45 yr (n = 44; 30 ± 7 yr; 67.7 ± 18.3 kg; 24.9 ± 6.4 kg/m) completed 36 supervised training sessions on a motorized treadmill (3 sessions/week, 30 min/session) over 12 weeks, at 70% VO (80% max heart rate). VO was assessed at baseline, 4, 8, and 12 weeks, and steps outside of the supervised exercise sessions were recorded daily during each week of training with a hip-worn pedometer. For each participant, linear regression was used to determine the slope of steps/day during the 12 weeks of training. Mean VO increased by 8.2% (30.5 ± 5.9 ml/kg/min to 33.0 ± 5.9 ml/kg/min; range -2.65 ml/kg/min to +6.24 ml/kg/min; < 0.001). Although mean (± Standard Deviation) steps/day did not change during the 12-week intervention, 25 participants decreased daily steps (-1624 ± 1210) and 19 participants increased daily steps (+1713 ± 1402). The change in VO was not different between the two groups ( = 0.74), and the correlation between Δ VO and the slope of the regression (steps/day) over the 12 weeks was not significant (R = 0.0005; = 0.88 for ml/kg/min; R = 0.008, = 0.59 for l/min). Change in NEPA, assessed by daily steps, does not impact the VO adaptation observed during a vigorous-intensity walking exercise program in females ages 18-45 yr.
我们假设，通过监督运动训练期间积累的步数之外的每日步数评估的非运动身体活动（NEPA）增加，将与VO的变化呈正相关。18至45岁的女性（n = 44；30±7岁；67.7±18.3千克；24.9±6.4千克/米）在12周内于电动跑步机上完成了36次监督训练课程（每周3次，每次30分钟），运动强度为VO的70%（最大心率的80%）。在基线、第4、8和12周时评估VO，并且在训练的每周期间，使用佩戴在臀部的计步器每日记录监督运动课程之外的步数。对于每位参与者，使用线性回归来确定训练12周期间每日步数的斜率。平均VO增加了8.2%（从30.5±5.9毫升/千克/分钟增加到33.0±5.9毫升/千克/分钟；范围为 -2.65毫升/千克/分钟至 +6.24毫升/千克/分钟；P<0.001）。虽然在12周的干预期间平均（±标准差）每日步数没有变化，但25名参与者的每日步数减少（-1624±1210），19名参与者的每日步数增加（+1713±1402）。两组之间VO 的变化没有差异（P = 0.74），并且在12周内ΔVO与回归斜率（每日步数）之间的相关性不显著（R = 0.0005；对于毫升/千克/分钟，P = 0.88；对于升/分钟，R = 0.008，P = 0.59）。通过每日步数评估的NEPA变化，不会影响18至45岁女性在高强度步行运动计划期间观察到的VO适应性。
