Abstract：
BACKGROUND: This study aimed to investigate the effectiveness of a 6-month home-based high-intensity interval training (HIIT) intervention to improve peak oxygen consumption (V̇O2peak) and lactate threshold (LT) in older adults.
METHODS: Two hundred thirty-three healthy older adults (60-84 years; 54% females) were randomly assigned to either 6-month, thrice-weekly home-based HIIT (once-weekly circuit training and twice-weekly interval training) or a passive control group. Exercise sessions were monitored using a Polar watch and a logbook for objective and subjective data, respectively, and guided by a personal coach. The outcomes were assessed using a modified Balke protocol combining V̇O2peak and LT measures. General linear regression models assessed between-group differences in change and within-group changes for each outcome.
RESULTS: There was a significant between-group difference in the pre-to-post change in V̇O2peak (difference: 1.8 [1.2; 2.3] mL/kg/min; exercise: +1.4 [1.0; 1.7] mL/kg/min [~5%]; control: -0.4 [-0.8; -0.0] mL/kg/min [approximately -1.5%]; effect size [ES]: 0.35). Compared with controls, the exercise group had lower blood lactate concentration (-0.7 [-0.9; -0.4] mmol/L, ES: 0.61), % of peak heart rate (-4.4 [-5.7; -3.0], ES: 0.64), and % of V̇O2peak (-4.5 [-6.1; -2.9], ES: 0.60) at the intensity corresponding to preintervention LT and achieved a higher treadmill stage (% incline) at LT (0.6 [0.3; 0.8]; ES: 0.47), following the intervention.
CONCLUSIONS: This study highlights the effectiveness of a home-based HIIT intervention as an accessible and equipment-minimal strategy to induce clinically meaningful improvements in cardiorespiratory fitness in older adults. Over 6 months, the exercise group showed larger improvements in all outcomes compared with the control group. Notably, the LT outcome exhibited a more pronounced magnitude of change than V̇O2peak.
METHODS: Two hundred thirty-three healthy older adults (60-84 years; 54% females) were randomly assigned to either 6-month, thrice-weekly home-based HIIT (once-weekly circuit training and twice-weekly interval training) or a passive control group. Exercise sessions were monitored using a Polar watch and a logbook for objective and subjective data, respectively, and guided by a personal coach. The outcomes were assessed using a modified Balke protocol combining V̇O2peak and LT measures. General linear regression models assessed between-group differences in change and within-group changes for each outcome.
RESULTS: There was a significant between-group difference in the pre-to-post change in V̇O2peak (difference: 1.8 [1.2; 2.3] mL/kg/min; exercise: +1.4 [1.0; 1.7] mL/kg/min [~5%]; control: -0.4 [-0.8; -0.0] mL/kg/min [approximately -1.5%]; effect size [ES]: 0.35). Compared with controls, the exercise group had lower blood lactate concentration (-0.7 [-0.9; -0.4] mmol/L, ES: 0.61), % of peak heart rate (-4.4 [-5.7; -3.0], ES: 0.64), and % of V̇O2peak (-4.5 [-6.1; -2.9], ES: 0.60) at the intensity corresponding to preintervention LT and achieved a higher treadmill stage (% incline) at LT (0.6 [0.3; 0.8]; ES: 0.47), following the intervention.
CONCLUSIONS: This study highlights the effectiveness of a home-based HIIT intervention as an accessible and equipment-minimal strategy to induce clinically meaningful improvements in cardiorespiratory fitness in older adults. Over 6 months, the exercise group showed larger improvements in all outcomes compared with the control group. Notably, the LT outcome exhibited a more pronounced magnitude of change than V̇O2peak.
摘要：
背景：本研究旨在探讨6个月的家庭高强度间歇训练（HIIT）干预措施对改善老年人峰值耗氧量（峰值）和乳酸阈值（LT）的有效性。
方法：230名健康的老年人（60-84岁；54％的女性）被随机分配到6个月，每周三次以家庭为基础的HIIT（每周一次的电路训练和每周两次的间歇训练）或被动对照组。使用极地手表和客观和主观数据的日志来监测运动会话，分别,并由私人教练指导。结果采用改良的Balke方案，结合VäO2peak和LT测量进行评估。一般线性回归模型评估每个结果的组间变化和组内变化的差异。
结果：两组间V-O2峰的前后变化存在显著差异（差异：1.8[1.2;2.3]mL/kg/min；运动：+1.4[1.0;1.7]mL/kg/min[~5%]；对照组：-0.4[-0.8;-0.0]mL/kg/min[约-1.5%]；效应大小[ES]：0.35）。与对照组相比，运动组血乳酸浓度较低(-0.7[-0.9;-0.4]mmol/L,ES：0.61），峰值心率的百分比（-4.4[-5.7;-3.0]，ES：0.64），和%V²O2peak(-4.5[-6.1;-2.9]，ES：0.60）在对应于干预前LT的强度下，并在LT（0.6[0.3;0.8];ES：0.47）时达到较高的跑步机阶段（％倾斜），在干预之后。
结论：本研究强调了以家庭为基础的HIIT干预措施的有效性，该措施是一种易于获得且设备最少的策略，可以在老年人的心肺适应性方面引起有临床意义的改善。超过6个月,与对照组相比,运动组在所有结局方面均有较大改善.值得注意的是,LT结果表现出的变化幅度比VäO2峰更明显。
方法：230名健康的老年人（60-84岁；54％的女性）被随机分配到6个月，每周三次以家庭为基础的HIIT（每周一次的电路训练和每周两次的间歇训练）或被动对照组。使用极地手表和客观和主观数据的日志来监测运动会话，分别,并由私人教练指导。结果采用改良的Balke方案，结合VäO2peak和LT测量进行评估。一般线性回归模型评估每个结果的组间变化和组内变化的差异。
结果：两组间V-O2峰的前后变化存在显著差异（差异：1.8[1.2;2.3]mL/kg/min；运动：+1.4[1.0;1.7]mL/kg/min[~5%]；对照组：-0.4[-0.8;-0.0]mL/kg/min[约-1.5%]；效应大小[ES]：0.35）。与对照组相比，运动组血乳酸浓度较低(-0.7[-0.9;-0.4]mmol/L,ES：0.61），峰值心率的百分比（-4.4[-5.7;-3.0]，ES：0.64），和%V²O2peak(-4.5[-6.1;-2.9]，ES：0.60）在对应于干预前LT的强度下，并在LT（0.6[0.3;0.8];ES：0.47）时达到较高的跑步机阶段（％倾斜），在干预之后。
结论：本研究强调了以家庭为基础的HIIT干预措施的有效性，该措施是一种易于获得且设备最少的策略，可以在老年人的心肺适应性方面引起有临床意义的改善。超过6个月,与对照组相比,运动组在所有结局方面均有较大改善.值得注意的是,LT结果表现出的变化幅度比VäO2峰更明显。
