Facultad de Deportes Campus Ensenada, Universidad Autónoma de Baja California, Ensenada 22800, Mexico.
Department of Health, Sport and Exercise Sciences, University of Kansas, Lawrence, KS 66045, USA.
Int J Environ Res Public Health. 2022 Oct 26;19(21):13897. doi: 10.3390/ijerph192113897.
High-intensity interval training (HIIT) is an exercise modality acknowledged to maintain physical fitness with more engagement in an active lifestyle compared with other traditional exercise models. Nevertheless, its effects on cardiac control and physical performance in an online-guided setting are not yet clarified. The present work assessed physical fitness and heart rate variability (HRV) before and after an online, home-based HIIT program in college-age students while pandemic lockdowns were in effect. Twenty university students (age: 21.9 ± 2.4 years.) that were solely enrolled in online classes were distributed into three groups: control-CON-( = 6), 14 min of HIIT-HIIT-14-( = 8), and 21 min of HIIT-HIIT-21-( = 6). A maximal push-up test was employed to assess muscular endurance and performance, and resting HRV signals were collected with wireless heart rate monitors and were processed in Kubios HRV Std. (Kubios Oy, Finland). There was an increase in total push-up capacity compared to CON ( < 0.05 HIIT-21 vs. CON; < 0.001 HIIT-14 vs. CON) after 8 weeks. A significant interaction was observed in high-frequency and low-frequency spectra ratios after the HIIT-21 intervention ( < 0.05). The current work demonstrated that either short- or mid-volume online, whole-body HIIT improves muscle strength, whereas mid-volume HIIT (HIIT-21) was the only intervention that developed a sympathovagal adaptation. This study showed promising results on muscular endurance and cardiac autonomic modulation through whole-body HIIT practice at home.
高强度间歇训练（HIIT）是一种运动方式，与其他传统运动模式相比，它被认为可以在保持身体健康的同时，更多地参与积极的生活方式。然而，其在在线指导环境下对心脏控制和身体表现的影响尚不清楚。本研究在大学校园学生因疫情封锁而在家进行在线课程的背景下，评估了他们在完成在线、家庭 HIIT 计划前后的身体状况和心率变异性（HRV）。20 名大学生（年龄：21.9 ± 2.4 岁）仅参加在线课程，分为三组：对照组-CON-（n = 6）、14 分钟 HIIT-HIIT-14-（n = 8）和 21 分钟 HIIT-HIIT-21-（n = 6）。最大俯卧撑测试用于评估肌肉耐力和表现，无线心率监测器采集静息 HRV 信号，并使用 Kubios HRV Std.（Kubios Oy，芬兰）进行处理。与 CON 相比，8 周后总俯卧撑能力增加（<0.05 HIIT-21 与 CON；<0.001 HIIT-14 与 CON）。HIIT-21 干预后高频和低频谱比值观察到显著的交互作用（<0.05）。目前的研究表明，无论是短时间还是长时间的在线全身 HIIT 都可以提高肌肉力量，而长时间的 HIIT（HIIT-21）是唯一能够发展交感神经迷走神经适应的干预措施。这项研究通过在家进行全身 HIIT 练习，显示了对肌肉耐力和心脏自主调节的有希望的结果。
