Key result
A 4-week HIIT program increased RMSSD (p=0.009) and SDNN (p=0.017) and decreased LF/HF ratio (p=0.034) within the exercise group, but showed no significant differences compared to control.
Why the study?
Overweight and obesity increase cardiovascular risk, and HIIT was evaluated to determine its effect on cardiac autonomic modulation assessed via heart rate variability.
Does a 4-week HIIT exercise program improve Heart Rate Variability in overweight/obese men?
RCT (n=18)
randomized
No
Does a 4-week HIIT exercise program improve Heart Rate Variability in overweight/obese men?
A 4-week HIIT program improved within-group HRV parameters in overweight/obese men, though between-group differences compared to no intervention were not significant.
Answers are grounded in this paper and cite their sources.
4-week HIIT yields no between-group HRV benefit versus control; leaves open longer-duration or adherence-focused trials in obese men.
Overweight and obesity have been associated with cardiovascular disease, diabetes mellitus type 2, osteoarthritis, respiratory disorders, cancer, and decline in life expectancy. Cardiac autonomic modulation can be assessed based on Heart Rate Variability (HRV), which is an important marker of cardiovascular risk. High Intensity Interval Training (HIIT) has been developed as an alternative exercise with low volume and expected to help efficiently reduce risk factors associated with the overweight condition. To evaluate the effect of the HIIT exercise program for 4 weeks on HRV in overweight men in Medical Rehabilitation Outpatient Clinic at dr. Soetomo Hospital. This study was conducted from October to December 2020. Eighteen men visited the Medical Rehabilitation Outpatient Clinic at dr. Soetomo Hospital was recruited and randomized into the control and exercise groups. The exercise group performed the HIIT exercise program for 4 weeks and the control group received no intervention. HRV measurement was done before and after the intervention for the exercise group and for the control group was taken before and after 4 weeks of observation. Within-group comparison in the exercise group showed significant increase in RMSSD and SDNN while decrease LF/HF ratio (p = 0.009, p = 0.017, and p = 0.034, respectively). Within-group comparison in the control group showed no significant differences. Between-group comparison at the end of study showed no significant differences. The HIIT exercise program for 4 weeks showed significant increase in RMSSD and SDNN also decrease the LF/HF ratio in overweight/obese men.
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Rustadi et al. (2021) conducted an RCT in Overweight/obesity (n=18). High-intensity interval training (HIIT) vs. No intervention was evaluated on Heart Rate Variability (RMSSD, SDNN, and LF/HF ratio). A 4-week HIIT program increased RMSSD (p=0.009) and SDNN (p=0.017) and decreased LF/HF ratio (p=0.034) within the exercise group, but showed no significant differences compared to control.
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