A 16-week high-intensity functional training intervention in healthy women significantly reduced resting heart rate (p=0.018) and body fat percentage (p=0.012), but did not alter HRV (p=0.501).
Does a 16-week high-intensity functional training intervention improve resting cardiac autonomic activity and body composition in healthy females?
A 16-week high-intensity functional training program improved resting heart rate and body fat percentage but did not significantly alter heart rate variability in healthy women.
valor p: p=0.501 for lnRMSSD, 0.018 for RHR, 0.012 for BF%
High-Intensity Functional Training (HIFT) is an increasingly popular mixed modal high-intensity training style with little empirical evidence regarding adaptations. The objective of this study was to examine alterations in resting cardiac autonomic activity through the measurement of heart rate variability (HRV) and body composition in women following 16-weeks of HIFT. Nine apparently healthy females (35.8 9.3 years old) participated in this study. Resting heart rate (RHR), HRV, and body composition measures were collected pre and post 16-weeks of the HIFT intervention. The markers of HRV used were the Root Mean Square of Successive Differences (RMSSD) and High-Frequency (HF) power. Body composition markers used were body fat percentage (BF%) and body mass (BM). A natural log transformation (ln) was applied to HRV markers prior to analysis. Paired sample t-test showed significant reductions in post RHR (p = 0.018) and BF% (p = 0.012). However, no significant changes were observed in post lnRMSSD (p = 0.501), lnHF (p = 0.760), or BM (p = 0.285). 16-weeks of HIFT was not sufficient to alter makers of HRV. Importantly, the participation in 16-weeks of HIFT elicited improvements in basic health measures (RHR and BF%) in recreationally active females.
Bechke et al. (Sun,) conducted a other in Healthy (n=9). High-Intensity Functional Training (HIFT) vs. Baseline (pre-intervention) was evaluated on Resting heart rate (RHR), heart rate variability (HRV), and body composition (body fat percentage and body mass) (p=0.501 for lnRMSSD, 0.018 for RHR, 0.012 for BF%). A 16-week high-intensity functional training intervention in healthy women significantly reduced resting heart rate (p=0.018) and body fat percentage (p=0.012), but did not alter HRV (p=0.501).
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