Key result
A 15-week High-Intensity Functional Training intervention did not significantly influence resting heart rate variability or post-exercise vagal reactivation in healthy college students.
Why the study?
Does 15-week High-Intensity Functional Training alter resting heart rate variability and post-exercise vagal reactivation in healthy college students?
Does 15-week High-Intensity Functional Training alter resting heart rate variability and post-exercise vagal reactivation in healthy college students?
A 15-week high-intensity functional training program improved exercise performance but did not alter resting autonomic nervous system activity or post-exercise vagal reactivation in healthy young adults.
Answers are grounded in this paper and cite their sources.
No HRV changes after 15-week HIFT in healthy students; hypothesis-generating for autonomic effects in other populations or longer protocols.
The purpose of this investigation was to examine the training effects of a 15-week High-Intensity Functional Training (HIFT) on Autonomic Nervous System (ANS). Eleven apparently healthy college students participated in this study. Participants were enrolled in a 15-week CrossFit® training based academic course, two days a week. On the first and last scheduled day of class participants performed a HIFT trial and ANS activity was measured through Heart Rate Variability (HRV) for 10 minutes prior to and following each bout using the log-transformed square root of the successive R-R differences (lnRMSSD) and high frequency power (lnHF). A significant decreased was observed for the lnRMSSD after the HIFT trial before (Pre: 3.86 ± 0.39 vs. Post: 2.58 ± 1.12; P < 0.001) and after (Pre: 4.00 ± 0.46 vs. 1.96 ± 0.84; P < 0.001) the intervention. Similarly, the lnHF was significantly reduced before (Pre: 3.66 ± 0.36 vs. Post: 2.88 ± 0.86; P < 0.05) and after (Pre: 3.73 ± 0.41 vs. 2.69 ± 0.65; P < 0.001) 15-weeks of this intervention. The exercise modality known as HIFT was effective in improving repetitions completed during the HIFT trial, when comparing pre and post trials. The findings of this study suggest that resting HRV and post exercise vagal reactivation is not influenced by 15-weeks of a HIFT intervention.
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Kliszczewicz et al. (2016) studied Healthy (n=11). High-Intensity Functional Training (HIFT) vs. Baseline was evaluated on Autonomic Nervous System activity measured through Heart Rate Variability (lnRMSSD and lnHF). A 15-week High-Intensity Functional Training intervention did not significantly influence resting heart rate variability or post-exercise vagal reactivation in healthy college students.
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