Key result
Short (<5-minute) and long (15-minute) bouts of high-intensity functional training demonstrated similar transient strain and recovery of the autonomic nervous system in healthy males.
Why the study?
Does the duration of High-Intensity Functional Training (HIFT) affect Autonomic Nervous System (ANS) recovery in healthy males?
RCT (n=10)
Does the duration of High-Intensity Functional Training (HIFT) affect Autonomic Nervous System (ANS) recovery in healthy males?
p-value: p=0.822 (lnRMSSD)
Short (<5-minute) and long (15-minute) bouts of high-intensity functional training produce similar transient strain and recovery of the autonomic nervous system in healthy males.
HIFT duration may influence ANS recovery in healthy males; leaves open effects in patients and requires larger trials.
The evaluation of Autonomic Nervous System (ANS) recovery following exercise provides insight into the transient stress placed on the cardiovascular system. High-Intensity Functional Training (HIFT) is a form of intense exercise that is prescribed in various modalities and durations; however, little is known about the influence of HIFT duration on ANS recovery. Ten apparently healthy males (28.1 ± 5.4 yrs) performed two HIFT sessions (<5-minute and 15-minute) in a crossover fashion. ANS activity was measured using plasma Epinephrine (E) and Norepineprine (NE); Heart Rate Variability markers of the log transformed Root Mean Square of Successive Differences (lnRMSSD) and High-Frequency power (lnHF). No trial dependent differences were observed in lnRMSSD (p = 0.822), lnHF (p = 0.886), E (p = 0.078), or NE (p = 0.194). A significant main time effect was observed in both trials with a depression in lnRMSSD and lnHF following the trials (p < 0.05) and recovering by 2-hours post (p = 0.141, p > 0.999) respectively. A trial dependent increase in E and NE occurred immediately post (p < 0.05) and recovered by 1-hour post (p > 0.999, p > 0.999) respectively. The HIFT bouts examined within this study demonstrated similar transient strain of the ANS.
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Kliszczewicz et al. (2018) conducted an RCT in Healthy (n=10). High-Intensity Functional Training (HIFT) vs. <5-minute session was evaluated on Autonomic Nervous System (ANS) recovery (lnRMSSD, lnHF, Epinephrine, Norepinephrine) (p=0.822 (lnRMSSD)). Short (<5-minute) and long (15-minute) bouts of high-intensity functional training demonstrated similar transient strain and recovery of the autonomic nervous system in healthy males.
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