| dc.description.abstract | Strength resistance exercises is one of the most
commonly used training methods by strength
and conditioning professionals. Physiological
and psychological stress effect for the Autonomic
nervous system (ANS), and Heart rate variability
(HRV) is a reliable non-invasive method to
evaluate the ANS. Frequency domain describes
the periodic oscillations of the heart-rate signal. It
provides information related to the distribution of
HRV as a function of frequency. Past literature well
explored the parasympathetic and sympathetic
responses induced by aerobic exercises, but
the acute effects of strength exercise on HRV is
limited. Therefore, the purpose of the present
study was to evaluate the effect of acute strength
resistance exercises on HRV in physically active
men. Twelve (n=12) physically active men (age
23.1±0.8 years; height 171.5±4.32 cm; body mass
71.2±3.67 kg) participated in this study. Subjects
were assigned into two groups as group CON
(control) and group EXP (experiment) randomly.
5 minutes supine position HRV data was
measured with controlled breathing, 10 minutes
before (Pre-test) and 30 minutes after (Posttest)
strength resistance exercise session. Study
data revealed that significant increase of Low-
Frequency (LFnu) value (p≤0.0001) and LFnu/
HFnu ratio (p≤0.001) and significant reduction
in High-Frequency (HFnu) value (p≤0.0001) in
the experimental group compared to control
group. Cohen’s deffect size results revealed large
practical significance in LFnu parameter (3.78),
LFnu/HFnu ratio parameter (3.58) and HFnu
parameter (2.92). In conclusion, acute strength
resistance exercises have an effect on heart rate
variability in physically active men. | en_US |
