Key result
8-week training linked to increased fat-free mass, peak power, and VO2max gains correlating with supine LnHF.
Why the study?
Does an eight week training preparation improve autonomic cardiac regulation and morpho-physiological parameters in junior soccer players?
Observational (n=12)
Does an eight week training preparation improve autonomic cardiac regulation and morpho-physiological parameters in junior soccer players?
p-value: p=<0.05
An 8-week training program in junior soccer players improved body composition and short-term endurance without significantly altering autonomic cardiac regulation or fatigue perception.
May enhance body composition and power in junior athletes without autonomic benefits; leaves open effects on cardiac regulation.
Background: Training preparation in soccer is thought to improve body composition and performance level, especially the maximal aerobic capacity (VO2max). However, an enhancement in performance may be attenuated by the increase of fatigue. Heart rate variability (HRV) as a non-invasive index of autonomic nervous system (ANS) activity has been considered to be a sensitive tool in fatigue assessment. Objective: This study was focused to evaluate the response of ANS activity and morpho-physiological parameters to eight week training preparation. Methods: Study included 12 trained soccer players aged 17.2 ± 1.2 years. Athletes underwent pre- and post-preparation testing that included the ANS activity assessment by spectral analysis of HRV in supine and upright position. Further, body composition was analyzed via electrical bio-impedance method and physiological parameters were assessed during maximal stress tests. ANS activity and subjective feeling of fatigue was assessed continuously within subsequent weeks of preparation. Results: No significant differences in all HRV variables within weeks were found. Pre vs. post analyses revealed a significant (p < .05) increase in body weight, fat free mass, body mass index, and peak power. AÂ significant decline in mean maximal heart rate (HR) and resting HR at standing was identified at the end of preparation. Since no significant changes between pre- post-preparation in the mean VO2max occurred, the positive correlation between the individual change in VO2max and the vagally related HRV [supine LnHF (r = .78), Ln rMSSD (r = .63), and the standing LnHF (r = .73, p < .05)] was found. Conclusions: This study showed that an 8 week training program modified particularly fat free mass and short-term endurance, whereas both the autonomic cardiac regulation and the feeling of fatigue remained almost unaffected. Standing position seems to be more sensitive in terms of the HR response in relation to fatigue perception than supine.
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Botek et al. (2014) conducted an observational in Healthy junior soccer players (n=12). 8-week training preparation vs. Baseline was evaluated on Response of autonomic nervous system activity and morpho-physiological parameters (p=<0.05). An 8-week training program increased fat-free mass and peak power (p<0.05), with individual changes in VO2max positively correlated with supine LnHF (r=0.78).
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