Key result
Strength training overload increased supine heart rate and decreased vagal heart rate variability, whereas high-intensity interval training overload decreased standing heart rate and increased vagal heart rate variability.
Why the study?
The study sought to determine the effects of strength training and high-intensity interval training overload on cardiac autonomic modulation by measuring heart rate and vagal heart rate variability.
Does strength training or high-intensity interval training overload alter heart rate and vagal heart rate variability in well-trained athletes?
Population
37 well-trained athletes
Comparison
Strength training overload vs high-intensity interval training overload
Design
Two independent study arms
Authors
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Altered position-specific HRV during overload suggests monitoring utility; leaves open surrogate value for performance without consistent links.
Does strength training or high-intensity interval training overload alter heart rate and vagal heart rate variability in well-trained athletes?
Standardized Mean Difference: 0.4 (95% CI 0.06–0.74)
Absolute Event Rate: 64% vs 60%
p-value: p=0.176
Strength training and high-intensity interval training overload elicit distinct cardiac autonomic responses that are detectable via orthostatic testing but not consistently correlated with short-term performance changes.
Schneider et al. (2019) studied Healthy well-trained athletes (n=37). Strength training (ST) and high-intensity interval training (HIIT) overload microcycles vs. Baseline (repeated measures) was evaluated on Supine heart rate (bpm) at 1 day post strength training overload (single-day measure) (dpre 0.40, 95% CI 0.06-0.74, p=0.176). Strength training overload increased supine heart rate and decreased vagal heart rate variability, whereas high-intensity interval training overload decreased standing heart rate and increased vagal heart rate variability.
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