Key result
Overtraining syndrome in endurance athletes was associated with a stronger correlation between R-R interval and high-frequency variability compared to controls (R^2 0.87 vs 0.78; P=0.034).
Why the study?
Does overtraining syndrome alter the relationship between R-R interval and R-R interval variability in endurance athletes?
Case-Control (n=19)
Does overtraining syndrome alter the relationship between R-R interval and R-R interval variability in endurance athletes?
Effect estimate: Effect size 1.22
Absolute Event Rate: 0.87% vs 0.78%
p-value: p=0.034
Overtraining syndrome in endurance athletes is associated with a stronger within-subject correlation between R-R interval and vagally mediated R-R interval variability, which normalizes upon recovery.
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May indicate autonomic dysregulation in overtraining; leaves open utility for monitoring recovery in endurance athletes.
Kiviniemi et al. (2013) conducted a case-control in Overtraining syndrome (n=19). Overtraining syndrome vs. Control endurance athletes was evaluated on Relationship (R^2) between R-R interval (RRi) and log-transformed high-frequency (HFln) oscillations (Effect size 1.22, p=0.034). Overtraining syndrome in endurance athletes was associated with a stronger correlation between R-R interval and high-frequency variability compared to controls (R^2 0.87 vs 0.78; P=0.034).
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