Key result
Caffeine ingestion (5 mg/kg) delayed heart rate recovery (p=0.05) and parasympathetic reactivation (p=0.01) after high-intensity intermittent exercise compared to placebo.
Why the study?
The effects of caffeine ingestion on autonomic modulation at rest and after high-intensity intermittent exercise were investigated.
Does caffeine ingestion alter autonomic modulation at rest and after high-intensity intermittent exercise in handball athletes?
RCT (n=7)
Does caffeine ingestion alter autonomic modulation at rest and after high-intensity intermittent exercise in handball athletes?
p-value: p=0.05 for HRR30s; 0.01 for RMSSD30s
Caffeine ingestion prior to high-intensity exercise delays parasympathetic reactivation during recovery in athletes.
May warrant caution with pre-exercise caffeine in athletes; leaves open effects on recovery or performance.
Background: We investigated the effects of caffeine ingestion on autonomic modulation at rest and after a high-intensity intermittent exercise (HIIE). Methods: Seven handball athletes performed a HIIE 60 minutes after ingesting caffeine (5 mg·kg−1) or placebo. We analyzed the heart rate at rest (HRrest) and both time (standard deviation of normal-to-normal interval time series [SDNN]; the root mean square of successive differences [RMSSD] in the normal-to-normal intervals) and frequency (low frequency [LF]; high frequency [HF]; low frequency-to-high frequency ratio [LF/HF]) domains of heart rate variability. Furthermore, we analyzed the RMSSD in the R-R intervals during successive 30-second segments (RMSSD30s) and heart rate recovery (HRR30s) after the exercise. Results: Caffeine ingestion did not influence the HR at rest (p > 0.05) and during the exercise (p > 0.05) but delayed the HRR30s (p = 0.05; ηp2 = 0.48) and RMSSD30s (p = 0.01; ηp2 = 0.03) after the HIIE. Conclusion: Our results suggest that autonomic control of handball players is influenced by caffeine during recovery of the HIIE.
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Lopes‐Silva et al. (2021) conducted an RCT in Healthy handball athletes (n=7). Caffeine vs. Placebo was evaluated on Heart rate recovery (HRR30s) and RMSSD30s after high-intensity intermittent exercise (p=0.05 for HRR30s; 0.01 for RMSSD30s). Caffeine ingestion (5 mg/kg) delayed heart rate recovery (p=0.05) and parasympathetic reactivation (p=0.01) after high-intensity intermittent exercise compared to placebo.
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