Cardiovagal dynamics in a block training session compared to circuit training: randomized controlled trial
DOI:
https://doi.org/10.47197/retos.v72.116904Keywords:
High-Intensity Interval Training, Autonomic Nervous System, Resistance Training, Circuit-Based Exercise, AdultAbstract
Background: Heart rate variability is key for adjusting loads in cardiovagal training programs.
Objective: This study evaluated the dynamics of the Root Mean Square of Successive Differences (RMSSD) and RR intervals during a high-intensity interval training session, comparing two modalities: block training and circuit training.
Methods: A controlled, randomized, double-blind design was used, involving 32 physically active university students divided into control and experimental groups. The experimental group performed the exercises in a block format, while the control group followed a circuit format. Heart rate variability was measured during exercise and recovery periods, analyzing heart rate, RR intervals, RMSSD, and the RR ratio. Inferential analyses were conducted using the independent samples t-test, verifying the homogeneity of variances with Levene’s test. Effect sizes were calculated using Cohen’s d.
Results: Both groups showed a decrease in heart rate variability, but the experimental group exhibited a significant increase in heart rate and a greater decrease in RR intervals during the fourth set (p < 0.001; d = 1.71). RMSSD and its relationship with RR intervals remained stable without significant differences.
Conclusion: Block training leads to a higher cardiovascular demand and a reduction in heart rate variability compared to the circular format.
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