Key result
Four weeks of high-intensity interval exercise training did not change resting baroreflex sensitivity (LFgain; P=0.66, effect size=0.21) compared to control in healthy adolescents.
Why the study?
The authors sought to investigate the effects of high-intensity interval exercise training and detraining on resting baroreflex sensitivity and its vascular and autonomic components in healthy adolescents.
Does high-intensity interval exercise (HIIE) training improve baroreflex sensitivity and its vascular and autonomic components at rest in healthy adolescents?
RCT (n=19)
Randomly allocated
Does high-intensity interval exercise (HIIE) training improve baroreflex sensitivity and its vascular and autonomic components at rest in healthy adolescents?
Standardized Mean Difference: 0.21
p-value: p=0.66
Four weeks of high-intensity interval training does not significantly alter resting baroreflex sensitivity or its autonomic and vascular determinants in healthy adolescents.
Four-week HIIE does not improve resting baroreflex sensitivity in healthy adolescents; challenges presumed rapid autonomic benefits and leaves open longer protocols or at-risk groups.
PURPOSE: In a sample of healthy adolescents, the authors aimed to investigate the effects of high-intensity interval exercise (HIIE) training and detraining on baroreflex sensitivity (BRS) and it's vascular and autonomic components at rest. METHODS: Nineteen volunteers were randomly allocated to (1) 4 weeks HIIE training performed 3 times per week or (2) a control condition with no intervention for the same duration as HIIE training. PRE, POST, and following 2 weeks of detraining resting supine heart rate and blood pressure were measured, and a cross-spectral method (integrated gain [gain in low frequency]) was used to determine BRS gain. Arterial compliance (AC) was assessed as the BRS vascular component. LFgain divided by AC (LFgain/AC) was used as the autonomic determinant of BRS. RESULTS: The HIIE training was completed with 100% compliance. HIIE did not change resting gain in low frequency (LFgain) (P = .66; effect size = 0.21), AC (P = .44; effect size = 0.36), or LFgain/AC (P = .68; effect size = 0.19) compared to control. CONCLUSION: Four weeks of HIIE training does not change BRS and its autonomic and vascular determinant in a sample of healthy adolescents at rest.
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Oliveira et al. (2021) conducted an RCT in Healthy adolescents (n=19). High-intensity interval exercise (HIIE) training vs. Control condition with no intervention was evaluated on Resting gain in low frequency (LFgain) for baroreflex sensitivity (effect size 0.21, p=0.66). Four weeks of high-intensity interval exercise training did not change resting baroreflex sensitivity (LFgain; P=0.66, effect size=0.21) compared to control in healthy adolescents.
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