Key result
Baseline cardiorespiratory fitness was inversely associated with post-HIIT systolic blood pressure in boys (p=0.010) and girls (p=0.037), with fatness mediating this effect only in boys.
Why the study?
It remains unknown how fatness affects the influence of cardiorespiratory fitness on blood pressure in adolescents undergoing high-intensity interval training.
Does fatness mediate the association between baseline cardiorespiratory fitness and post-intervention blood pressure after high-intensity interval training in adolescents?
Observational (n=64)
Does fatness mediate the association between baseline cardiorespiratory fitness and post-intervention blood pressure after high-intensity interval training in adolescents?
Effect estimate: B = -0.603 (boys); B = -0.394 (girls)
p-value: p=0.010 (boys); 0.037 (girls)
Fatness mediates the beneficial effects of cardiorespiratory fitness on systolic blood pressure following high-intensity interval training in adolescent boys, highlighting the importance of managing both fitness and adiposity.
Fatness may mediate adolescent CRF-BP responses to HIIT; hypothesis-generating and should not yet change practice.
Background: Low cardiorespiratory fitness (CRF), elevated blood pressure (BP), and high fatness are cardiovascular disease risk factors. It remains unknown how fatness affects the influence of CRF on BP. Therefore, the aim was to examine whether the associations between baseline CRF and HIIT-postintervention resting BP were mediated through fatness in adolescents. Material and methods: The sample (n = 64) comprised 28 boys 36 girls aged 16 years. The analysed factors were fitness index- reflecting CRF, body fat mass (BFM), fat mass index (FMI), and body mass index (BMI). Bootstrapped mediation procedures were performed. The mediation analysis was conducted concerning the sex moderation effect. Results: The mediation effect of sex was confirmed; therefore, mediations models were designed separately for boys and girls. The results showed a statistically significant inverse relationship between baseline CRF and post-intervention systolic blood pressure (SBP) in both sexes (boys: B = −0.603, p = 0.010; girls: B = −0.394, p = 0.037). The relations between CRF and SBP revealed the mediation effect of the BFM and the FMI only in boys. Conclusions: Fatness mediated associations between CRF and SBP in boys. Therefore, both CRF and fatness are necessary to maintain positive results of the BP revealed in normal SBP ranges after HIIT.
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Domaradzki et al. (2022) reported an observational. Baseline cardiorespiratory fitness and fatness was evaluated on Post-intervention systolic blood pressure (SBP) (B = -0.603 (boys); B = -0.394 (girls), p=0.010 (boys); 0.037 (girls)). Baseline cardiorespiratory fitness was inversely associated with post-HIIT systolic blood pressure in boys (p=0.010) and girls (p=0.037), with fatness mediating this effect only in boys.
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