Cardiac autonomic modulation post-maximal incremental exercise is not influenced by body mass index in young adult men
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The purpose of this study was to analyze whether cardiac autonomic modulation recovery at short-term after maximal incremental exercise test in young adults is influenced by the body mass index (BMI).
Forty-eight healthy untrained men (22.26 ± 3.08 years old) were evaluated; 18 were normal weight (NW: 21.89 ± 1.75 kg m−2), 11 were overweight (Ov: 27.00 ± 1.38 kg m−2) and 19 were obese (O: 34.38 ± 3.36 kg m−2). After the maximal incremental exercise test, a 10 min recovery (5 min actively, followed by 5 min passively) was performed to analyze cardiac autonomic modulation recovery. The root mean square successive differences between adjacent RR intervals (RMSSD) and standard deviation of all normal RR intervals (SDNN) indexes were determined in successive non-overlapped 30 s segments transformed in natural logarithmic—Ln.
LnRMSSD and LnSDNN indexes were reduced at the end of the incremental exercise test and remained reduced throughout 5 min of active recovery, and throughout 5 min after this time compared to baseline resting (p < 0.05), with no differences (p > 0.05) among the groups. However, throughout 5 min (330–600 s) after active recovery, the LnSDNN values were higher than the end of exercise (NW: 0.56 ± 0.19; Ov: 0.56 ± 0.25; O: 0.57 ± 0.16 ms; p < 0.05).
Although there was no vagal reactivation at short-term after a maximal incremental exercise test, there were alterations in the overall heart rate variability regardless of BMI in apparently healthy young adult men.
KeywordsObesity Recovery Autonomic control Heart rate variability Parasympathetic activity
Body mass index
Heart rate variability
Root mean square successive difference between adjacent RR intervals
Standard deviation of all normal RR intervals
Carbon dioxide production
This research was supported by the Fundação de Amparo a Pesquisa do Estado de Mato Grosso under grant [FAPEMAT- number 151411/2014], Conselho Nacional de Desenvolvimento Científico e Tecnológico under grant [CNPq - number 443361/2014-2], Fundação de Amparo a Pesquisa do Estado de Mato Grosso (FAPEMAT) and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) for granting the scholarships in master degree.
Compliance with ethical standards
Conflicts of interests
The authors declare that they have no competing interests.
All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the Declaration of Helsinki. All procedures were approved by the University Research Ethics Committee.
Informed consent was obtained from all individual participants in this study.
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