Effects of aerobic fitness on cardiac autonomic modulation during supine and upright posture

The purpose of this study was to assess the influence of aerobic fitness on cardiac autonomic modulation in sedentary subjects in the supine and upright posture. Twenty-four young men (22 [+ or -] 2.5 yrs) were assessed for aerobic fitness, including supine and upright posture heart rate and heart r...

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Bibliographic Details
Published in:Journal of exercise physiology online 2013-08, Vol.16 (4), p.92-100
Main Authors: Moreira, Debora do Nascimento, Pecanha, Tiago, Guerra, Zaqueline Fernandes, da Silva, Lilian Pinto, Nakamura, Fabio Yuzo, Laterza, Mateus Camaroti, de Lima, Jorge Roberto Perrout
Format: Article
Language:English
Subjects:
Exercise
Health aspects
Heart beat
Physiological aspects
Physiological research
Posture
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Summary:The purpose of this study was to assess the influence of aerobic fitness on cardiac autonomic modulation in sedentary subjects in the supine and upright posture. Twenty-four young men (22 [+ or -] 2.5 yrs) were assessed for aerobic fitness, including supine and upright posture heart rate and heart rate variability analysis. From the maximal exercise test V[O.sub.2] max values, the subjects were divided into two groups: Low V[O.sub.2] max (n=13) and High V[O.sub.2] max (n = 11). Student's f-test was performed to compare the autonomic variables between the groups (P < 0.05). We observed higher values of [HF.sub.nu] and [LF.sub.nu] during the supine posture and greater responses of the same ratios during the upright posture in the High V[O.sub.2] max group compared to the Low V[O.sub.2] max group. The results of this study indicate that higher aerobic fitness promotes positive cardiac autonomic responses, both during supine and upright posture. Key Words: V[O.sub.2] Max, Heart Rate Variability, Physical Activity
ISSN:1097-9751
1097-9751