Goulopoulou Styliani, Fernhall Bo, Kanaley Jill A
Department of Exercise Science, Syracuse University, Syracuse, NY 13244, USA.
Int J Pediatr. 2010;2010. doi: 10.1155/2010/153780. Epub 2010 Aug 29.
The purpose of this study was to examine differences in pressor response and cardiovagal modulation during isometric handgrip exercise (IHG) between children and adults. Beat-to-beat heart rate (HR) and blood pressure were measured in 23 prepubertal children and 23 adults at baseline and during IHG. Cardiovagal modulation was quantified by analysis of HR variability. Mean arterial pressure responses to IHG were greater in adults compared to children (P < .05) whereas there were no group differences in HR responses (P > .05). Children had a greater reduction in cardiovagal modulation in response to IHG compared to adults (P < .05). Changes in mean arterial pressure during IHG were correlated with baseline cardiovagal modulation and force produced during isometric contraction (P < .05). In conclusion, differences in pressor reflex response between children and adults cannot be solely explained by differences in autonomic modulation and appear to be associated with factors contributing to the force produced during isometric contraction.
本研究的目的是探讨儿童和成人在等长握力运动（IHG）期间升压反应和心血管迷走神经调节的差异。在23名青春期前儿童和23名成人的基线期和IHG期间测量逐搏心率（HR）和血压。通过分析HR变异性对心血管迷走神经调节进行量化。与儿童相比，成人对IHG的平均动脉压反应更大（P <.05），而HR反应在两组间无差异（P>.05）。与成人相比儿童对IHG的心血管迷走神经调节降低更大（P <.05）。IHG期间平均动脉压的变化与基线心血管迷走神经调节和等长收缩期间产生的力量相关（P <.05）。总之，儿童和成人之间升压反射反应的差异不能仅由自主神经调节的差异来解释，似乎与等长收缩期间产生力量的因素有关。
