Are there Differences between Adolescent Males and Females for Maintaining the Metabolic Cost at Maximal Oxygen Uptake

M. Saghiv, Chris Sherve, D. Sira, M. Saghiv, E. Goldhammer
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引用次数: 3

Abstract

Purpose: The present study looked at gender difference in oxygen delivery-extraction at maximal oxygen uptake in healthy adolescents. Methods: 36 adolescent males (14.9 ± 1.1 years) and 33 adolescent females (15.0 ± 1.1 years) underwent a maximal oxygen uptake test and a two dimensional direct m-mode echocardiography performed on a bicycle ergometry. Arteriovenous oxygen difference was defined by utilizing the Fick equation. Results: At rest, males compared to females had significantly (p<0.05) higher oxygen extraction (38.8 ± 1.4 and 31.8 ± 1.2 mL.kg-1 .min-1 respectively), systolic blood pressure, and mean arterial blood pressure. At peak exercise test, males compared to females demonstrated significant (P<0.05) higher values for cardiac output (16.6 ± 0.7 and 15.4 ± 0.6 L∙min-1 respectively), stroke volume (83.9 ± 5.1 and 78.5 ± 4.6 mL respectively), oxygen uptake (47.3 ± 3.7 and 39.6 ± 1.1 mL∙kg-1∙min-1, respectivel y), while oxygen extraction was significantly higher in females compared to males (123.6 ± 7.6 and 115.5 ± 5.4 mL∙L-1 respectively). Conclusions: This study suggests that normal adolescents; male and females respond to the maximal oxygen uptake test by increased their left ventricular systolic function, however, it was less augmented in the females due to gender and energy metabolism differences. Consequently, females increased their oxygen extraction more than the males as a compensation for the lower cardiac output and hence, lower oxygen delivery.
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青少年男性和女性在维持最大摄氧量时的代谢成本方面存在差异吗
目的:本研究观察健康青少年最大摄氧量时的氧输送-提取的性别差异。方法:36例青少年男性(14.9±1.1岁)和33例青少年女性(15.0±1.1岁)在自行车上进行最大摄氧量试验和二维直接m型超声心动图。动静脉氧差用菲克方程定义。结果:静息时,男性吸氧量(38.8±1.4 mL.kg-1 .min-1)、收缩压、平均动脉压显著高于女性(p<0.05)。在运动峰值试验中,男性的心输出量(分别为16.6±0.7和15.4±0.6 L∙min-1)、搏气量(分别为83.9±5.1和78.5±4.6 mL)、摄氧量(分别为47.3±3.7和39.6±1.1 mL∙kg-1∙min-1)显著高于女性(分别为123.6±7.6和115.5±5.4 mL∙L-1),而吸氧量(分别为123.6±7.6和115.5±5.4 mL)显著高于男性(P<0.05)。结论:本研究提示正常青少年;男性和女性对最大摄氧量试验的反应是增加左心室收缩功能,但由于性别和能量代谢的差异,女性左心室收缩功能的增强程度较低。因此,雌性比雄性更多地增加吸氧量,以补偿较低的心输出量,从而减少氧气输送。
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