Movement, Sport and Health Sciences Laboratory (M2S), UFR-APS, University of Rennes 2-ENS Cachan, Rennes, France.
Med Sci Sports Exerc. 2011 Mar;43(3):408-15. doi: 10.1249/MSS.0b013e3181f1bef3.
The aim of this study was to examine the effect of body fat percentage on the plasma catecholamine response to a cycling sprint test (CST) in sedentary adolescent boys.
In this study, 31 adolescent boys (9 obese (% body fat = 31.0% ± 3.0%), 11 overweight (% body fat = 24.0% ± 1.6%), and 11 lean (% body fat = 16.0% ± 1.9%)), matched for peak oxygen consumption, completed a CST consisting of six 6-s maximal sprints with 2 min of passive rest between each repetition. Performance of each subject was determined as the mean power output (PO(mean)) developed during the CST. Plasma lactate, epinephrine, and norepinephrine concentrations were determined successively at rest, after a 10-min warm-up, immediately after the CST, and after 20 min of passive recovery.
Although groups were not different in age, height, or peak oxygen consumption (mL·kg(-1) fat-free mass·min(-1)), maximal epinephrine concentration was significantly (P < 0.05) higher in lean vs obese and was negatively correlated to body fat percentage (r = -0.60, P < 0.05). Maximal norepinephrine values were higher in lean versus overweight and obese, and a negative relationship was found between maximal norepinephrine concentration and body fat percentage (r = -0.60, P < 0.05). Maximal lactate concentration was higher in lean versus overweight and obese (14.7 ± 3.3, 10.4 ± 2.7, and 10.2 ± 2.5 mM in lean, overweight, and obese, respectively). A significant relationship was also obtained between maximal norepinephrine and maximal epinephrine values with both maximal lactate concentration (r = 0.60 and r = 0.60, P < 0.05, respectively) and PO(mean) (r = 0.65 and r = 0.6, P < 0.05).
Our results show that the catecholamine response to a CST was affected by body fat percentage, with reduced epinephrine and norepinephrine values in overweight and obese adolescents.
本研究旨在探讨体脂百分比对久坐青少年男性进行自行车冲刺测试（CST）时血浆儿茶酚胺反应的影响。
在这项研究中，31 名青少年男孩（9 名肥胖者（%体脂=31.0%±3.0%），11 名超重者（%体脂=24.0%±1.6%）和 11 名瘦者（%体脂=16.0%±1.9%）），按峰值耗氧量匹配，完成由六次 6 秒最大冲刺组成的 CST，每次重复之间有 2 分钟的被动休息。每位受试者的表现均由 CST 期间产生的平均功率输出（PO（mean））确定。在休息时、10 分钟热身结束时、CST 后立即以及 20 分钟被动恢复后，连续测定血浆乳酸、肾上腺素和去甲肾上腺素浓度。
尽管各组在年龄、身高或峰值耗氧量（mL·kg（-1）去脂体重·min（-1））方面没有差异，但瘦者的最大肾上腺素浓度显著（P<0.05）高于肥胖者，且与体脂百分比呈负相关（r=-0.60，P<0.05）。瘦者的最大去甲肾上腺素值高于超重和肥胖者，最大去甲肾上腺素浓度与体脂百分比呈负相关（r=-0.60，P<0.05）。瘦者的最大乳酸浓度高于超重和肥胖者（分别为 14.7±3.3、10.4±2.7 和 10.2±2.5 mM）。最大去甲肾上腺素和最大肾上腺素值与最大乳酸浓度之间也存在显著关系（r=0.60 和 r=0.60，P<0.05）和 PO（mean）（r=0.65 和 r=0.6，P<0.05）。
我们的结果表明，CST 时儿茶酚胺反应受到体脂百分比的影响，超重和肥胖青少年的肾上腺素和去甲肾上腺素值降低。
