Lehmann M, Keul J, Huber G, Da Prada M
Int J Sports Med. 1981 Aug;2(3):143-7. doi: 10.1055/s-2008-1034601.
Ten untrained subjects and nine trained cyclists were examined during graduated ergometric exercise in the supine position. The levels of epinephrine and norepinephrine in the blood as well as the heart rate and oxygen intake were determined. At submaximum levels, epinephrine, norepinephrine, lactate, and the heart rate are lower in tthe trained than in the untrained subjects; the relative oxygen intake shows no significant difference. The ergometric work capacity is approximately 30% higher in the trained cyclists. During maximum ergometric exercise, the plasma catecholamines, lactate, and the heart rate show no differences between the two groups; the oxygen intake is approximately 30% higher in the trained than in the untrained subjects. A direct relationship exists between catecholamine levels and lactate; however, this relationship becomes less exact during higher exercise intensities: In reference to the same catecholamine concentration, the lactate levels as well as the submaximum heart rates are higher in the trained than in the untrained subjects, the cause of which could be an increased beta-adrenoceptor sensitivity in the trained subjects.
在仰卧位进行递增式测力运动期间，对10名未经训练的受试者和9名训练有素的自行车运动员进行了检查。测定了血液中的肾上腺素和去甲肾上腺素水平以及心率和摄氧量。在次最大运动水平时，训练有素者的肾上腺素、去甲肾上腺素、乳酸和心率低于未经训练的受试者；相对摄氧量无显著差异。训练有素的自行车运动员的测力工作能力高出约30%。在最大测力运动期间，两组之间的血浆儿茶酚胺、乳酸和心率无差异；训练有素者的摄氧量比未经训练的受试者高出约30%。儿茶酚胺水平与乳酸之间存在直接关系；然而，在较高运动强度下这种关系变得不那么精确：在相同的儿茶酚胺浓度下，训练有素者的乳酸水平以及次最大心率高于未经训练的受试者，其原因可能是训练有素者的β-肾上腺素能受体敏感性增加。
