Pierce E F, Eastman N W, McGowan R W, Tripathi H, Dewey W L, Olson K G
Department of Health and Sport Science, University of Richmond, Virginia 23173.
Br J Sports Med. 1994 Sep;28(3):164-6. doi: 10.1136/bjsm.28.3.164.
Previous research investigating the response of plasma beta-endorphins (beta-EP) to resistance exercise has resulted in equivocal findings. To examine further the effects of resistance exercise on beta-EP immunoreactivity, 10 male and 10 female college-age students participated in a series of controlled isotonic resistance exercises. The session consisted of three sets of eight repetitions at 80% of one repetition maximum (1-RM) for each of the following exercises: (1) bench press; (2) lateral pull-downs; (3) seated arm curls; and (4) military press. Blood plasma was sampled both before and after the lifting routine and beta-endorphin levels were determined by radioimmunoassay. A Students t test for paired samples indicated that mean(s.e.) plasma beta-endorphin levels after exercise (10.5(1.3) pg beta-EP ml-1) were significantly decreased as compared with pre-exercise (control) levels (16.5(1.2), P < 0.05). While the mechanism(s) contributing to the decrease in immunoreactivity is unclear, it may be the result of the synergistic effect of beta-EP clearance during rest intervals and changes in psychological states between sampling.
以往关于血浆β-内啡肽（β-EP）对阻力运动反应的研究结果并不明确。为了进一步研究阻力运动对β-EP免疫反应性的影响，10名男性和10名女性大学生参加了一系列控制性等张阻力运动。训练内容包括以下每项运动以一次最大重复量（1-RM）的80%进行三组，每组八次重复：（1）卧推；（2）引体向下；（3）坐姿哑铃弯举；（4）推举。在举重训练前后采集血浆样本，并通过放射免疫分析法测定β-内啡肽水平。配对样本的学生t检验表明，运动后血浆β-内啡肽平均水平（10.5(1.3) pg β-EP ml-1）与运动前（对照）水平（16.5(1.2)）相比显著降低（P < 0.05）。虽然导致免疫反应性降低的机制尚不清楚，但这可能是休息期间β-EP清除的协同作用以及采样期间心理状态变化的结果。
