Resistance exercise decreases β-endorphin immunoreactivity

Abstract

Previous research investigating the response of plasma β-endorphins (β-EP) to resistance exercise has resulted in equivocal findings. To examine further the effects of resistance exercise on β-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 β-endorphin levels were determined by radioimmunoassay. A Students t test for paired samples indicated that mean(s.e.) plasma β-endorphin levels after exercise (10.5(1.3) pg β-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 β-EP clearance during rest intervals and changes in psychological states between sampling. © 1994.