Serum ??-endorphin levels during a graded exercise test to exhaustion

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Abstract
Ometer to determine if there was a relationship between intensity of exercise and serum β-endorphin (β-EP) levels. Subjects fasted for 12 h and abstained from physical activity at least 24 h prior to testing. Subjects completed the Multiple Affect Adjective Check List prior to and following exercise to ascertain if psychological state would be associated with β-EP levels. The initial workload was 150 kilopond meters and was increased 150 kilopond meters every 3 min until V̇O2max or leg fatigue occurred. Expired gases were continuously analyzed, and a venous blood sample was drawn from an indwelling catheter during the final 30 s of each stage and 5-min post-exercise. β-EP levels were determined from serum using a radioimmunoassay technique and corrected for cross-reactivity with β-lipotropin using affinity chromatography. Resting β-EP levels were 25.3 ± 4.1 pg·ml-1 and did not demonstrate significant changes during any stage of exercise. A correlation analysis (r = 0.30) revealed no significant relationship between exercise intensity and β-EP levels. Following exercise, β-EP levels were significantly increased compared to resting values (38.8 ± 4.8 pg·ml-1). In addition, psychological state was unaffected by exercise despite significant increases in recovery β-EP levels. These data support previous studies reporting increases in β-EP levels following exercise, but do not indicate a relationship between intensity of exercise and β-EP levels during graded exercise or peripheral β-EP levels and psychological state. ©1987The American College of Sports Medicine...

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