Int J Sports Med 1996; 17(1): 12-16
DOI: 10.1055/s-2007-972801
Physiology and Biochemistry

© Georg Thieme Verlag Stuttgart · New York

Effects of Low-Volume Resistive Exercise on Beta-Endorphin and Cortisol Concentrations

R. R. Kraemer1 , E. O. Acevedo2 , D. Dzewaltowski3 , J. L. Kilgore4 , G. R. Kraemer5 , V. D. Castracane6
  • 1Southeastern Louisiana University, Exercise Physiology Laboratory, Department of Kinesiology and Health Studies, Hammond, LA 70402
  • 2University of New Orleans, Department of Human Performance and Health Promotion, New Orleans, LA 70148
  • 3Kansas State University, Department of Kinesiology, Manhattan, KS 66506 4 Texas Tech University Health Sciences Center, Department of Obstetrics and Gynecology, Amarillo, TX 79106
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Publikationsverlauf

Publikationsdatum:
09. März 2007 (online)

It has been recently suggested that high and sustained lactate levels may elicit increases in peripheral B-EN concentrations (16). We have observed elevated and sustained lactate concentrations in response to a low-volume resistive exercise protocol (14) that were similar to those from other exercise protocols that produced elevated beta-endorphin (B-EN) concentrations. Thus, the purpose of the study was to determine the effects of a low-volume (21,700 J) resistive exercise repetition maximum (RM) protocol using weight machines on peripheral lactate, B-EN and Cortisol concentrations. Subjects completed 3 sets of bench press, lat-pull, leg extension, and leg curl exercise at a 10-RM load. Blood samples were collected and rating of perceived exertion (RPE, 15-point Borg scale) was assessed before exercise (- 40 and - 10 min), after each exercise, and after the exercise session (+ 35 min); blood samples were collected at 7 additional post-exercise times. RPE increased significantly throughout the exercise. Lactate concentrations rose significantly to peak at 8.54 mM at LE. B-EN and Cortisol concentrations (- 10) of 4.63 ± 0.54 pmol · l-1 and 12.09 ± 1.44 μg · dl-1, respectively, were not significantly elevated over time. The data suggest that a low-volume resistive exercise protocol using weight machines elevates lactate concentrations without altering B-EN and Cortisol concentrations.

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