Norepinephrine response to exercise at the same relative intensity before and after endurance exercise training

• Published in: Journal of applied physiology (1985) 1999-02, Vol.86 (2), p.531-535
• Main Authors: Greiwe, Jeffrey S, Hickner, Robert C, Shah, Suresh D, Cryer, Philip E, Holloszy, John O
• Format: Article
• Language: English
• Subjects: Adult; Anaerobic Threshold - physiology; Anatomy & physiology; Biological and medical sciences; Epinephrine - blood; Exercise; Exercise - physiology; Female; Fundamental and applied biological sciences. Psychology; Heart Rate - physiology; Hormones; Humans; Male; Nervous system; Neurotransmitters; Norepinephrine - blood; Physical Endurance - physiology; Vertebrates: body movement. Posture. Locomotion. Flight. Swimming. Physical exercise. Rest. Sports
• ISSN: 8750-7587; 1522-1601
• DOI: 10.1152/jappl.1999.86.2.531

Department of Internal Medicine, Washington University School of Medicine, St. Louis, Missouri 63110 It is well documented that endurance exercise training results in a blunted norepinephrine (NE) response to exercise of a given absolute exercise intensity. However, it is not clear what effect training has on the catecholamine response to exercise of the same relative intensity because previous studies have provided conflicting results. The purpose of the present study was, therefore, to determine the catecholamine response to exercise of the same relative exercise intensity before and after endurance exercise training. Six women and three men [age 28 ± 8 (SD) yr] performed 10 wk of training. Maximal O 2 uptake ( O 2 max ) was determined during treadmill exercise. Fifteen-minute treadmill exercise bouts were performed at 60, 65, 70, 75, 80, and 85% of O 2 max before and after training. O 2 max was increased by 20% (from 39.2 ±   7.7 to 46.9 ± 8.1 ml · kg 1 · min 1 ; P