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J Appl Physiol 75: 1828-1835, 1993;
8750-7587/93 $5.00
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Journal of Applied Physiology, Vol 75, Issue 4 1828-1835, Copyright © 1993 by American Physiological Society

ARTICLES

Effects of age, adiposity, and fitness level on plasma catecholamine responses to standing and exercise

W. M. Kohrt, R. J. Spina, A. A. Ehsani, P. E. Cryer and J. O. Holloszy
Department of Internal Medicine, Washington University School of Medicine, St. Louis, Missouri 63110.

The plasma norepinephrine (NE) and epinephrine (E) responses to a variety of stressors are influenced by age, adiposity, and exercise training status. The objectives of this study were to 1) compare basal levels as well as posture- and exercise-induced changes in plasma NE and E concentrations in young [25 +/- 1 (SE) yr; n = 24] and older (64 +/- 1 yr; n = 106) people and examine the associations of the responses with adiposity and maximal O2 uptake (VO2max) and 2) determine the extent to which the NE and E responses are altered by exercise training in older people. We found no significant differences in basal NE and E levels between young and older subjects. However, the NE response to standing was exaggerated in older people (696 +/- 39 vs. 512 +/- 61 pg/ml; P < 0.05), whereas NE and E responses to exercise requiring approximately 78% of VO2max were attenuated in older people (NE: 1,444 +/- 74 vs. 1,983 +/- 222 pg/ml; E: 109 +/- 10 vs. 228 +/- 29 pg/ml; both P < 0.01). Increments in NE and E during exercise were more closely associated with age (NE: r = -0.38; E: r = -0.46; both P < 0.05) and VO2max (NE: r = 0.43; E: r = 0.52; both P < 0.05) than with adiposity (NE: r = -0.29; E: r = -0.25; both P < 0.05). In 48 older subjects who completed 9 mo of exercise training, the increases in NE and E during exercise at the same absolute intensity were 39 and 57% lower, respectively.(ABSTRACT TRUNCATED AT 250 WORDS)


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