Differences in epinephrine and substrate responses between arm and leg exercise

S. P. Hooker, C. L. Wells, M. M. Manore, S. A. Philip, N. Martin

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

The purpose of this study was to determine epinephrine (EPI) and selected substrate responses during arm crank (AC) and leg cycle (LC) exercise at the same absolute and relative exercise intensity. Nine males performed 30 min AC and LC tests at 70% of ergometer-specific peak oxygen uptake (V̇O2), and a 30 min LC test eliciting a similar V̇O2 required during the AC test. Blood samples (30 ml) were collected via an indwelling arm catheter at rest, and at minutes 13 and 28 of exercise for determinations of plasma EPI, serum free fatty acid (FFA), serum glycerol (GLY), blood glucose (GLU), and blood lactate (LA) concentrations. At equivalent V̇O2, higher (P < 0.05) EPI, LA, and respiratory exchange ratio (RER) responses were obtained during AC than LC exercise. However, these physiologic responses were similar during AC and LC exercise at the same relative intensity. No significant differences over time were observed for FFA, GLY, and GLU between AC and LC exercise at either the same absolute or relative intensity. The results support previous hypotheses that AC exercise is physiologically more stressful than LC exercise at the same V̇O2. The data further indicate that adrenomedullary activity (EPI response) and substrate utilization (LA and RER responses) are regulated by relative exercise intensity and not the exercising muscle mass.

Original languageEnglish (US)
Pages (from-to)779-784
Number of pages6
JournalMedicine and Science in Sports and Exercise
Volume22
Issue number6
StatePublished - 1990

Fingerprint

Epinephrine
Leg
Arm
Lactic Acid
Nonesterified Fatty Acids
Glycerol
Indwelling Catheters
Serum
Blood Glucose
Oxygen
Glucose
Muscles

Keywords

  • ADRENOMEDULLARY ACTIVITY
  • EXERCISE INTENSITY
  • EXERCISING MUSCLE MASS
  • FREE FATTY ACID
  • GLUCOSE
  • GLYCEROL
  • LACTATE

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine
  • Public Health, Environmental and Occupational Health
  • Physical Therapy, Sports Therapy and Rehabilitation

Cite this

Hooker, S. P., Wells, C. L., Manore, M. M., Philip, S. A., & Martin, N. (1990). Differences in epinephrine and substrate responses between arm and leg exercise. Medicine and Science in Sports and Exercise, 22(6), 779-784.

Differences in epinephrine and substrate responses between arm and leg exercise. / Hooker, S. P.; Wells, C. L.; Manore, M. M.; Philip, S. A.; Martin, N.

In: Medicine and Science in Sports and Exercise, Vol. 22, No. 6, 1990, p. 779-784.

Research output: Contribution to journalArticle

Hooker, SP, Wells, CL, Manore, MM, Philip, SA & Martin, N 1990, 'Differences in epinephrine and substrate responses between arm and leg exercise', Medicine and Science in Sports and Exercise, vol. 22, no. 6, pp. 779-784.
Hooker, S. P. ; Wells, C. L. ; Manore, M. M. ; Philip, S. A. ; Martin, N. / Differences in epinephrine and substrate responses between arm and leg exercise. In: Medicine and Science in Sports and Exercise. 1990 ; Vol. 22, No. 6. pp. 779-784.
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