Summary
Sex-related differences of catecholamine responses were evaluated in nine healthy women and six age-matched men at rest and during incremental treadmill erxercise. Heart rate, oxygen uptake (\(V_{{\text{O}}_{\text{2}} }\)), glucose and lactate blood levels as well as the free plasma catecholamines, noradrenaline and adrenaline, were determined. No significant differences were observed for these parameters between the two groups at rest. The females had relative \(V_{O_{2{\text{max}}} } \) and maximal running velocities similar to the males, which points to a comparable dynamic performance ability. However, at identical work loads, noradrenaline, adrenaline and glucose levels were significantly higher in women than in men. Lactate, heart rate and relative \(V_{{\text{O}}_{\text{2}} }\) showed a similar tendency at submaximal exercise levels, indicating higher strain at identical stress levels in women. The reason for the higher sympathetic activity in women at identical work loads may be their relatively smaller skeletal muscle mass in relation to the loads during this test.
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Supported by Bundesinstitut für Sportwissenschaften, Cologne-Lövenich, FRG
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Lehmann, M., Berg, A. & Keul, J. Sex-related differences in free plasma catecholamines in individuals of similar performance ability during graded ergometric exercise. Europ. J. Appl. Physiol. 55, 54–58 (1986). https://doi.org/10.1007/BF00422893
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DOI: https://doi.org/10.1007/BF00422893