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Sustained noradrenaline sulphate response in long-distance runners and untrained subjects up to 2 h after exhausting exercise



Sustained noradrenaline sulphate response in long-distance runners and untrained subjects up to 2 h after exhausting exercise



European Journal of Applied Physiology & Occupational Physiology 66(5): 421-426



We investigated the response of plasma and platelet free catecholamine ((CA)) and sulphated catecholamine ((CA-S)) concentrations after an incremental treadmill test to exhaustion and during recovery. In triathletes (n = 9) plasma and platelet (CA) and (CA-S) were measured before, immediately after and 0.5 and 24 h after exercise. In long-distance runners (n = 9) and in controls (n = 10) plasma (CA) and (CA-S) were determined 2 h instead of 24 h after exercise. Platelet (CA) and (CA-S) remained unchanged throughout the study. Plasma (CA) increased after exercise in all groups (P lt 0.05) and returned to pre-exercise values within 0.5 h of recovery. Plasma sulphoconjugated noradrenaline concentration ((NA-S)) was elevated after exercise in the triathletes, long-distance runners and in controls (9.96 (SEM 0.84) nmol cntdot l-1, 11.8 (SEM 1.19) nmol cntdot l-1, 9.53 (SEM 1.10) nmol cntdot l-1, respectively; P lt 0.05) compared with resting values (7.13 (SEM 1.04) nmol cntdot l-1, 6.19 (SEM 0.56) nmol cntdot l-1, 6.76 (SEM 0.67) nmol cntdot l-1, respectively) and remained elevated after 0.5 h of recovery (9.94 (SEM 1.14) nmol cntdot l-1, 10.96 (SEM 0.80) nmol cntdot l-1, 8.95 (SEM 0.99) nmol cntdot l-1, respectively; P lt 0.05). In the long-distance runners and controls plasma (NA-S) remained elevated during 2 h of recovery (9.96 (SEM 0.76) nmol cntdot l-1, 9.03 (SEM 0. 88) nmol cntdot l-1, respectively). These results would indicate that plasma (NA-S) increases after sympathetic nervous system activation by an exhausting incremental exercise test and remain elevated up to 2 h after exercise.

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Accession: 009498826

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PMID: 8330610

DOI: 10.1007/bf00599615


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