ISSN:
1439-6327
Keywords:
Urinary electrolyte excretions
;
Aldosterone
;
Catecholamines
Source:
Springer Online Journal Archives 1860-2000
Topics:
Medicine
Notes:
Summary Muscle cell leakage and hormonal changes were compared immediately after and during the 3 days following a 24 h endurance run (R24 h) in 8 subjects, and a 10 h triathlon non-competitive race (T10 h) in 6 subjects. The study showed three main differences: 1) plasma enzyme increases were considerably more significant in R24 h than in T10 h: compared with resting levels, creatine kinase increased ×120 after R24 h but only ×2 after T10 h; lactic dehydrogenase ×4, as opposed to ×1.5; and transaminases only showed an increase after R24 h. The plasma myoglobin increase after R24 h was double that found after T10 h; 2) for the same magnitude of plasma aldosterone and cortisol after R24 h and T10 h (3 times the resting levels), a highly significant decrease in urinary Na+ (p〈0.001) and an increase in urinary K+ (p〈0.01) were found only after R24 h; and 3) the plasma free noradrenaline level increased significantly after R24 h (×2.6) whereas it was unchanged after T10 h. In contrast, the plasma level of conjugated dopamine increased only after T10 h (×3.7, p〈0.05). These results suggest that long-distance running causes more muscular lesions than the triathlon, and that important factors other than aldosterone are probably involved in the regulation of urinary electrolyte excretions during T10 h.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00418460
Permalink
