Parathyroid hormone concentrations during and after two periods of high intensity exercise with and without an intervening recovery period |
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Authors: | Bouassida A Zalleg D Zaouali Ajina M Gharbi N Duclos M Richalet J P Tabka Z |
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Institution: | Laboratoire de Physiologie et des Explorations Fonctionnelles, Faculté de Médecine Ibn El Jazzar, avenue Mohamed Karoui, 4002 Sousse, Tunisia. |
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Abstract: | The purpose of this study was to examine the effect of a recovery period between two periods of exercise on bone metabolism
and related hormones. Concentrations of serum parathyroid hormone (PTH]), plasma ionized calcium (Ca2+]) and total calcium were measured. A group of 12 healthy men aged 20–27 years participated in this study. They took part
in two exercise protocols (P1 and P2) on two separate weeks. The exercise in P1 comprised two successive periods of 21 min each at 70% and 85% of maximal oxygen uptake; P2 comprised two periods of exercise at the same intensities but separated by 40 min of recovery. Venous blood samples were
collected 1 day before the sessions (control), before each protocol, during (7th and 21st min), at the end (42nd min in P1 and 82nd min in P2) and after 24 h of recovery. The PTH] was significantly elevated during the two protocols (P<0.01), remained raised in P1 after 24 h of recovery (P<0.05) and was significantly lower (P<0.01) at the end of P2 when compared to P1. The Ca2+] decreased significantly during and at the end of the two protocols (P<0.01) and had returned to control values after 24 h of recovery. Plasma lactate concentration increased during the two protocols
(P<0.01) and returned to control values after recovery. These results indicate firstly that Ca2+] decreases during continuous exercise as PTH] increases and remains raised after 24 h of recovery, secondly that a recovery
period between two periods of exercise attenuates the variations in Ca2+] and PTH], and thirdly that recovery may have anabolic effects on bone. However, the small physiological changes observed
prevent us from forming any firm conclusion about this.
Electronic Publication |
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Keywords: | Exercise Recovery Parathyroid hormone Calcium Lactate |
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