Changes in Electrolytes and Trace Elements During Long-Lasting Exercise

Haralambie, G

doi:10.1007/978-3-0348-5523-5_40

Cited by 10 publications

(2 citation statements)

References 33 publications

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“…The effect of work duration (8 h and more) on serum magnesium changes also needs to be investigated. The acute response to sustained exercise is commonly a rise in serum iron (18,19). This is in direct contrast to the decrease observed in the present study.…”

Section: Metabolic Picturecontrasting

confidence: 97%

“…Serum magnesium levels during and immediately subsequent to prolonged work have been shown to decrease (34,32,18), which is presumably the result of an exchange of magnesium between the plasma and other body compartments, including muscle (7) and erythrocytes (39). The present study, however, does not confirm that prolonged exercise is associated with a decline in serum magnesium levels.…”

Section: Metabolic Picturecontrasting

confidence: 89%

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Physiologic and Biochemical Changes During a Triathlon Competition

Rensburg¹,

Kielblock²,

Linde³

1986

Int J Sports Med

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The triathlon has come to be recognized as a distinct endurance event and although a substantial body of research information exists with regard to the individual components (canoeing, cycling, running, etc.), the physiologic demands imposed by combining the respective activities into one continuous event have not yet been assessed. Twenty-three male athletes (age = 33 +/- 5.2 yr; mass = 71.79 +/- 7.42 kg; height = 176.0 +/- 7.21 cm; means +/- SD) participated in the study on the basis of informed consent. Venous blood samples, taken immediately prior to and on completion of the Iron Man Triathlon held in Johannesburg during 1983, were assayed for parameters of energy metabolism, fluid and electrolyte balance, and stress (tissue enzymes in serum). On the basis of post-race blood glucose (6.17 mmol. l-1), free fatty acids (1943 mumol. l-1), and blood lactate (3.45 mmol. l-1) changes, it was concluded that the triathlon is primarily, in an overall sense, an aerobic event. With the exception of magnesium and iron, serum electrolyte changes agreed with literature findings. However, body mass reductions (average 3.23 kg, i.e., 4.5%) indicated that the extent of dehydration is more severe in the triathlon than in comparable endurance events. Post-race enzyme levels (LD, CK, and AST) were significantly elevated, and LD negatively correlated with total performance time (P less than 0.01). The general conclusion is that the physiologic demand of the triathlon exceeds that of other comparable endurance events.

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Section: Metabolic Picturecontrasting

confidence: 97%