| Autor: |
Alfaro, V., Palacios, L., Torras, R. |
| Předmět: |
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| Zdroj: |
Journal of Exercise Physiology Online; Feb2002, Vol. 5 Issue 1, p1-4, 4p, 2 Charts, 2 Graphs |
| Abstrakt: |
Blood lactate (La) levels were analysed during a combined exercise test in elite lifesaving athletes, which included 50 m freestyle swimming at maximal effort, 15-20 m underwater swimming, and 30 m dragging of a mannequin simulating a drowned person. Swimming resulted in increased blood La to a level close the onset of blood La accumulation (3.6±0.9 and 4.6±1.4 mmol/L for men and women, respectively). However, after further underwater swimming blood La did not increase significantly. Finally, after the completion of the combined test higher blood La values (12.7±2.5 and 11.6±2.7 mmol/L for men and women, respectively) were found. These findings suggest that during the intermediate phase of underwater swimming the duration was short enough, and the exercise intensity low enough, for the energy required to be obtained from aerobic sources. Nevertheless, a transient hypercapnia may have occurred, causing the retention of La in the intracellular compartment. However, increased ventilation in the last part of the test in addition to a strong anaerobic effort when dragging the mannequin may lead to the higher La values found at the completion of the trial. More research is required of the metabolic and physiological demands of lifesaving. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Supplemental Index |
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