THE ENDURANCE TRAINING EFECTS OF HIGH – ALTITUDE ALPINISTIC EXPEDITION MAY BE LESS STRONG STIMULUS FOR PERFORMANCE IN HYPOXIA, THAN ACCLIMATIZATION
Journal Title: Medicina Sportiva - Year 2012, Vol 16, Issue 2
Abstract
Objective: To ascertain whether the exercise stimulus during high–altitude alpinistic expedition is enough strong to influ¬ence alpinists performance similarly as acclimatization. Methods: Two groups: 4 alpinists (age: 45 ± 8 yrs; BW: 75 ± 5 kg; BH: 171 ± 20 cm) who reached the summit of the Gasherbrum II (GAS) and 5 alpinists (age: 55 ± 11 yrs; BW: 74 ± 9 kg; BH: 177 ± 7 cm) who reached the summit of the Ama Dablam (AMA), were voluntary participated in the study. They repeated incremental test on the cycle ergometer before and after expeditions in normoxic and hypoxic (FiO2= 0.18) conditions. Results: Lactate Threshold (LT) (146 ± 28 W before and 149 ± 13 W after) and Ventilatory Threshold (VT) (144 ± 36 W before and 134 ± 16 W after) remained unchanged on GAS, but increased from 140 ± 14 W before to 164 ± 10 W (P < 0.05) after AMA expedition during testing in normoxic conditions. During exercise at the same reference power limit (RPL) intensity before and after GAS expedition VE increased from 83 ± 9 to 104 ± 16 l/min (P < 0.01) during normoxic and from 111 ± 13 to 135 ± 12 l/min during hypoxic testing. Differently, VE did not change in AMA. Acclimatization significantly in¬creased SaO2 during RPL in GAS expedition (89 ± 1 % before to 92 ± 1 % (P < 0.01) after, but not in AMA. Conclusions: Results showed a strong acclimatization effect in GAS expedition. The increase of endurance was presented only in less endurance subjects in AMA.
Authors and Affiliations
Anton Ušaj, Burnik Stojan
Keywords
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- EP ID EP74180
- DOI 10.5604/17342260.1001878
- Views 99
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