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Τρίτη 10 Οκτωβρίου 2017

Do male athletes with already high initial hemoglobin mass benefit from ‘live high–train low’ altitude training?

Abstract

It has been proposed that athletes with high initial values of hemoglobin mass (Hbmass) will have a lower Hbmass increase in response to 'live high-train low' (LHTL) altitude training. To verify this assumption, the relationship between initial absolute and relative Hbmass values and their respective Hbmass increase following LHTL in male endurance and team-sport athletes was investigated. Overall, 58 male athletes (35 well-trained endurance athletes and 23 elite male field hockey players) undertook an LHTL training camp with similar hypoxic doses (200–230 h). Hbmass was measured in duplicate pre- and post-LHTL with the carbon monoxide rebreathing method. While there was no relationship (r = 0.02, P = 0.91) between initial absolute Hbmass (g) and percentage increase in absolute Hbmass, a moderate relationship (r = −0.31, P = 0.02) between initial relative Hbmass (g·kg−1) and percentage increase in relative Hbmass was detected. Mean absolute and relative Hbmass increased to a similar extent (P ≥ 0.81) in endurance (from 916 ± 88 to 951 ± 96 g, +3.8%, P < 0.001 and from 13.1 ± 1.2 to 13.6 ± 1.1 g·kg−1, +4.1%, P < 0.001) and team-sport (from 920 ± 120 to 957 ± 127 g, +4.0%, P < 0.001 and from 11.9 ± 0.9 to 12.3 ± 0.9 g·kg−1, +4.0%, P < 0.001) athletes following LHTL. The direct comparison study using individual data of male endurance and team-sport athletes and strict methodological control (duplicate Hbmass-measures, matched-hypoxic dose) indicated that even athletes with higher initial Hbmass can reasonably expect Hbmass gain post-LHTL.

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