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CC BY-NC-ND 4.0 · Sports Med Int Open 2018; 02(04): E98-E104
DOI: 10.1055/a-0655-7207
Physiology & Biochemistry
Eigentümer und Copyright ©Georg Thieme Verlag KG 2018

The Influence of Oxygen Saturation on the Relationship Between Hemoglobin Mass and VO2max

Jesse A. Goodrich
1   Department of Integrative Physiology, University of Colorado Boulder, Boulder, United States
,
Benjamin J. Ryan
1   Department of Integrative Physiology, University of Colorado Boulder, Boulder, United States
,
William C. Byrnes
1   Department of Integrative Physiology, University of Colorado Boulder, Boulder, United States
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Publikationsverlauf

received 12. Februar 2018
revised   11. Mai 2018

accepted 05. Juni 2018

Publikationsdatum:
06. September 2018 (online)

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Einführung zu diesem Artikel:

Sports Medicine International Open –recently publishedInt J Sports Med 2018; 39(12): 955-955
DOI: 10.1055/a-0740-3955

Abstract

Hemoglobin mass (tHb) is a key determinant of maximal oxygen uptake (VO2max). We examined whether oxyhemoglobin desaturation (ΔSaO2) at VO2max modifies the relationship between tHb and VO2max at moderate altitude (1,625 m). Seventeen female and 16 male competitive, endurance-trained moderate-altitude residents performed two tHb assessments and two graded exercise tests on a cycle ergometer to determine VO2max and ΔSaO2. In males and females respectively, VO2max (ml·kg−1·min−1) ranged from 62.5–83.0 and 44.5–67.3; tHb (g·kg−1) ranged from 12.1–17.5 and 9.1–13.0; and SaO2 at VO2max (%) ranged from 81.7–94.0 and 85.7–95.0. tHb was related to VO2max when expressed in absolute terms and after correcting for body mass (r=0.94 and 0.86, respectively); correcting by ΔSaO2 did not improve these relationships (r=0.93 and 0.83). Additionally, there was a negative relationship between tHb and SaO2 at VO2max (r=–0.57). In conclusion, across a range of endurance athletes at moderate altitude, the relationship between tHb and VO2max was found to be similar to that observed at sea level. However, correcting tHb by ΔSaO2 did not explain additional variability in VO2max despite significant variability in ΔSaO2; this raises the possibility that tHb and exercise-induced ΔSaO2 are not independent in endurance athletes.

Key words

endurance performance - oxygen transport - exercise-induced desaturation - hypoxia - altitude
 

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