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Effects of exercise mode on haemoglobin oxygen level and distribution in aerobically-trained 40—50 year-old females
Abstract   Peer reviewed

Effects of exercise mode on haemoglobin oxygen level and distribution in aerobically-trained 40—50 year-old females

T Cole-Hunter, I Stewart and Colin Solomon
Journal of Science and Medicine in Sport, Vol.12(Supplement 2), pp.e29-e30
Australian Conference of Science and Medicine in Sport, 7th National Physical Activity Conference, 6th National Sports Injury Prevention Conference, Be Active ‘09, 2009 (Brisbane, Australia, 14-Oct-2009–17-Oct-2009)
2010
DOI: https://doi.org/10.1016/j.jsams.2009.10.060
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https://doi.org/10.1016/j.jsams.2009.10.060View
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Abstract

Human Movement and Sports Science Public Health and Health Services
Introduction: During moderate and high intensity exercise, approximately half of moderately and highly aerobically trained healthy individuals exhibit a potentially physiologically detrimental decrease in haemoglobin oxygen saturation (HbO2%). Women have a higher incidence of exercise-induced HbO2% desaturation (EIHD), and increased age could increase susceptibility to EIHD due to the age-associated changes in pulmonary mechanics affecting ventilation. The effect of exercise mode, and the contribution of HbO2 distribution between the respiratory and locomotor muscles on EIHD are unresolved. This project was designed to test the hypothesis that in 40–50-year-old aerobically-trained women, running, compared to cycling, would produce EIHD, and that this EIHD would be associated with a decrease in HbO2 at the accessory respiratory muscle—Serratus Anterior, and an increase in HbO2 at the locomotor muscle—Vastus Lateralis. Methods: Using a repeated-measures, counter-balanced deign, twelve aerobically-trained female triathletes (age range: 40—49 year.) each performed two incremental maximal exercise tests, one running and one cycling, separated by 24 ± 1 h. HbO2% was determined using pulse oximetry and near-infrared spectroscopy. Results: Six of nine subjects (67%) exhibited EIHD during running; and only one subject exhibiting EIHD during cycling. At VO2 peak, running, compared to cycling, resulted in a significantly lower group mean HbO2% (92.0 ± 1.3 vs. 95.4 ± 1.0%), higher minute ventilation (60.8 ± 4.0 vs. 42.4 ± 6.0 L min), higher relative peak oxygen consumption (50.0 ± 1.3 vs. 47.0 ± 1.6 mL Kg min), lower exercise-induced increase in HbO2% in Serratus Anterior (35 ± 29 vs. 251 ± 51%), and higher exercise-induced increase in HbO2% in Vastus Lateralis (69 ± 44 vs. 1 ± 36%). Discussion: These results indicate that EIHD occurs in aerobically trained 40–50-year-old women during running, compared to cycling, and that this difference is associated with a re-distribution of HbO2% from respiratory muscle to locomotive muscle.

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