A Comparison of Exercise Responses of Males and Females During Acute Exposure to Hypobaria

Elliott, P.; Atterbom, Hemming A.

doi:10.1249/00005768-197721000-00033

Cited by 4 publications

(8 citation statements)

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“…Arterial oxygen concentration was found to be significantly higher in the double-leg normoxia trial compared to the single and double-leg hypoxia trials which is consistent with previous research and is a well-documented consequence of being in environments with reduced partial pressure of oxygen [ 41 , 42 , 43 , 44 , 45 , 46 , 47 ]. However, SaO2 during single-leg cycling in hypoxia was significantly higher than the double-leg cycling in hypoxia.…”

Section: Discussionsupporting

confidence: 90%

Single Leg Cycling Offsets Reduced Muscle Oxygenation in Hypoxic Environments

Draper

Singer

Dulaney

et al. 2022

IJERPH

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The intensity of large muscle mass exercise declines at altitude due to reduced oxygen delivery to active muscles. The purpose of this investigation was to determine if the greater limb blood flow during single-leg cycling prevents the reduction in tissue oxygenation observed during traditional double-leg cycling in hypoxic conditions. Ten healthy individuals performed bouts of double and single-leg cycling (4, four-minute stages at 50–80% of their peak oxygen consumption) in hypoxic (15% inspired O2) and normoxic conditions. Heart rate, mean arterial pressure, femoral blood flow, lactate, oxygenated hemoglobin, total hemoglobin, and tissue saturation index in the vastus lateralis were recorded during cycling tests. Femoral blood flow (2846 ± 912 mL/min) and oxygenated hemoglobin (−2.98 ± 3.56 au) during single-leg cycling in hypoxia were greater than double-leg cycling in hypoxia (2429 ± 835 mL/min and −6.78 ± 3.22 au respectively, p ≤ 0.01). In addition, tissue saturation index was also reduced in the double-leg hypoxic condition (60.2 ± 3.1%) compared to double-leg normoxic (66.0 ± 2.4%, p = 0.008) and single-leg hypoxic (63.3 ± 3.2, p < 0.001) conditions. These data indicate that while at altitude, use of reduced muscle mass exercise can help offset the reduction in tissue oxygenation observed during larger muscle mass activities allowing athletes to exercise at greater limb/muscle specific intensities.

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Section: Discussionsupporting

confidence: 90%

Single Leg Cycling Offsets Reduced Muscle Oxygenation in Hypoxic Environments

Draper

Singer

Dulaney

et al. 2022

IJERPH

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“…The absence of a sex effect is in agreement with other studies that examined the influence of acute hypoxia on cardiorespiratory responses and performance (Elliot and Atterbom 1978;Muza et al 2001;Wagner et al 1979). As shown by Olfert et al (Olfert et al 2004), physical fitness level is more important than sex per se in determining whether or not pulmonary gas exchange impairments occur during exercise.…”

Section: 69supporting

confidence: 88%

Mountaineering experience decreases the net oxygen cost of climbing Mont Blanc (4,808 m)

Billat

Dupré

Karp³

et al. 2009

Eur J Appl Physiol

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The purpose of this study was to test the hypothesis that mountaineering experience decreases the net oxygen cost of uphill walking (OCw) on steep mountain trails and in ice and snow conditions. OCw was measured during an ascent of Mont Blanc in eight experienced alpinists and eight non-alpinists who were matched for sex (4 + 4) and low-altitude aerobic power (V(O)(2)(max) 50-55 ml kg(-1) min(-1)). Subjects carried a breath-by-breath gas exchange analyzer and a GPS. V(O)(2)(max) at altitude was estimated from measured low-altitude V(O)(2)(max) using Bassett's equation to calculate fractional use of V(O)(2)(max) during the ascent (FV(O)(2)(max)). OCw was calculated as the difference between V(O)(2) while climbing minus resting V(O)(2). At all elevations, Alpinists exhibited a lower OCw (P < 0.01). In all subjects, OCw increased when encountering ice and snow conditions. FV(O)(2)(max) remained stable around 75% at all elevations independent of experience or sex. In conclusion, the OCw is lower in experienced mountaineers compared to non-experienced subjects, and increases when going from steep rocky mountain terrain to ice and snow conditions, independent of mountaineering experience or sex.

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“…Direct observations in a study of females indicated a 26.7% decrement of VO 2max at 4100 m. 15 In another study, a 24% reduction of VO 2max in females compared with a 29.5% reduction in males at 4500 m altitude was reported. 6 Elliott and Atterbom 16 observed a similar decrement (18%) of VO 2max in both sexes at 3962 m altitude.…”

Section: Discussionmentioning

confidence: 72%