Corbett, J, Tipton, MJ, Perissiou, M, James, T, Young, JS, Newman, A, Cummings, M, Montgomery, H, Grocott, MPW and Shepherd, AI (2023) Effect of different levels of acute hypoxia on subsequent oral glucose tolerance in males with overweight: A balanced cross-over pilot feasibility study. Physiological Reports, 11 (9).

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Abstract

Previous research has shown that ≤60 min hypoxic exposure improves subsequent glycaemic control, but the optimal level of hypoxia is unknown and data are lacking from individuals with overweight. We undertook a cross-over pilot feasibility study investigating the effect of 60-min prior resting exposure to different inspired oxygen fractions (CON FIO2 = 0.209; HIGH FIO2 = 0.155; VHIGH FIO2 = 0.125) on glycaemic control, insulin sensitivity, and oxidative stress during a subsequent oral glucose tolerance test (OGTT) in males with overweight (mean (SD) BMI = 27.6 (1.3) kg/m2; n = 12). Feasibility was defined by exceeding predefined withdrawal criteria for peripheral blood oxygen saturation (SpO2), partial pressure of end-tidal oxygen or carbon dioxide and acute mountain sickness (AMS), and dyspnoea symptomology. Hypoxia reduced SpO2 in a stepwise manner (CON = 97(1)%; HIGH = 91(1)%; VHIGH = 81(3)%, p < 0.001), but did not affect peak plasma glucose concentration (CON = 7.5(1.8) mmol∙L−1; HIGH = 7.7(1.1) mmol∙L−1; VHIGH = 7.7(1.1) mmol∙L−1; p = 0.777; η2 = 0.013), plasma glucose area under the curve, insulin sensitivity, or metabolic clearance rate of glucose (p > 0.05). We observed no between-conditions differences in oxidative stress (p > 0.05), but dyspnoea and AMS symptoms increased in VHIGH (p < 0.05), with one participant meeting the withdrawal criteria. Acute HIGH or VHIGH exposure prior to an OGTT does not influence glucose homeostasis in males with overweight, but VHIGH is associated with adverse symptomology and reduced feasibility.

Item Type:	Article
Uncontrolled Keywords:	altitude; diabetes; metabolic disease; environmental stress; reduced oxygen; Humans; Dyspnea; Insulin Resistance; Acute Disease; Altitude Sickness; Oxygen; Glucose; Blood Glucose; Glucose Tolerance Test; Feasibility Studies; Altitude; Male; Overweight; Hypoxia; altitude; diabetes; environmental stress; metabolic disease; reduced oxygen; Male; Humans; Glucose Tolerance Test; Feasibility Studies; Blood Glucose; Insulin Resistance; Overweight; Hypoxia; Altitude Sickness; Oxygen; Acute Disease; Glucose; Dyspnea; Altitude; Diabetes; Clinical Research; Male; Humans; Glucose Tolerance Test; Feasibility Studies; Blood Glucose; Insulin Resistance; Overweight; Hypoxia; Altitude Sickness; Oxygen; Acute Disease; Glucose; Dyspnea; Altitude; 0606 Physiology; 1103 Clinical Sciences; 1116 Medical Physiology
Subjects:	R Medicine > RC Internal medicine > RC1200 Sports Medicine
Divisions:	Sport and Exercise Sciences
Publisher:	Wiley
SWORD Depositor:	A Symplectic
Date Deposited:	17 Dec 2024 12:58
Last Modified:	17 Dec 2024 13:00
DOI or ID number:	10.14814/phy2.15623
URI:	https://researchonline.ljmu.ac.uk/id/eprint/25110

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