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- W2027365376 abstract "We investigated if the magnitude of the type 2 diabetes (T2D)-induced impairments in peak oxygen uptake (V̇o 2 ) and V̇o 2 kinetics was affected by age. Thirty-three men with T2D (15 middle-aged, 18 older), and 21 nondiabetic (ND) men (11 middle-aged, 10 older) matched by age were recruited. Participants completed four 6-min bouts of constant-load cycling at 80% ventilatory threshold for the determination of V̇o 2 kinetics. Cardiac output (inert-gas rebreathing) was recorded at rest and 30 and 240 s during two additional bouts. Peak V̇o 2 (determined from a separate graded test) was significantly ( P < 0.05) reduced in middle-aged and older men with T2D compared with their respective ND counterparts (middle-aged, 3.2 ± 0.5 vs. 2.5 ± 0.5 l/min; older, 2.7 ± 0.4 vs. 2.4 ± 0.4 l/min), and the magnitude of these impairments was not affected by age. However, the time constant of phase II of the V̇o 2 response was only slowed ( P < 0.05) in middle-aged men with T2D compared with healthy counterparts, whereas it was similar among older men with and without T2D (middle-aged, 26.8 ± 9.3 vs. 41.6 ± 12.1 s; older, 40.5 ± 7.8 vs. 41.1 ± 8.5 s). Similarly, the “gains” in systemic vascular conductance (estimated from the slope between cardiac output and mean arterial pressure responses) were lower ( P < 0.05) in middle-aged men with T2D than ND controls, but similar between the older groups. The results suggest that the mechanisms by which T2D induces significant reductions in peak exercise performance are linked to a slower dynamic response of V̇o 2 and reduced systemic vascular conductance responses in middle-aged men, whereas this is not the case in older men." @default.
- W2027365376 created "2016-06-24" @default.
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- W2027365376 date "2015-04-15" @default.
- W2027365376 modified "2023-10-18" @default.
- W2027365376 title "Differential effects of age and type 2 diabetes on dynamic vs. peak response of pulmonary oxygen uptake during exercise" @default.
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- W2027365376 doi "https://doi.org/10.1152/japplphysiol.01040.2014" @default.
- W2027365376 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/25701005" @default.
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