Abstract
In sedentary patients suffering of metabolic syndrome, we evaluated the effects of mild exercise program (EP) on the efficiency of the oxygen delivery system. The prescription of exercise (40min/session, 3 times/week) was tailored at workload corresponding to ∼90% individual anaerobic threshold (AT). EP improved significantly by ∼10% peak values of oxygen consumption (VO2) and heart rate (HR). Furthermore, in response to steady state workload at 90% AT, EP shortened the time constant of VO2, HR and the ratio VO2/HR (reflecting arterio-venous O2 concentration difference) by ∼6s. EP also decreased the elastic respiratory work due to a change in breathing pattern implying a larger contribution of respiratory rate, at the expense of tidal volume during exercise hyperventilation. In all subjects the perceived fatigue (Borg) decreased after training. This study supports a positive effect of a mild EP for the adaptive response of the oxygen chain to face metabolic needs compatible with daily life in patients affected by metabolic syndrome.
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