Effects of ischemic preconditioning on short-duration cycling performance.
It has been demonstrated that ischemic preconditioning (IPC) improves endurance performance. However, the potential benefits during anaerobic events and the mechanism(s) underlying these benefits remain unclear. Fifteen recreational cyclists were assessed to evaluate the effects of IPC of the upper thighs on anaerobic performance, skeletal muscle activation, and metabolic responses during a 60-s sprint performance. After an incremental test and a familiarization visit, subjects were randomly submitted in visits 3 and 4 to a performance protocol preceded by intermittent bilateral cuff inflation (4 × (5 min of blood flow restriction + 5 min reperfusion)) at either 220 mm Hg (IPC) or 20 mm Hg (control). To increase data reliability, each intervention was replicated, which was also in a random manner. In addition to the mean power output, the pulmonary oxygen uptake, blood lactate kinetics, and quadriceps electromyograms (EMGs) were analyzed during performance and throughout 45 min of passive recovery. After IPC, performance was improved by 2.1% compared with control (95% confidence intervals of 0.8% to 3.3%, P = 0.001), followed by increases in (i) the accumulated oxygen deficit, (ii) the amplitude of blood lactate kinetics, (iii) the total amount of oxygen consumed during recovery, and (iv) the overall EMG amplitude (P < 0.05). In addition, the ratio between EMG and power output was higher during the final third of performance after IPC (P < 0.05). These results suggest an increased skeletal muscle activation and a higher anaerobic contribution as the ultimate responses of IPC on short-term exercise performance.
['Cruz|Rogério Santos de Oliveira|RS|', 'de Aguiar|Rafael Alves|RA|', 'Turnes|Tiago|T|', 'Salvador|Amadeo Félix|AF|', 'Caputo|Fabrizio|F|']
D000328:Adult D054874:Athletic Performance D001642:Bicycling D015992:Body Mass Index D004032:Diet D004576:Electromyography D006801:Humans D019194:Ischemic Preconditioning D008297:Male D018482:Muscle, Skeletal D017711:Nonlinear Dynamics D010101:Oxygen Consumption D015424:Reperfusion D015203:Reproducibility of Results D013997:Time Factors D055815:Young Adult
ischemic preconditioning mean power output blood lactate kinetics accumulated oxygen deficit EMG de surface EPOC V̇O2 V̇O2 responses agent ergogène anaerobic exercise cinétique du lactate sanguin déficit accumulé d’oxygène ergogenic aid exercice anaérobie préconditionnement ischémique puissance moyenne sprint cycling sprint en cyclisme surface EMG