Efeito do pré-condicionamento isquêmico na resistência isométrica de preensão manual em adultos
Effect of ischemic preconditioning on isometric handgrip strength in adults
DOI:
https://doi.org/10.11606/issn.1981-4690.2024e38220126Keywords:
Exercise, Isometric contraction, Ischemia, Blood pressureAbstract
Ischemic Preconditioning (IPC), also known as ischemia-reperfusion maneuver, is a technique applied via a pressure cuff on the thigh or arm. Studies show the effect of Local Ischemic Preconditioning (LIPC) on isotonic contractions in some sports modalities, but the effect of LPIC on isometric contraction in handgrip exercise is not known in the literature. The objective of this study was to compare the effects of LIPC and SHAM on Isometric Contraction Time (ICT) and the behavior of hemodynamic variables during isometric handgrip exercise in physically active adults. Thirteen volunteers aged 18 to 30 (22,2±1,7) years, who were physically active with a minimum of six months of resistance training experience, were selected. LIPC was performed on the dominant arm in three cycles of five minutes of cuff inflation to 200 mmHg, followed by five minutes of reperfusion, while the SHAM session was similar but with the cuff inflated to only 20 mmHg. ICT was assessed using a digital dynamometer (EMG System® TRF Man model), and the data were recorded using a biological data acquisition system (Windaq Pro, DATAQ Instruments) for subsequent analysis. ICT was defined as the time from the start of isometry at 40% of the maximal voluntary contraction until a 50% decrease in target force. Heart rate, systolic blood pressure, diastolic blood pressure, and mean arterial pressure were monitored (Dixtal 2023) throughout the experimental protocol. ICT was similar between the LIPC and SHAM sessions (141.0±41.6 vs. 144.9±50.0 seconds, p=0.89, respectively). Furthermore, there were no significant differences in hemodynamic responses between the sessions. Therefore, LIPC did not alter ICT and did not affect hemodynamic responses when compared to the SHAM session in physically active adults.
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