Abstract
Abstract Aim: To investigate the neuromuscular fatigue and recovery after an intermittent isometric handgrip exercise (IIHE) executed until failure with different blood flow restriction (BFR) conditions (free flow, partial and total vascular restriction). Methods: Thirteen healthy men carried out an IIHE at 45% of maximum voluntary isometric force (MVIF) until failure with total restriction (TR), partial restriction (PR) or free flow (FF). The rate of force development (RFD) was extracted from the MIVF over the time intervals of 0-30, 0-50, 0-100, and 0-200ms and normalized by MVIF [relative RFD (RFDr)]. Results: The RFDr decreased significantly (p<0.01) after the IIHE in all BFR conditions and time intervals studied, remaining lower for five minutes. The medians of the RFDr in FF condition were significantly lower (p=0.01) at 30ms (1.56 %MVIF·s-1) and 50ms (1.70 %MVIF·s-1) when compared to TR at 30ms (2.34 %MVIF·s-1) and 50ms (2.63 %MVIF·s-1) in minute 1 post failure. Conclusions: These results show that, regardless of the blood flow restriction level, there is no RFD recovery five minutes after an exhaustive IIHE. When the task was executed with FF, the reduction of the RFD was greater when compared with the TR condition.
Highlights
Blood flow during a muscle effort is continuously controlled to ensure nutrient and oxygen support, as well as the metabolites withdrawal from the exercised muscles, allowing an optimal muscle performance and recovery[1]
Blood flow restriction (BFR) during muscle efforts has been used in training routines with promising gains in muscle strength and mass[2,3]
blood flow restriction (BFR) induces many metabolic/hormonal/neural acute responses associated with positive muscle adaptations[4], but obligate an earlier task failure (TF), especially when higher BFR pressures are applied during the exercise[5]
Summary
Blood flow during a muscle effort is continuously controlled to ensure nutrient and oxygen support, as well as the metabolites withdrawal from the exercised muscles, allowing an optimal muscle performance and recovery[1]. Blood flow restriction (BFR) during muscle efforts has been used in training routines with promising gains in muscle strength and mass[2,3]. The knowledge regarding the mechanisms involved in the TF induced by BFR during muscle efforts has not been widely explored. TF is defined as the inability to keep performing a requested task. It has specific mechanisms, involving central and peripheral factors, which depends on task characteristics[7,8]. Some neuromuscular parameters have allowed the investigation of neural and muscular factors contribution to muscle force development in fatigue or TF contexts, as the rate of force development (RFD)[13]
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