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J Hum Kinet. 2014 Jul 8;41:163-72. doi: 10.2478/hukin-2014-0044. eCollection 2014 Jun 28.

Effects of high-intensity blood flow restriction exercise on muscle fatigue.

Author information

1
Kinanthropometry and Human Development Laboratory - LABOCINE -UFPB, João Pessoa / PB, Brazil. ; Federal University of Rio de Janeiro. Physical Education - Graduate Program. Rio de Janeiro, RJ - Brazil.
2
Kinanthropometry and Human Development Laboratory - LABOCINE -UFPB, João Pessoa / PB, Brazil.
3
Kinanthropometry and Human Development Laboratory - LABOCINE -UFPB, João Pessoa / PB, Brazil. ; Associate Programme on Graduate Program in Physical Education UPE / UFPB, João Pessoa, Paraíba, Brazil.
4
Kinanthropometry and Human Development Laboratory - LABOCINE -UFPB, João Pessoa / PB, Brazil. ; Graduate Program in Physical Education of University Trás-os-Montes e Alto Douro - UTAD - Vila Real/Portugal.
5
Kinanthropometry and Human Development Laboratory - LABOCINE -UFPB, João Pessoa / PB, Brazil. ; Associate Programme on Graduate Program in Physical Education UPE / UFPB, João Pessoa, Paraíba, Brazil. ; Laboratory of Kinesiology and Biomechanics - LACIB, Integrated Colleges of Patos, Paraíba, Brazil.

Abstract

Strength training combined with blood flow restriction (BFR) have been used to improve the levels of muscle adaptation. The aim of this paper was to investigate the acute effect of high intensity squats with and without blood flow restriction on muscular fatigue levels. Twelve athletes (aged 25.95 ± 0.84 years) were randomized into two groups: without Blood Flow Restriction (NFR, n = 6) and With Blood Flow Restriction (WFR, n = 6) that performed a series of free weight squats with 80% 1-RM until concentric failure. The strength of the quadriceps extensors was assessed in a maximum voluntary isometric contraction integrated to signals from the surface electromyogram. The average frequency showed significant reductions in the WFR group for the vastus lateralis and vastus medialis muscles, and intergroup only for the vastus medialis. In conclusion, a set of squats at high intensity with BFR could compromise muscle strength immediately after exercise, however, differences were not significant between groups.

KEYWORDS:

athletes; quadriceps; resistance training; vascular occlusion

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