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

Neto GR, Santos HH, Sousa JB, Júnior AT, Araújo JP, Aniceto RR, Sousa MS - J Hum Kinet (2014)

Bottom Line: Strength training combined with blood flow restriction (BFR) have been used to improve the levels of muscle adaptation.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.

View Article: PubMed Central - PubMed

Affiliation: 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.

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.

No MeSH data available.


Related in: MedlinePlus

Percentage change in the sEMG amplitude in a MVIC for knee′s three extensor muscles NFR = without Blood Flow Restriction; WFR = With Blood Flow Restriction; RF - Rectus femoris; VL - Vastus lateralis; VM - Vastus Medialis; Average values and standard error
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f3-jhk-41-163: Percentage change in the sEMG amplitude in a MVIC for knee′s three extensor muscles NFR = without Blood Flow Restriction; WFR = With Blood Flow Restriction; RF - Rectus femoris; VL - Vastus lateralis; VM - Vastus Medialis; Average values and standard error

Mentions: The sEMG signal was normalized by the peak during a MVIC. During the intergroup analysis, both conditions (WFR and NFR) showed no significant changes in sEMG amplitude during the course of a MVIC right after the squats series. The grade of muscle activation of the RF, VL and VM of subjects who underwent effort in the NFR group did not change in comparison to the pre-exercise condition (p > 0.05); in the WFR group, only VL showed significant reduction in signal activation (p = 0.049), as shown in Table 1. In intergroup comparison (Figure 3), changes in the sEMG amplitude signal were not significant (p > 0.05).


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

Neto GR, Santos HH, Sousa JB, Júnior AT, Araújo JP, Aniceto RR, Sousa MS - J Hum Kinet (2014)

Percentage change in the sEMG amplitude in a MVIC for knee′s three extensor muscles NFR = without Blood Flow Restriction; WFR = With Blood Flow Restriction; RF - Rectus femoris; VL - Vastus lateralis; VM - Vastus Medialis; Average values and standard error
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4120450&req=5

f3-jhk-41-163: Percentage change in the sEMG amplitude in a MVIC for knee′s three extensor muscles NFR = without Blood Flow Restriction; WFR = With Blood Flow Restriction; RF - Rectus femoris; VL - Vastus lateralis; VM - Vastus Medialis; Average values and standard error
Mentions: The sEMG signal was normalized by the peak during a MVIC. During the intergroup analysis, both conditions (WFR and NFR) showed no significant changes in sEMG amplitude during the course of a MVIC right after the squats series. The grade of muscle activation of the RF, VL and VM of subjects who underwent effort in the NFR group did not change in comparison to the pre-exercise condition (p > 0.05); in the WFR group, only VL showed significant reduction in signal activation (p = 0.049), as shown in Table 1. In intergroup comparison (Figure 3), changes in the sEMG amplitude signal were not significant (p > 0.05).

Bottom Line: Strength training combined with blood flow restriction (BFR) have been used to improve the levels of muscle adaptation.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.

View Article: PubMed Central - PubMed

Affiliation: 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.

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.

No MeSH data available.


Related in: MedlinePlus