Abstract
The aim of the present study was to compare the effects of strength training (ST) with continuous or intermittent blood flow restriction (BFR) on the muscle hypertrophy (MH), dynamic muscle strength (DMS), isometric muscle strength (IMS) and localized muscular endurance (LME) of healthy men. Twenty-five men with experience in ST were randomly divided into 3 experimental groups: a) 4 low-load exercises at 20% of the one-repetition maximum (1RM) combined with continuous BFR (LL+CBFR), b) 4 low-load exercises at 20% of 1RM combined with intermittent BFR (LL+IBFR); and c) 4 low-load exercises at 20% of 1RM without BFR (LL). Twelve sessions of ST were performed (twice a week for 6 weeks). There were no differences between groups for all variables (p > 0.05). However, there were significant differences in time for the LME in the triceps pulley only in the LL+CBFR group (p < 0.001) and in the biceps pulley in the groups LL+CBFR, LL+IBFR and LL (p < 0.001, p = 0.002, p = 0.032), respectively, with large magnitudes only for the two forms of the BFR. It can be concluded that continuous or intermittent BFR seems to be a good alternative for the increase of the LME of the upper limbs in single-joint exercises.
Highlights
The comparative analysis of the circumference of the contracted right arm showed that there were no significant interactions between group x time (F = 0.066; ɳ2 = 0.003; p = 0.936), in the group (F = 2.011; ɳ2 = 0.084; p = 0.146) and time (F = 0.388; ɳ2 = 0.009; p = 0.536)
The comparative analysis of the circumference of the left contracted arm showed that there were no significant interactions between group x time (F = 0.023; ɳ2 = 0.001; p = 0.977), in the group (F = 2.029; ɳ2 = 0.084; p = 0.144) and time (F = 0.517; ɳ2 = 0.012; p = 0.476)
The comparative analysis of chest circumference showed that there were no significant interactions between group x time (F = 0.025; ɳ2 = 0.001; p = 0.975) and time (F = 0.096; ɳ2 = 0.002; p = 0.759); there were significant interactions in the group (F = 5.539, ɳ2 = 0.201, p = 0.007)
Summary
Seniors or people with special needs are less tolerant to high load percentages In this context, some researchers have used an ST method called KAATSU training, which consists of the use of low-loads (20-30% of 1RM) in combination with blood flow restriction (BFR) promoted through standard cuffs (Sato, 2005). Some researchers have used an ST method called KAATSU training, which consists of the use of low-loads (20-30% of 1RM) in combination with blood flow restriction (BFR) promoted through standard cuffs (Sato, 2005) This method has been used to increase muscle hypertrophy (Laurentino et al, 2012; Vechin et al, 2015), muscle strength (Laurentino et al, 2012; Silva et al, 2015; Vechin et al, 2015; Sousa et al, 2017) and localized muscle endurance (LME) (Kacin & Strazar, 2011; Gil et al, 2017; Sousa et al, 2017). It has been used to increase functional capacity (Araujo et al, 2015) and isometric force (Chaves et al, 2016) and has been shown to be safe in relation to hemodynamics (Araújo et al, 2014; Neto et al, 2015; 2016a; 2016b; Vilaça-Alves et al, 2016; Neto et al, 2017a; 2017b)
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