Key result
Increased muscle strength and hypertrophy following 6 weeks of concentric blood flow-restricted training were well preserved after 6 weeks of detraining, whereas eccentric training produced no significant changes.
Why the study?
Does detraining after concentric vs eccentric blood flow-restricted training affect muscle size and strength in young men?
RCT (n=10)
Randomized within-subject
No
Does detraining after concentric vs eccentric blood flow-restricted training affect muscle size and strength in young men?
Increased muscle strength and hypertrophy following 6 weeks of concentric blood flow-restricted training are well preserved after 6 weeks of detraining.
Concentric BFR gains may persist after short detraining in young men; leaves open eccentric protocols and clinical translation.
We investigated the effects of 6 weeks of detraining on muscle size and strength in young men who had previously participated in 6 weeks (3 days/week) of 30 % of concentric one-repetition maximal (1-RM) dumbbell curl training [one arm: concentric blood flow restricted (BFR) exercise (CON-BFR); the other arm: eccentric BFR exercise (ECC-BFR)]. MRI-measured muscle cross-sectional area (CSA) at 10 cm above the elbow joint increased from pre to post (p < 0.01), and the muscle CSA following detraining remained greater than pre (p < 0.01) but was similar to that observed at post. Maximal voluntary contraction (MVC) increased from pre to post (p < 0.05), and the MVC following detraining remained greater than pre (p < 0.05) but was similar to that observed at post. The ECC-BFR did not produce any changes across time. Increased muscle strength following 6 weeks of CON-BFR was well preserved at 6 weeks of detraining, which may be primarily related to muscle hypertrophy.
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Yasuda et al. (2014) conducted an RCT in Healthy (n=10). Concentric blood flow-restricted (CON-BFR) training followed by detraining vs. Eccentric blood flow-restricted (ECC-BFR) training followed by detraining was evaluated on Muscle cross-sectional area (CSA) at 10 cm above the elbow joint across time (p=0.034). Increased muscle strength and hypertrophy following 6 weeks of concentric blood flow-restricted training were well preserved after 6 weeks of detraining, whereas eccentric training produced no significant changes.
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