Key result
Aerobic cycling with blood flow restriction reduces phase II VO2 kinetics time constant ~31% vs control.
Why the study?
It was unclear whether blood flow restriction accelerates the adaptation of the time constant of phase II VO2 kinetics in the moderate-intensity exercise domain via moderate-intensity aerobic training.
Does moderate-intensity aerobic cycle training with blood flow restriction accelerate the adaptation of VO2 kinetics in healthy participants?
RCT (n=18)
Randomly divided
No
Does moderate-intensity aerobic cycle training with blood flow restriction accelerate the adaptation of VO2 kinetics in healthy participants?
Absolute Event Rate: 15.3% vs 22.1%
p-value: p=<0.01
Adding blood flow restriction to moderate-intensity aerobic cycle training accelerates the adaptation of VO2 kinetics during the first 4 weeks of training in healthy young adults.
Accelerates early VO2 kinetics adaptation with moderate aerobic training in healthy adults; extends BFR evidence to submaximal protocols.
It is unclear whether blood flow restriction (BFR) accelerates the adaptation of the time constant (τ) of phase II oxygen uptake (VO2) kinetics in the moderate-intensity exercise domain via moderate-intensity aerobic training. Therefore, healthy participants underwent moderate-intensity [45–60% VO2 Reserve] aerobic cycle training with or without BFR (BFR group, n = 9; CON group, n = 9) for 8 weeks to evaluate VO2 kinetics during moderate-intensity cycle exercise before (Pre) and after 4 (Mid) and 8 (Post) weeks of training. Both groups trained for 30 min, 3 days weekly. BFR was performed for 5 min every 10 min by applying cuffs to the upper thighs. The τ significantly decreased by Mid in the BFR group (23.7 ± 2.9 s [Pre], 15.3 ± 1.8 s [Mid], 15.5 ± 1.4 s [Post], P < 0.01) and by Post in the CON group (27.5 ± 2.0 s [Pre], 22.1 ± 0.7 s [Mid], 18.5 ± 1.9 s [Post], P < 0.01). Notably, the BFR group’s τ was significantly lower than that of the CON group at Mid (P < 0.01) but not at Post. In conclusion, BFR accelerates the adaptation of VO2 kinetics at the onset of exercise by moderate-intensity aerobic training.
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Hori et al. (2022) conducted an RCT in Healthy young adults (n=18). Moderate-intensity aerobic cycle training with blood flow restriction (BFR) vs. Moderate-intensity aerobic cycle training without BFR was evaluated on Time constant (τ) of phase II oxygen uptake (VO2) kinetics at 4 weeks (p=<0.01). Moderate-intensity aerobic cycle training with blood flow restriction significantly reduced the time constant of phase II oxygen uptake kinetics at 4 weeks compared to control (15.3 vs 22.1 s, P<0.01).
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