|Pretty much the study set-up, albeit with a Scott bench to support the arm and much more weight.|
Well, I did. After reading the complete study and taking a look at previous research, however, I have admit that the scientists' conclusion that "BFR attenuated HI-ECC-induced muscle damage and there was no increase in cardiovascular responses" is warranted - even if I'd say that the last word on the real-world effect on gains has not been spoken, yet.
Let's first see, what the study looked like, though: Nine healthy men (26 +/- 1 years, BMI 24 +/- 1 kg m²) underwent unilateral elbow extension in two conditions: without (HI-ECC) and with BFR (HI-ECC+BFR). More specifically, all subjects performed single-arm Scott bench dumbbell biceps curls with both arms - once with, once without cuffs:
"The arms were randomly chosen to perform the exercise in one of the two conditions: without or with BFR (HI-ECC and HI-ECC+BFR conditions, respectively), and counterbalanced such that each condition included both dominant and non-dominant arms. For the experimental session, participants performed three sets of 10 repetitions of HI-ECC or HIECC+BFR (130% of 1RM) of unilateral elbow extension in the Scott bench using free weights (dumbbells)" (Curty 2017).The rest between sets was restricted to one minute, the cadence of eccentric action was 3 s between the initial position (elbow flexed) and full extension of the elbow, while the concentric action was performed passively by the staffs returning the dumbbell at the top of the movement so that only the eccentric action was performed. The experimental session with the contralateral arm was performed at the same day, after 30 min of rest.
|In contrast to its effects on endurance capacity, post-exercise blood flow restriction as it was practiced in a recent study by Madarame et al. does not enhance the longitudinal increase in strength or size (Madarame 2017).|
What I can tell you, though, is that Haruhiko Madarame and colleagues have shown just recently that postexercise blood flow restriction does not enhance muscle hypertrophy induced by multiple-set high-load resistance exercise. That's in contrast to the previously discussed results showing benefits on endurance performance with post-exercise cuffing, by the way.
- Curty, et al. "Blood flow restriction attenuates eccentric exercise-induced muscle damage without perceptual and cardiovascular overload." Clin Physiol Funct Imaging (2017).
- Damas, Felipe, et al. "Resistance training‐induced changes in integrated myofibrillar protein synthesis are related to hypertrophy only after attenuation of muscle damage." The Journal of physiology 594.18 (2016): 5209-5222.
- Madarame, et al. "Postexercise blood flow restriction does not enhance muscle hypertrophy induced by multiple-set high-load resistance exercise." Clin Physiol Funct Imaging (2017). Ahead of print.
- Nosaka, Kazunori, and Priscilla M. Clarkson. "Changes in indicators of inflammation after eccentric exercise of the elbow flexors." Medicine and science in sports and exercise 28.8 (1996): 953-961.
- Pearson, Stephen John, and Syed Robiul Hussain. "A review on the mechanisms of blood-flow restriction resistance training-induced muscle hypertrophy." Sports medicine 45.2 (2015): 187-200.