Blood Flow Restriction during Low-Intensity Resistance ??

[terraj]

Who has tried method? Or even has a take on it?

I hooked up with personal trainer today and he talked me into giving it a go. So I did my heavy stuff, put the straps on did two more exercises with high reps....the pump was unreal!

A concern I would have about blood flow restriction is blood pressure, especially if on a cycle.



http://jap.physiology.org/cgi/reprint/00195.2007v1

J Appl Physiol. 2007 Jun 14

Blood Flow Restriction during Low-Intensity Resistance Exercise Increases S6K1 Phosphorylation and Muscle Protein Synthesis.

Fujita S, Abe T, Drummond MJ, Cadenas JG, Dreyer HC, Sato Y, Volpi E, Rasmussen BB.

Internal Medicine, University of Texas Medical Branch, Galveston, Texas, United States; Human and Engineered Environment, Graduate School of Frontier Sciences, University of Tokyo, Tokyo, Texas, Japan.

Low-intensity resistance exercise training combined with blood flow restriction (REFR) increases muscle size and strength as much as conventional resistance exercise with high-loads. However, the cellular mechanism(s) underlying the hypertrophy and strength gains induced by REFR are unknown. We have recently shown that the mTOR signaling pathway is involved in the increase in muscle protein synthesis after an acute bout of high-intensity resistance exercise in humans. Therefore, we hypothesized that an acute bout of REFR would enhance mTOR signaling and stimulate muscle protein synthesis (MPS). We measured MPS and phosphorylation status of mTOR-associated signaling proteins in 6 young male subjects. Subjects were studied once during blood flow restriction (REFR, bilateral leg extension exercise at 20% of 1-RM while a pressure cuff was placed on the proximal end of both thighs and inflated at 200mmHg) and a second time using the same exercise protocol but without the pressure cuff (CTRL). MPS in the vastus lateralis muscle was measured by using stable isotope techniques and the phosphorylation status of signaling proteins were determined by immunoblotting. Blood lactate, cortisol, and growth hormone were higher following REFR as compared to CTRL (P<0.05). S6K1 phosphorylation, a downstream target of mTOR, increased concurrently with a decreased eEF2 phosphorylation and a 46% increase in MPS following REFR (P<0.05). MPS and S6K1 phosphorylation were unchanged in the CTRL group post-exercise. We conclude that the activation of the mTOR signaling pathway appears to be an important cellular mechanism which may help explain the enhanced muscle protein synthesis during REFR. Key words: mTOR , ischemia, hypertrophy, protein metabolism, post-exercise recovery.

[BJJ]

Interested too.

I also experienced the same.

[NC600cbr]

Interesting theory to say the least. I'd be interested to see more studies.

[terraj]

Douglas Robb at HealthHabits posted the other day about the Occlusion/Kaatsu training method, which is popular in Japan. While not necessarily useful to me, I found it a very interesting read.


Kaatsu Training / Occlusion Training

What Kaatsu Training Does
Kaatsu training looks like it can increase muscle hypertrophy significantly more than regular resistance training over an extremely short period of time. In fact the results of the studies show that 2 weeks of Kaatsu training increases muscle mass to a higher degree than 5 weeks of regular resistance training.




The Definition of Occlusion
In medical terms, occlusion is the act of occluding or the state of being occluded; a shutting off or obstruction of something; a blocking of the central passage of one reflex by the passage of another.

Kaatsu training applies occlusion by restricting blood flow to target muscle groups, also called Blood Flow Restriction, or BFR.

So, What is Kaatsu Training?
Kaatsu training involves applying a tourniquet or a tight wrap to the proximal portion of the target limb in order to fully or partially restrict blood flow for the duration of a low intensity exercise session.

The guidelines of Kaatsu training are as follows:

•Intensity is 20% of 1 rep max.
•Training frequency is twice a day, 6 days per week.
•The minimum duration of Kaatsu training is 2 weeks, for a total of 24 sessions in 14 days.
•At least 4 hours between sessions.
•Occlusion is maintained throughout the entire exercise session.
Why Kaatsu Training Works
The theory is that the metabolic buildup within the restricted muscles elicits a number of physiological changes including a significant rise in growth hormone, which is actually higher than that observed with higher intensity exercise. Isn’t that interesting?

The Studies
Several studies were performed using both the Kaatsu method and regular resistance training. The results of those experiments are shown in the table below.

Table 1: Training studies on the effects of high-intensity resistance training and low-intensity BFR training on skeletal muscle size and strength

Please see a more detailed version of this table in the PDF document linked at the bottom of this post.

Author
(Journal, Year) No. of Subj. Intensity
(reps x sets) Weekly
Freq. Weeks /
Sessions M-size
% Change Session
% Change
High-intensity Resistance Training
Akima et al. (MSSE, 1999) 7 Max
5 x 10 4/5 2 / 9 2.8 0.31
Seynnes et al. (JAP, 2006) 7 Max
7 x 4 2/3 5 / 13 5.0 0.36
Tesch et al. (Acta, 2004) 10 Max
7 x 4 2/3 5 / 13 6.0 0.50
Bell et al. (JSMPF, 1992) 16 Max
20 x 3 4 5 / 20 5.3 0.27
Wilkinson et al. (EJAP, 2006) 10 80-90%
6-10 x 3-4 3 8 / 24 5.4 0.23
Jones et al. (JP, 1987) 12 80%
6 x 4 3 12 / 36 5.0 0.14
Ahtiainen et al. (EJAP, 2003) 16 10RM
all-out x 5 2 21 / 42 4.7 0.11
Low-intensity BFR Training (training frequency: twice per day)
Abe et al. (IJKTR, 2005) 8 20%
30&15 x 3 12 2 / 24 7.7 0.32
T. Fujita et al. 8 20%
30&15 x 3 12 1 / 12 3.0
3.5 0.25 (MV)
0.29 (CSA)

Key: M-size, muscle size; CSA, cross-sectional area; MV, muscle volume.

Conclusion
•Traditional resistance training performed 2-3 times per week causes muscle hypertrophy in about 5 weeks after roughly 10-15 training sessions.
•After the completion of the Kaatsu training study by T. Fujita et al. (see Table 1) with both a Blood Flow Restricted (BFR) group and a control group, significant muscle hypertrophy was observed only in the BFR group as the CSA and MV both increased.
•The resulting hypertrophic potential per session is similar to traditional high-intensity training.
•1-RM strength in the BFR group increased slightly due to increased muscle mass, although relative strength (1-RM/CSA) stayed the same.
•Muscle damage normally associated with resistance training was not apparent in either group, as measured by blood levels of creatine kinase, myoglobin, and interleukin-6.
•BFR training did not produce any signs of blood clotting.
•Changes in muscle mass following 7-days (12 sessions) of low-intensity resistance training using BFR resulted in effects comparable to that of several weeks of high-intensity resistance training.
•Changes in muscle mass following 14-days (24 sessions) of low-intensity resistance training using BFR resulted in effects greater than those seen after several weeks of high-intensity resistance training.
•Kaatsu training produces changes in strength that are inferior to a resistance training program designed to maximize strength gains.
Should You Use Kaatsu Training?
I am almost tempted to say “Yes” based on the results of these studies, but in reality I know better. There are much better ways to train if you are a healthy person.

For bodybuilders, Kaatsu training appears to be an effective way to increase muscle mass… or you could just do 20 rep sets of breathing squats.

For powerlifters, the increased muscle mass could then be trained to maximize density and strength in program consisting of 2-3 weeks of Kaatsu training followed by 8-12 weeks of powerlifting. Don’t tell Louie Simmons that you are considering this though.

For Olympic lifters or sport-specific athletes, I don’t think Kaatsu training has much to offer you. Your best bet is to train for speed/strength and specific functionality. The increased muscle mass would probably be more of a hindrance.

For novice or intermediate athletes who really only exercise for fun or to stay healthy, Kaatsu training probably doesn’t have a place in your workout routine unless you want to worry about wearing really tight wraps or tourniquets while you exercise.

[Gambolputty]

I have been experimenting with this. I can't get my work schedule to allow twice daily or more that 2 or 3 workouts a week which is fine as it takes some practice to get the wraps equally and consistently tight before each set of exercises.