Having only read the abstract you linked to:
Research is a funny thing. The easiest thing in the world is to read the last line and take that as the gospel. However, you can view the research with a critical eye and apply the information. The rest of the abstract has a few interesting points:
1. Small sample size of "elite" (who's to say that college soccer are elite?) athletes: can we transfer this research to all user groups?
2. What were their normal conditioning exercises that the experiment supplemented?
2.5. What exercises did they do in the experiment?
3. Were the control and experimental groups controlled for workload? IE. did each group lift as much as they were able to... which would mean the flat grounded controls would lift more weight than the UST experimentals OR was their resistance dictated to them.
4. "Inflatable rubber disks" are probably Dynadiscs, which are incredibly different from a BOSU.
5. Their choice of performance tests is based upon power and speed. Although people label a T-Test as agility IMO its more speed dominant than agility.
So what can we learn from this?
I think the number 1 flaw in the design of the study is that the performance measures they chose did nothing to measure the gains by using the UST. That's like saying that doing squats do not improve strength when all you measure is how many bicep curls you can do. Maybe better measures would have been bilateral weight distribution. Maybe they should have done EMG studies to see alterations in muscle activation. Maybe they could have looked at ankle / knee / hip stability... The things training with UST are meant to achieve.
Training for stability is not likely to improve strength based performance in individuals with a certain amount of base strength to begin with. Why? To get strong, you must lift heavy things. When you squat, you can lift heavy things. When you squat on a UST, you must reduce the load. Obviously this will impair strength development. Once that's obvious you can understand why that would decrease strength based performance measures.
The dynadisc pillows it sounds like they are using are in a sense more challenging that a BOSU. I can see them limiting the amount lifted drastically. A BOSU, however, is a fairly stable platform. I'd say that training on it would be more similar to "regular training" due to the ability to lift a decent amount of weight on it.
In regard to butterscotch: The BOSU squats he's doing are in addition to other strength movements. I do not think that they will hamper his performance in the least.
The mantra of crossfit is "If we think of something really hard to do, it must make us better.... right?".
Therefore, crossfitters should embrace doing everything on the BOSU
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