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Vernon Mcdonald
06-13-1994, 08:35 AM
I have a colleague here at JSC who is studying the effects of physical
activity on the development of decompression sickness (the bends). The
development of "bubbles" in the joint cavities is apparently influenced by
certain types of physical activity. For example those people who engaged
in locomotion or push-up's were more likely to develop the bends during
decompression than those who engaged in activities such as hand ergometer
exercise, turning a torque wrench, or a form of rowing (upper limbs only).
My colleague is trying to identify dimensions that separate these two
groups [locomotion or push-up's] vs. [hand ergometer exercise, turning a
torque wrench, or a form of rowing] relative to musculoskeletal dynamics.

I have asked him for details on the kinetics involved in each of the upper
body activities he used since there could be distinct power requirements.
However, it occurred to me that perhaps one difference is the necessity for
the maintenance of joint stability. An analogy is performance of the bench
press using a machine vs performance of the bench press using free weights.
In locomotion

Consequently I have two questions for this forum:

1) Has there been any research studying muscular activation patterns and
the role of joint "stabilizers" in various activities?

2) Do you have any other suggestions as to dimensions that separate these
two groups of physical activity.


As always I will post a summary of replies.



__________________________________________________ ______________
Vernon McDonald | Motor Performance Lab.
KRUG Life Sciences, | NASA/Johnson Space Center
TEL: (713)-244-6349 |
FAX: (713)-483-3058 | vmcdonald@plato.jsc.nasa.gov
__________________________________________________ ______________