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gchalmers50
03-23-2004, 07:16 AM
Charles,
I don't see a problem of using the isometric contraction to normalize
the non-isometric contraction. But you should be aware of the
possibility that you can get an EMG level during the dynamic contraction
that is >100% of the EMG level during a maximum isometric contraction
(so don't think that such an observation is a mistake). This was
observed in references 1 & 2, and mentioned as the Hof 1984 reference on
pg 374 of ref #3. Reference #4 is a potentially useful article on this
normalization topic.

GC

1: Swanson SC, Caldwell GE.
An integrated biomechanical analysis of high speed incline and level
treadmill
running.
Med Sci Sports Exerc. 2000 Jun;32(6):1146-55.
PMID: 10862544 [PubMed - indexed for MEDLINE]

2: Jacobs R, van Ingen Schenau GJ.
Intermuscular coordination in a sprint push-off.
J Biomech. 1992 Sep;25(9):953-65.
PMID: 1517272 [PubMed - indexed for MEDLINE]

3: Kamen G, Caldwell GE.
Physiology and interpretation of the electromyogram.
J Clin Neurophysiol. 1996 Sep;13(5):366-84. Review.
PMID: 8897204 [PubMed - indexed for MEDLINE]

4: Yang JF, Winter DA.
Electromyographic amplitude normalization methods: improving their
sensitivity
as diagnostic tools in gait analysis.
Arch Phys Med Rehabil. 1984 Sep;65(9):517-21.
PMID: 6477083 [PubMed - indexed for MEDLINE]



************************************************** ******************
Gordon Chalmers, Ph.D.
Dept. of Physical Education, Health and Recreation
Western Washington University
516 High St.
Bellingham, WA, U.S.A.
98225-9067
http://www.ac.wwu.edu/~chalmers/
Phone: 360-650-3113
Email: Gordon-dot-Chalmers-at-wwu-dot-edu
in above email address: replace "-dot-" with "."
replace "-at-" with "@"


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