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Rosi Raikova
01-18-2001, 02:57 PM
Dear colleagues,
I need for your opinion. The question is whether a strict terminology is
now accepted for the types of motor units (not muscle fibers), namely:
fast, slow, fast-fatigueable, fast fatigue - resistant.
I need also from data and references about the following muscles of the
upper human limb: biceps brachii, brachialis, brachioradialis, triceps
brachii and anconeus. The parameters of interest are: number of motor
units, percent of slow, fast, ... MU, maximal force per one MU, contraction
time; half relaxation time.
I were surprised obtaining very different values, even in a paper. For
example in Johnson et al., (1973), J. of the Neurological Sciences, vol.18,
the differences inbetween the cadaver specimens are very big - maximal
value of the percent of slow fibers in a subject is 58.2% , minimal - 20%.
I realize that these values depend on many factors. It will be enough to me
even to know which of the two elbow extensors (triceps or anconeus) is
faster.
Thank you for your help!
R.Raikova
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Assoc. Prof. Rositsa Todorova Raikova
CENTRE OF BIOMEDICAL ENGINEERING
BULGARIAN ACADEMY OF SCIENCES
Acad.G.Bonchev str., Bl.105
1113 Sofia, Bulgaria
tel. (+3592) 70 05 27
fax: (+3592) 72 37 87
E-mail: rosir@bgcict.acad.bg

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