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2013 ; 222
(6
): 580-7
Nephropedia Template TP
gab.com Text
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English Wikipedia
Muscles within muscles: a tensiomyographic and histochemical analysis of the
normal human vastus medialis longus and vastus medialis obliquus muscles
#MMPMID23586984
Travnik L
; Djordjevi? S
; Rozman S
; Hribernik M
; Dahmane R
J Anat
2013[Jun]; 222
(6
): 580-7
PMID23586984
show ga
The aim of this study was to show the connection between structure (anatomical
and histochemical) and function (muscle contraction properties) of vastus
medialis obliquus (VMO) and vastus medialis longus (VML). The non-invasive
tensiomyography (TMG) method was used to determine the contractile properties
(contraction time; T(c)) of VML and VMO muscle, as a reflection of the ratio
between the slow and fast fibers in two groups of nine young men. VML and VMO
significantly (P?0.01) differ in the proportion of type 1 (59.6: 44%) and type
2b (6.3: 15%) fibers. The VML muscle is almost entirely composed of type 1 and
type 2a fibers. In many samples of this muscle no type 2b fibers were found. The
proportion of slow-twitch type 1 fibers is nearly twice as high as the proportion
of fast-twitch type 2a fibers. These observations indicate that VML is a slower
and more fatigue-resistant muscle than VMO muscle. These characteristics
correspond to the different functions of the VML, which is an extensor of the
knee, and to the VMO, which maintains the stable position of the patella in the
femoral groove. Our results obtained by TMG provided additional evidence that
muscle fibers within the segments of VM muscle were not homogenous with regard to
their contractile properties, thereby confirming the histochemical results. T(c)
can be attributed to the higher percentage of slow-twitch fibers - type 1. The
statistically shorter T(c) (P???0.001) of VMO (22.8?±?4.0 ms) compared with VML
(26.7?±?4.0 ms) in our study is consistent with previously found differences in
histochemical, morphological and electrophysiological data. In conclusion, the
results of this study provide evidence that the VML and VMO muscles are not only
anatomically and histochemically different muscles, but also functionally
different biological structures.