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View Full Version : Relationship between isokinetic peak torque and cross sectionalarea of quadriceps



Cheung Chi Kin
05-02-1998, 04:53 AM
Dear Colleague,
I am a freshman of this newsgroup. I hope that I will acquire much
knowledge from this newsgroup. I am a final year student in the department of
Sports Science and Physical Education in the Chinese University of Hong Kong.
My interest is biomechanics, sports psychology and other sports science
related topics. The following was my abstract of my final year project. The
topic of this study was "Relationship between isokinetic peak torque and cross
sectional area of thq quadriceps in sprinters and distance runners." I hope
that you can give me comment on this project after read it. Besides, if you
are intereting in the sports science researches or developmenet in Hong Kong,
please feel free to contact me. Thank you.

ABSTRACT


The purposes of this study were to determine (a) the relationship
between the isokinetic peak torque and cross sectional area (CSA) of the
quadriceps at angular velocities of 30* to 300*/sec and (b) the difference
between the sprinters and distance runners in isokinetic peak torque at each
angular velocity. Male sprinters, SP, (N=9) male distance runners, DR, (N=8),
and male students, CG , (N=19), who were sedentary, were recruited in CUHK as
subjects for this research. The cross sectional area of quadriceps (CSA) were
estimated using the anthropometric equation of Housh et al. (1995). The
isokinetic peak torque for leg extension (dominant leg) were determined at
60*, 120*, 180*, 240* and 300*sec-1 using the Cyber NormTM Testing and
Rehabilitation System. ANOVA and Correlation was used to measure the
difference and relationship between the isokinetic peak torque and CSA of
quadriceps among subject groups. SP demonstrated greater CSA than DR and CG.
The mean value in peak torque of SP were also significantly greater CG in all
testing velocity, while the significant difference between DR and CG could
only be found in 60*/sec, 120*/sec and 180*/sec. There were no correlation
between peak torque and body weight or lean body mass at all testing velocity
in all subject groups. Insignificant difference in peak torque per unit CSA
was found and there was no significant correlation between peak torque and
CSA. These results suggested that the difference between in peak torque among
subject group was came from muscle CSA, but muscle CSA is not a useful
predictive index of muscle strength.


Reference:
Housh, D. J., Housh, T. J., Weir, J. P., Weir, L. L. Johnson, G. O. and Stout,
J. R. (1995). Anthropometric estimation of thigh muscle cross-sectional area.
Medicine and Science in Sports and Exercise, 27(5), 784-791.

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