Affiliations: [a] Department of Biomechanics, Faculty of Physical Therapy, Cairo University, Giza, Egypt | [b] Department of Physical Therapy, Collage of Applied Medical Sciences, Majmaah University, Saudi Arabia | [c] Physical Therapy Department for Musculoskeletal Disorder and Its Surgery, Faculty of Physical Therapy, Cairo University, Giza, Egypt
Correspondence:
[*]
Corresponding author: Walaa S. Mohammad, Department of Biomechanics, Faculty of Physical Therapy, Cairo University. 7 Ahmed Elziat Street, Bean Elsariate, Giza, Egypt. Tel.: +20 1009 127072; E-mail:walaa.sayed@pt.cu.edu.eg
Abstract: BACKGROUND AND OBJECTIVE: The moment generated by a muscle is
influenced, among other factors, by the angular velocity and the testing
position. However, the effect of these factors on hip muscles'
agonist/antagonist ratios is not well understood. The main purpose of this
study was to analyze this effect in a group of apparently healthy women and
men. METHODS: Sixteen women and 24 men, aged 21-25 years participated in
this study. The isokinetic concentric hip flexor/extensor (F/E) and
adductor/abductor (AD/AB) strength ratios were calculated based on testing
in supine and standing positions for the flexors and extensors) and
side-lying and standing positions (for the adductors and abductors) tested
at 60 and 180°/s. RESULTS: For both genders the isokinetic moment of hip muscles
decreased with increased angular velocity and the highest moments were
observed in standing position. A significant interaction of position,
angular velocity, and gender was observed (p < 0.05), which indicated that
men experienced greater increases in F/E and AD/AB ratios in standing
position at 180°, whereas women demonstrated lower ratios in the same
position. CONCLUSION: Isokinetic tests of the hip muscles ratios: F/E and
AD/AB in standing and in sitting indicate that the test position and gender
have a significant effect on the test findings.
Keywords: Isokinetic, hip muscles, concentric moment, body position, angular velocity
