| PEAK AND END RANGE ECCENTRIC EVERTOR/CONCENTRIC INVERTOR MUSCLE STRENGTH
RATIOS IN CHRONICALLY UNSTABLE ANKLES: COMPARISON WITH HEALTHY INDIVIDUALS |
Yavuz Yildiz 1 , Taner Aydin 1, Ufuk Sekir2, Bulent
Hazneci 3, Mahmut Komurcu 4 and Tunc
Alp Kalyon 1,3 |
1 Department of Sports Medicine, Gulhane Military Medical
Academy, Ankara, Turkey
2 Department
of Sports Medicine, Medical Faculty of Uludag Univeristy, Bursa, Turkey
3 Department
of Physical Medicine and Rehabilitation, Gulhane Military Medical Academy,
Ankara, Turkey
4 Department of Orthopaedic Surgery and Traumatology, Gulhane
Military Medical Academy, Ankara, Turkey
| Received |
|
25 May 2003 |
| Accepted |
|
10 June
2003
|
| Published |
|
01 September 2003 |
©
Journal of Sports Science and Medicine (2003) 2, 70-76
Search
Google Scholar for Citing Articles
The
aim of this study was to evaluate the alterations in eccentric evertor/concentric
invertor strength ratio and their importance in the chronically unstable
ankle. Eight patients with chronic ankle instability (CAI) and nine healthy individuals
participated in this study. Isokinetic concentric and eccentric
invertor and evertor muscle strength measurement was carried out at an angular
velocity of 120°·sec-1 by measuring maximal force moments (torque)
during isokinetic ankle inversion and eversion movements. Functionally,
evertor/invertor muscle strength ratios (E/I strength ratio) were calculated
separately based on peak moment and angle-specific moments obtained at 0°, 5°, 10°, 15°, 20° ankle joint angles.
Peak and angle-specific eccentric evertor strength
values at 0°, 5°, 10°, 15°, 20° were significantly lower in the chronic
ankle instability (CAI) group. In spite of this, no differences were obtained
for peak and angle-specific concentric invertor torque values. Eccentric
evertor/concentric invertor strength (Eecc/Icon) ratios
were also significantly lower in the CAI group, but only at 15° and 20°. Eccentric evertor muscle torque and end
range (15°-20°) Eecc/Icon strength ratio for the chronically
unstable ankle were significantly different from those for the healthy ankle.
For this reason, measurements of end range eccentric/concentric strength
ratios are more valuable in monitoring chronic ankle injuries and rehabilitation
should include not only concentric muscle strengthening but also eccentric
muscle strengthening, particularly for the evertor muscles.
KEY WORDS: Unstable ankle, strength ratios, eccentric
evertor, concentric invertor
|
|