Medical Journal of the Islamic Republic Of Iran
مجله پزشکی جمهوری اسلامی ایران
Med J Islam Repub Iran
Medical Sciences
http://mjiri.iums.ac.ir
2
journal2
1016-1430
2251-6840
8
10.18869/mjiri
14
8888
13
en
jalali
1385
11
1
gregorian
2007
2
1
20
4
online
1
fulltext
en
Ankle musculature latency measurement to varing angles of sudden external oblique perturbation in normal functionally unstable ankles
Physical Therapy
Physical Therapy
Original Research
Original Research
<p> <strong>Abstract</strong></p><p> <strong>Background:</strong> Several studies have examined the reflex response of ankle musculature to sudden inversion in noninjured and injured subjects. To date, there have been no studies to determine the effect of versatile degrees & conditions of perturbation on the ankle musculature latency. The purpose of this study was to measure and determine whether there was a difference in ankle musculature latency measurements at 10°, 20°, and 30° in the oblique plane on a dual tilting platform (APS) between normal and functionally unstable ankles under different conditions of perturbation.</p><p> <strong>Methods:</strong> The musculature latency of 15 healthy subjects (8 females, 7 males age range, 18 to 30 years) and 15 patients with functional ankle instability (FAI) (8 females, 7 males age range, 18 to 30 years) were examined with surface EMG after sudden inversion of the ankle by APS.</p><p> <strong>Results:</strong> In all angles of the oblique plane, the latency of Peroneus longus, Tibialis anterior, Peroneus brevis, and Soleus were significantly longer in subjects with unstable ankles under expected and unexpected conditions. Unexpected conditions led to increase the latency of ankle musculature, both for normal and functionally unstable ankles.</p><p> <strong>Conclusion:</strong> The significantly longer onset and peak latency of ankle musculature during sudden inversion in the standing position in subjects with unstable ankles is explained by proprioceptive deficit in sensorimotor control of functionally unstable ankles. Unexpected external perturbations of body equilibrium elicit compensatory postural reflexes which cause longer latency of ankle musculature during varying angles of perturbation.</p>
Latency, Oblique Perturbation, Functional Ankle Instability, EMG
166
174
http://mjiri.iums.ac.ir/browse.php?a_code=A-10-1-230&slc_lang=en&sid=1
B.
Akhbari
akhbari@uswr.ac.ir
20031947532846002398
20031947532846002398
Yes
Physiotherapy Department of University of Social Welfare & RehabilitationEvin, Daneshjoo,Blvd, Koodakyar Ave, University of Social Welfare and Rehabilitation ,Tehran, Iran.
I.
Ebrahimi Takamjani
20031947532846002399
20031947532846002399
No
Rehabilitation Faculty of Iran University of Medical Sciences, Mirdamad St, Madar Sq., Tehran, Iran
M.
Salavati
20031947532846002400
20031947532846002400
No
Physiotherapy Department of University of Social Welfare & Rehabilitation
H.
Farahini
20031947532846002401
20031947532846002401
No
Iran University of Medical Sciences, Hemmat Expressway, Tehran, Iran
M. A.
Sanjari
20031947532846002402
20031947532846002402
No
Rehabilitation Faculty of Iran University of Medical Sciences