Proper functioning of the ankle musculature, specifically peroneal muscles, is crucial for maintaining balance and reducing the risk for falls. Evidence suggests that a decrease in aspects of neuromuscular control already starts at midlife (45-65 years). However, there is almost no information regarding the function of the ankle muscles at the middle-age as most experiments have compared young (\<35 years) and older subjects (\>65 years). Moreover, neuromuscular training can improve the function of ankle muscle in response to perturbation; yet, no previous study has compared the level of effectiveness between middle-aged and young adults.
Study Type
OBSERVATIONAL
Enrollment
50
The exercise will be performed with the subject sitting in front of a computer monitor, on an elevated chair, and his feet will be in the air. The examiner will ask the subject to perform a maximum contraction of the paronal muscles, in an open kinematic chain. After reference, the subject will begin a five-minute practice. The practice will be divided into rounds of: eight seconds of muscle work and 15 seconds rest.
Ariel University -The Neuromuscular & Human performance laboratory
Ariel, Israel
RECRUITINGTime to stabilization
Subjects will be asked to jump from a 20 cm high box onto a force plate (i.e., expected fall).
Time frame: Within 24 hours
Electromyography of peroneus longus- "The height of the amplitude"- expected fall
Subjects will be asked to jump from a 20 cm high box onto a force plate (i.e., expected fall). electromyography of peroneus longus will be measured the height of the amplitude - expresses the peak of the electrical activity of the muscles.
Time frame: Within 24 hours
Electromyography of peroneus longus- "Time to Peak"- expected fall
Subjects will be asked to jump from a 20 cm high box onto a force plate (i.e., expected fall). electromyography of peroneus longus will be measured the "Time to Peak"- describes the time it takes for the Peroneus longus muscle to reach the peak of its electrical activity.
Time frame: Within 24 hours
Electromyography of peroneus longus- "Time to Onset"- expected fall
Subjects will be asked to jump from a 20 cm high box onto a force plate (i.e., expected fall). electromyography of peroneus longus will be measured the "Time to Onset" - expresses the period that passes from the beginning of the fall to the initial recruitment of the Peroneus longus.
Time frame: Within 24 hours
Electromyography of peroneus longus- "The height of the amplitude"-unexpected fall
Subjects will stand on a platform during a unilateral sudden 30° inversion platform perturbation that resembles an unexpected fall. electromyography of peroneus longus will be measured the "height of the amplitude" - expresses the peak of the electrical activity of the Peroneus longus muscle.
Time frame: Within 24 hours
Electromyography of peroneus longus- "Time to Peak"-unexpected fall
Subjects will stand on a platform during a unilateral sudden 30° inversion platform perturbation that resembles an unexpected fall. electromyography of peroneus longus will be measured the "Time to Peak"- describes the time it takes for the Peroneus longus muscle to reach the peak of its electrical activity.
Time frame: Within 24 hours
Electromyography of peroneus longus- "Time to Onset"-unexpected fall
Subjects will stand on a platform during a unilateral sudden 30° inversion platform perturbation that resembles an unexpected fall. electromyography of peroneus longus will be measured the "Time to Onset"- expresses the period that passes from the beginning of the fall to the initial recruitment of the Peroneus longos muscle.
Time frame: Within 24 hours
Maximal voluntary isometric peroneal contraction force
Subject will perform Maximal voluntary isometric peroneal contraction. The force will measured with dynamometer
Time frame: Within 24 hours
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