طريقة معدلة لتزامن التصوير الفيديوي الرقمي السريع ثلاثي الأبعاد مع جهاز تسجيل النشاط الكهربي للعضلات في مجال التحليل الحركي الرياضي

الملخص EN

The synchronization between high speed digital video camera (|HSDVC) and electromyography (EMG) signals is necessary to get to know what happens kinematically in general movement and especially in rapid ones during certain muscle activity signals.

Using EMG alone without the HSDVC being synced, muscle contraction type, movement phases, and rapid movement, can’t be determined.

Wired and wireless synch are two ways of synching HSDVC and EMG signals but the wired technique restrict the range of motion to the extent of wire length.

Limitations in most EMG units used in motion analysis labs in Egypt were noticed.

The unit fits with a slow frequency (30 HZ) digital camera that can only work with the EMG units and its software.

Even wireless device used in synchronization is confined only to this camera with the EMG device.

Thus several problems evoked.

The frequency of the camera doesn’t allow the analysis of rapid movement accurately in 2D, and 3D (if it is synched with additional HSDVC), reducing the efficiency of the EMG unit (10000 Hz).

In this study we were able of replacing the slow camera with a HSDVC (240 f/s) that is synched and tuned with the EMG unit using wireless broadcasting signal device.

In addition a 2nd HSDVC is added and synched with the 1st high speed one, using optical synchronization.

By this coincidence we were able of creating synchronization between both cameras (for a high speed digital video 3d analysis) and EMG device.

It was also noticed that the efficiency of the system was enhanced by 8 folds .