Development of the “Cuff-Y exerciser”
【Supercategory：7. DESCENTE SPORTS SCIENCE Subcategory：7.14 Vol.14】
Shoulder joint is the most movable joint in the body working as one of the shoulder complex and has reasonable stabilizing mechanisms which take great part in shoulder movement with delicate compensative function.
Especially, the mobility of the humeral head on the glenoid is controlled by the surrounding muscles of the joint. The adjustable system are divided into two groups which are outer muscles and inner muscles. Outer muscles work as a performance muscle concerning with speed and power and inner muscles make fulcrum of the motion. The balance of these two groups is the most important in the voluntary movement of the shoulder.
If the cuff dysfunction occurred, relatively increased power of outer muscles make the humeral head slip away from the glenoid. This recurrent abnormal movement should build up the wasting joint spreading the anatomical damage. Many authors reported the importance of the rehabilitation aiming to gain the function of rotator cuff and there were some papers describing the concrete examination program of the rotator cuff.
However, we had many cases who could not gain the expected effect of the exercise and / or grew worse with these exercises. In this report, we investigated the most adequate exercise to improve the cuff function and we also analysed cuff function anatomically and physiologically to develop the simple personal training machine. On the strength of the data, we estimated the clinical result using the trial production.
The results were follows :
1) From the integrated EMG analysis under concentric contraction, the load of each exercises should be set up individually.
2) We considered that to correct the imbalance should be the fundamental treatment of the shoulder disorders. Then. four basic patterns of the exercise to improve the function of rotator cuff were selected. Selection of the exercise and the load was decided according to the assessment of electromyographical examination.
3) The trial production of the simple personal training machine could make the expected result clinically. 85% cases were improved from their symptoms using the "Cuff-Y exercise" increasing the activity of cuff muscles.
DESCENTE SPORTS SCIENCE Vol.14/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE
Especially, the mobility of the humeral head on the glenoid is controlled by the surrounding muscles of the joint. The adjustable system are divided into two groups which are outer muscles and inner muscles. Outer muscles work as a performance muscle concerning with speed and power and inner muscles make fulcrum of the motion. The balance of these two groups is the most important in the voluntary movement of the shoulder.
If the cuff dysfunction occurred, relatively increased power of outer muscles make the humeral head slip away from the glenoid. This recurrent abnormal movement should build up the wasting joint spreading the anatomical damage. Many authors reported the importance of the rehabilitation aiming to gain the function of rotator cuff and there were some papers describing the concrete examination program of the rotator cuff.
However, we had many cases who could not gain the expected effect of the exercise and / or grew worse with these exercises. In this report, we investigated the most adequate exercise to improve the cuff function and we also analysed cuff function anatomically and physiologically to develop the simple personal training machine. On the strength of the data, we estimated the clinical result using the trial production.
The results were follows :
1) From the integrated EMG analysis under concentric contraction, the load of each exercises should be set up individually.
2) We considered that to correct the imbalance should be the fundamental treatment of the shoulder disorders. Then. four basic patterns of the exercise to improve the function of rotator cuff were selected. Selection of the exercise and the load was decided according to the assessment of electromyographical examination.
3) The trial production of the simple personal training machine could make the expected result clinically. 85% cases were improved from their symptoms using the "Cuff-Y exercise" increasing the activity of cuff muscles.
DESCENTE SPORTS SCIENCE Vol.14/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE
| Researcher | Hiroaki Tsutsui*1, Mitsukuni Yamaguchi*2 |
|---|---|
| University or institution | *1 Department of Orthopadic Surgery, Showa University. Fujigaoka Rehabilitation Hospital, *2 Department of Physiotherapy, Showa University Fujigaoka Rehabilitation Hospital |
Keywords
shoulder joint, outer muscles, inner muscles, cuff dysfunction, rotator cuff, cuff muscles