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Tendon injuries - part 4

ngón tay, như là trường hợp khi nắm một công cụ lớn, counterforces có thể cao hơn 2-3 lần so với khi một lực lượng so sánh được áp dụng cho phân đoạn ngón tay gần [39]. Ngược lại, nếu một đối tượng là rất nhỏ | 98 L.M. Rozmaryn fingers as is the case when grasping a large tool the counterforces can be 2 to 3 times higher than when a comparable force is applied to more proximal finger segments 39 . Conversely if an object is very small the fingers cannot effectively apply force to it partially because finger flexor tendons become extremely shortened. This is especially true when attempting to forcibly grasp a small object or tool handle with a flexed wrist as this action further shortens the finger flexor muscles. Maximum grip strength is achieved when the handle begins to close for about 8 cm. In general women demonstrate approximately half the grip strength of men. When grip strength exceeds 40 Newtons and is repeated often the odds of developing carpal tunnel syndrome are 15 times higher than if workers exerted less than 10 Newtons infrequently 40 . Thus force and magnitude grip frequency play a role in the development of RSI. Employee Exercise Programs RSIs occur more frequently in people who do not follow a regular exercise program. Looking at the computer workplace mini exercise breaks throughout the workday not only diminish the incidence of RSI but actually increase worker productivity and prevent productivity drop-off that frequently occurs at the end of the day 41 . There are many published mini break exercise programs that allow workers to stretch the neck shoulders forearms hand and wrists at the workstation. There are also maxi break exercises that workers can do twice daily 41 . Other options include job rotation introduction of other tasks into the work cycle and limitation of work hours. Many companies have included in-house fitness facilities where stretching relaxation and strengthening exercises are taught. Pictorial handouts and poster displays throughout the workplace may also be useful. Many software companies have developed exercise programs that flash reminders on the screen that instruct the worker to stop work and start exercise. Efficacy of .