TSMA Yearbook 2018

129 Taiwan Sporting Goods Manufacturers Association strength declines faster than the maximum isometric contraction strength. Therefore, for the old people. There shall be more resistance trainings to enhance the explosive strength. Traditional weight-stack resistance apparatus gives universalization and convenience. Previous documents indicate that once old people take high-intensity or long-time traditional weight- stack resistance training, it is effective to improve the explosive strength of their legs. Also, other studies show that low-intensity and high-speed movement can improve the lower-limbs muscle strength and explosive strength more effectively. Regarding to the function performances, some documents suggest that low-intensity training is better than medium-or-high-intensity training. In the past, the literature also presents that the function performance of the elderly people is not good. It might be related to the coordination between concentric muscle action and eccentric muscle action. Inertia resistance training due to the unique characteristics is to overcome the still inertia so as to complete concentration movement before actions. In eccentric period of time, it is necessary to overcome the previous rolling power with greater muscle strength so to succeed in the eccentric contraction training and improve the function performance in daily life. Hydraulic resistance training equipment features concentric and concentric contraction. In the progress, action requires the user to do his or her best. Scholars point out that in the process of hydraulic training, the heartbeat of the user might reach 84% of the maximum heartbeat. Besides, oxygen consumption one-minute after exercise is larger than while doing exercise. Thus, also some literature advises that hydraulic resistance training apparatus could be used for the recovered athletes. They may improve not only their oxygen consumption but also upper- limbs strength. Elastic band is a commonly-seen tool for strength training. The advantages are low cost, user-friendly and easy to carry around, large movement and no need to rely on weight resistance training, etc. Also some studies show that the flexibility of lower body, dynamic balance and lower-limbs muscle strength, etc. can be improved by elastic band training. There are distinct differences among various resistance sources. Different training methods create different performance effects. However, even with understanding of all kinds of resistance sources and training effects, it is uncertain which resistance source is appropriate for the elderly to use. In order to make objective comparisons, this study focuses on different levels of intensity and then recognizes which resistance source and resistance apparatus is better for the old people to use. Based on safety reasons, this study is based on