Research On The Design Of Unstable Standing Inclined Board Trainer Based On Semg

With the improvement of the health awareness of Chinese residents,the number of people taking exercise is rising year by year,and the common sports injury problems during exercise have also been paid more and more attention.As the joint closest to the ground,the ankle joint accounts for up to 85% of joint and ligament-related sports injuries.But the exercise and rehabilitation training for the ankle joint is often ignored,easy to cause repeated sprain,resulting in ankle instability.Studies have found that ankle dorsiflexion training on a stable standing inclined board and ankle proprioception exercises on a horizontally unstable surface are effective ways to exercise the ankle joint.However,there are few studies that incorporates angle variable factors into unstable training,that is,applying unstable training methods to the inclined board standing training.Therefore,this article will discuss whether the stability of the standing surface activates related muscles during ankle dorsiflexion training.The research results can provide a theoretical basis for the design of the standing inclined board trainer and the optimization of ankle dorsiflexion training,and have important practical significance for the enrichment of ankle training methods and the prevention and rehabilitation of ankle joint injuries.A total of 15 healthy adult men and women were recruited for this experiment.All subjects were instructed to perform ankle dorsiflexion training on the stable and unstable training inclined boards.The angles of the two standing training inclined boards in the comparison experiment were consistent.Through the use of surface electromyography technology to compare and explore the differences in the electromyographic activity characteristics of the muscles involved in the stability of the ankle joint when performing ankle dorsiflexion exercises on a stable and unstable standing training inclined board.The electromyographic signals of the tibialis anterior（TA）,peroneus longus（PL）,medial gastrocnemius muscle（MG）and lateral gastrocnemius muscle（LG）on the dominant side of the lower limbs were recorded to assess muscle activity.The results of the surface electromyography experiment showed that the muscle activity of TA,PL and LG increased during training on an unstable standing inclined board and there was a significant difference（p<0.05）,and the muscle activity of MG increased but not statistically significant（p>0.05）.In addition,the muscle exertion patterns are not the same.The contribution rate of the ankle dorsiflexor active muscle TA will be reduced under unstable standing inclined board training,while the contribution rate of the antagonist muscles PL and MG will increase.On the whole,the vertical ankle dorsiflexion exercise on the unstable inclined board can more effectively activate the muscles involved in the stability of the ankle joint.The training of the stable standing inclined board mainly affects the front muscles of the calf,rather than stability,while the training of the unstable inclined board is more effective in activating the lateral and posterior calf muscles.Therefore,the use of unstable and stable inclined boards for vertical ankle dorsiflexion training has its own advantages and disadvantages,and the two training methods can be effectively combined according to the user’s exercise needs.Finally,the experimental results were applied to the design of the standing inclined board trainer,combining quantitative questionnaire surveys,user interviews and field visits to explore the needs of target users,convert the needs into a list of product features.On this basis,the shape of the product was analyzed.Combined with CMF and ergonomic dimension design elements,the design and practice of the unstable standing inclined board trainer are finally completed.