| Summary: | 碩士 === 國立臺北教育大學 === 體育學系碩士班 === 97 === The purpose of this study was to compare and analysis the changes of walking on the slippery floor with three different high heels ( 3cm, 5.5cm, 8 cm) in kinematical, dynamics and lower limbs electromyographic (EMG) parameters. The experiment subjects are 10 healthy female adults with high heeled experience (age:21.8±4.69 years old, height:158.0±3.91cm,weight:52.4±4.36kg) .
A Mega speed 25k high-speed camera (100Hz) , an AMTI force plate (1000Hz) and a Biovision EMG system(2500Hz) are used to simultaneously capture kinematical, dynamics and lower limbs EMG parameters during the subjects walking on the slippery floor with high heeled in one gait cycle. Kinematical parameters are filmed through the camera, then the obtain film undergoes human limb sections of parameter organization system, Direct Linear Transformation and filter by the Kwon3D movement analysis software, in order to obtain the parameters such as gait cycle, trunk forward inclination angle, heel contact velocity, hip, knee, ankle of joint angle. The original signal from the force plate, processed by DASYLab 6.0 software to low-pass filtering (10Hz) and calibrate modular, calculates the original ground reaction forece. Body weight (B.W) is used as the basis for standardization to obtain ground reaction force values and impulse values. The original signal of EMG from Rectus femoris (RF), Biceps femoris long head (BF), Tibialis anterior (TI) and Gastrocnemius lateral head (GAS) is processed by DASYLab 6.0 software to band-pass (10-500Hz), full-wave rectification and low-pass filtering (10Hz), after using the formula root mean square (RMS) to get the root mean RMS value, divided by total gait cycle as the basis for standardization (100%) . The resulting data undergoes one-way ANOVA via SPSS 12.0 statistics software, The level of significance for this experiment is set to α=.05.
The result are :
1. The gait cycle, stand phase of hip, knee, ankle joint average angle, trunk forward inclination angle, heel contact velocity, were significantly different (p<.05).
2. The first peak force (FPF), second peak force (SPF), average loading rate of vertical ground reaction force and braking force peak (BFP) of horizontal ground reaction force were significantly different (p<.05).
3. The average EMG of BF and GAS in the braking phase and the average EMG of RF and TI in the propulsion phase reached the significant difference (p<.05).More muscles were recruited wearing 8cm high-heeled shoes.
According to the results analyzed, we conclude that: It appears that females wearing 8cm high-heeled shoes may increases the vertical ground reaction force, maximal loading rate, vertical movement of the center body mass, trunk forward inclination angle, and need to reduce heel contact velocity, recruited more motor units, it may make muscle fatigue when wearing long time and cause musculoskeletal symptoms . Therefore, women should be aware of the high-heeled problems when choosing shoes.
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