Browsing by Author "Po-Chieh Chen"

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    Differences in 3D kinematics between genders during volleyball spike
    (2011-07-07) 黃長福; Po-Chieh Chen; Chen-Fu Huang; Szu-Ming Shih
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    The influence of tai-chi exercise on dynamics of lower extremity for the elderly during sit-to- stand
    (2014-07-16) 黃長福; Chung-Lin Wu; Chen-Fu Huang; Po-Chieh Chen
    The purpose of this study was to investigate the influence of Tai Chi exercise on sit-tostand in the elderly. Ten healthy female elders (normal group) and nine healthy Tai-Chi female practitioner (Tai-Chi group) participated in this study. The results indicated: (1) During the forward flexion phase, normal group showed significantly greater hip flexion angle and moment than Tai-Chi group (p<.05); (2) During the extension phase, normal group showed significantly greater hip and ankle extension moments than Tai-Chi group (p<.05). Results indicated that the normal group tended to use excessive hip flexion strategy in shorter time to stand, while the Tai-Chi group used smooth strategy instead. Therefore, we suggested that the regular Tai-Chi training could reduce the fatigue and instability of sit to stand for the elderly.
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    Kinetic differences in lower extremity between baseball pitching from pitcher's mound and flat-ground
    (2014-07-16) 黃長福; Po-Chieh Chen; Chen-Fu Huang; Chun-Lung Lin; Bo-Jen Ko
    The purpose of this study was to investigate the kinetic differences in lower extremity between pitching from a mound and flat-ground. A motion capture system and two force plates were used simultaneously to collect the dynamic data of 8 baseball male pitchers. The results revealed that pitching from the mound generated higher propulsive force at the trailing leg as well as greater braking force and vertical ground reaction force at the lead leg (p< .05). The trailing leg in the mound condition generated greater knee posterior joint force while the lead leg had greater axial joint force at ankle and knee, as well as greater extension moment at ankle, knee and hip (p< .05). It was concluded that pitching from the mound generated higher ground reaction force, which resulted in higher joint forces and moments and thus might increase stresses at lower extremity.