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Tokio Takagi Toshiharu Yokozawa Yuki Inaba Yuji Matsuda Hitoshi Shiraki 《Sports biomechanics / International Society of Biomechanics in Sports》2017,16(3):387-398
Since clubface orientation at impact affects ball direction and ball spin, the ability to control clubface orientation is one of the most important skills for golfers. This study presents a new method to describe clubface orientation as a function of the clubshaft motions (i.e., swing plane orientation, clubshaft angle in the swing plane, and clubshaft rolling angle) during a golf swing and investigates the relationships between the clubshaft motions and clubface orientation at impact. The club motion data of driver shots were collected from eight skilled golfers using a three-dimensional motion capture system. The degrees of influence of the clubshaft motions on the clubface orientation were investigated using sensitivity analysis. The sensitivity analysis revealed that the swing plane horizontal angle affected the clubface horizontal angle to an extent of 100%, that the clubshaft angle in the swing plane affected both the clubface vertical and horizontal angles to extents of 74 and 68%, respectively, and that the clubshaft rolling angle affected both the clubface vertical and horizontal angles to extents of -67 and 75%, respectively. Since the method presented here relates clubface orientation to clubshaft motions, it is useful for understanding the clubface control of a golfer. 相似文献
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Based on the phenomenal experience that when I read Japanese I don't hear inner speech, I suggest that the role of phonology may be more limited when reading text in Japanese than in English. Although this possibility has been suggested by others, I argue for somewhat different sources of this reduced role. Specifically, I propose that the greater visual discriminability of kanji words under degraded conditions, and the less important role of word order as a syntactic cue are likely to be the key factors. Relevant literature is reviewed, and directions for future research are suggested. 相似文献
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本文通过分析敦煌遗书中作为语言方面的材料,如古逸文献,对音资料以及敦煌学中重要的河西语言圈中的语言史材料,梳理了学界由敦煌文献为汉语史研究带来的新见解,指出今后的研究重点及发展路子. 相似文献
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Sven P. Hoekstra Yoshi-Ichiro Kamijo Tokio Kinoshita Ben T. Stephenson Victoria L. Goosey-Tolfrey 《Journal of sports sciences》2019,37(15):1717-1724
This study investigates the relationship between autonomic function and the inflammatory response to a wheelchair half-marathon in people with a spinal cord injury (SCI). Seventeen wheelchair athletes with a cervical SCI (CSCI, N = 7) and without CSCI (NON-CSCI, N = 10) participated in a wheelchair half-marathon. Blood was taken prior, post and 1 h post-race to determine the concentrations of adrenaline, noradrenaline, extracellular heat shock protein 72 (eHsp72) and interleukin-6 (IL-6). A sit-up tilt test was performed to assess autonomic function at rest. CSCI showed a lower supine ratio of the low and high frequency power of the variability in RR intervals (LF/HF RRI, p = 0.038), total and low frequency power of the systolic blood pressure variability (TP SBP, p < 0.001; LF SBP, p = 0.005) compared to NON-CSCI. Following the race, catecholamine concentrations increased only in NON-CSCI (p < 0.036). The increase in IL-6 post-race was larger in NON-CSCI (p = 0.040). Post-race catecholamine levels explained 60% of the variance in the IL-6 response (r = 0.77, p = 0.040), which was further increased when the resting autonomic function indices were added to the regression model (R2 > 81%, p < 0.012). In summary, the dampened acute inflammatory response to a wheelchair half-marathon in CSCI was strongly associated with the autonomic dysfunction present in this group. 相似文献
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