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Effects of contact/collision sport history on gait in early-to mid-adulthood

Journal of Sport and Health Science 2023年第3期12卷 398-405页

作者： Katherine J.Hunzinger Jaclyn B.Caccese Rebekah Mannix William P.MeehanⅢ jocelyn f.hafer C.Buz Swanik Thomas A.Buckley Department of Biostatistics Epidemiologyand InformaticsUniversity of Pennsylvania Perelman School of MedicinePhiladelphiaPA 19104USA Penn Injury Science Center University of PennsylvaniaPhiladelphiaPA 19104USA School of Health and Rehabilitation Sciences The Ohio State University College of MedicineColumbusOH 43210USA Division of Emergency Medicine Boston Children's HospitalBostonMA 02115USA Departments of Pediatrics and Emergency Medicine Harvard Medical SchoolBostonMA 02115USA The Micheli Center for Sports Injury Prevention WalthamMA 02453USA Division of Sports Medicine Department of OrthopedicsBoston Children's HospitalBostonMA 02453USA Department of Pediatrics and Orthopedics Harvard Medical SchoolBostonMA 02453USA Department of Kinesiology and Applied Physiology University of DelawareNewarkDE 02453USA Interdisciplinary Program in Biomechanics and Movement Science University of DelawareNewarkDE 02453USA

Background:To determine the effect of contact/collision sport participation on measures of single-task(ST)and dual-task(DT)gait among early-to middle-aged ***:The study recruited 113 adults(34.88±11.80 years,(mean±SD);53.0%female)representing 4 *** included(a)former non-contact/collision athletes and non-athletes who are not physically active(n=28);(b)former non-contact/collision athletes who are physically active(n=29);(c)former contact/collision sport athletes who participated in high-risk sports and are physically active(n=29);and(d)former rugby players with prolonged repetitive head impact exposure history who are physically active(n=27).Gait parameters were collected using inertial measurement units during ST and DT *** cost was calculated for all gait parameters(double support,gait speed,and stride length).Groups were compared first using one-way analysis of *** a multiple regression was performed for participants in the highrisk sport athletes and repetitive head impact exposure athletes groups only to predict gait outcomes from contact/collision sport career ***:There were no significant differences between groups on any ST,DT,or DT cost outcomes(p>0.05).Contact/collision sport duration did not predict any ST,DT,or DT cost gait ***:Years and history of contact/collision sport participation does not appear to negatively affect or predict neurobehavioral function in early-to mid-adulthood among physically active individuals.

关键词： Exercise Neurodegenerative disease Postural control Rugby Subconcussive impacts

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从白符虫兆(弹尾纲)活性卵的形状变化探讨沃尔巴克氏体的共生作用(英文)

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Zoological Research 2010年第6期31卷 623-626页

作者： Nina hafer Nathan Pike Department of Zoology University of Oxford Tinbergen Building South Parks Road Oxford OX1 3PS UK

Wolbachia属共生菌的侵染是引起跳虫——白符虫兆孤雌生殖的原因。对带有正常沃尔巴克氏体菌群的白符虫兆卵和通过利福平处理剔除沃尔巴克氏体菌群的白符虫兆卵的胚胎发育进行实验观察。白符虫兆的活性卵产出3到4天后,卵体大小显著性地... 详细信息

Wolbachia属共生菌的侵染是引起跳虫——白符虫兆孤雌生殖的原因。对带有正常沃尔巴克氏体菌群的白符虫兆卵和通过利福平处理剔除沃尔巴克氏体菌群的白符虫兆卵的胚胎发育进行实验观察。白符虫兆的活性卵产出3到4天后,卵体大小显著性地增大,并伴随卵体形状从球形到圆饼形的变化。这些变化在利福平处理的或者是7%自然失活的非活性卵中都没有出现。推测沃尔巴克氏体在白符虫兆卵产出后的3天之内或者3天之前的受精卵发育或胚胎发育中发挥着重要作用;同时根据目前已有的研究结果推断沃尔巴克氏体对白符虫兆卵发育可能的影响机制。

关键词：孤雌生殖胚胎发育弹尾纲孵化率

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脑卒中后肌肉分子表型与步率的相关性研究

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世界核心医学期刊文摘（神经病学分册） 2005年第1期1卷 26-27页

作者： De Deyne P.G. hafer-Macko C.E Ivey f.M. et al. 刘亦恒 DePuy Biologics 325 Paramount Drive Raynham MA 02767 United States Dr

The disability of patients after stroke is generally attributed to upper motor neuron defects, but secondary changes in paretic muscle may enhance the disability. We analyzed the molecular phenotype and metabolic profile of the paretic and nonparetic vastus lateralis (VL) andwemeasured the severity of gait deficit in 13 patients at least 6 months after ischemic stroke. The results showed a significant increase in the proportion of fast myosin heavy chain (MHC, 68 ± 14% ) in the paretic compared to the nonparetic VL (50 ± 13% ). The specific activity of citrate synthase and glyceraldehyde phosphodehydrogenase was not significantly different between the two sides. The proportion of fast MHC was inversely associated with severity of gait deficit indexed by self selectedwalking speed in the paretic leg, but not the nonparetic leg. Our findings demonstrate significant and potentially modifiable secondary biologic changes in hemiparetic muscle phenotype thatmay contribute to the disability of stroke.

关键词：上运动神经元甘油磷酸功能障碍生物学变化行走障碍代谢状况行走速度轻瘫肌球蛋白重链脱氢酶活性

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