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Vitamin D Status of Elite Athletes in Singapore and Its Associations With muscle function and Bone Health

Journal of Science in Sport and Exercise 2021年第4期3卷 385-393页

作者： Liyan Huang Danny Lum Mohammad Haiyum Kirsty A.Fairbairn Sport Science and Sport Medicine Singapore Sport InstituteSport SingaporeSingaporeSingapore Physical Education and Sports Science National Institute of EducationNanyang Technological UniversitySingaporeSingapore School of Sports Health and LeisureRepublic PolytechnicSingaporeSingapore Performance Nutrition High Performance Sport New ZealandAucklandNew Zealand

Purpose The primary aim of this study is to determine the prevalence of vitamin D deficiency and insufficiency among Asian athletes participating in indoor and outdoor sports in equatorial *** aims are to examine the relationship between vitamin D status and skeletal muscle strength and performance,and bone *** Serum 25(OH)D concentrations were determined in 95 indoor and outdoor athletes across various *** muscle strength and performance were assessed using the isometric mid-thigh pull(IMTP),drop jump test and 30 m sprint *** Mineral Density(BMD)was measured using Dual-energy X-ray Absorptiometry(DXA).Results Mean serum 25(OH)D concentrations were 28.6±8.9 ng/mL among indoor,and 39.2±13.2 ng/mL among outdoor sport athletes respectively(Pmuscle function were not significantly different between *** and outdoor sport athletes did not have significantly different BMDs although none of the athletes studied presented with poor *** who were deficient in vitamin D had significantly lower BMD compared to athletes with sufficient vitamin D(P=0.01).Conclusion Forty-seven percent of Singaporean athletes studied had suboptimal vitamin D *** monitoring of vitamin D levels among indoor sport athletes should be in place to ensure optimal health and performance.

关键词： Vitamin D Athletes Sports Asia muscle function

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Sustained delivery of vascular endothelial growth factor mediated by bioactive methacrylic anhydride hydrogel accelerates peripheral nerve regeneration after crush injury

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Neural Regeneration Research 2022年第9期17卷 2064-2071页

作者： Wanlin Xu Yifan Wu Hao Lu Yun Zhu Jinhai Ye Wenjun Yang Department of Oral and Maxillofacial-Head and Neck Oncology Shanghai Ninth People’s HospitalShanghai Jiao Tong University School of MedicineCollege of StomatologyShanghai Jiao Tong UniversityNational Center for StomatologyNational Clinical Research Center for Oral DiseasesShanghai Key Laboratory of StomatologyShanghaiChina Jiangsu Key Laboratory of Oral Diseases Department of Oral and Maxillofacial SurgeryThe Affiliated Stomatological Hospital of Nanjing Medical UniversityNanjingJiangsu ProvinceChina

Neurotrophic factors,currently administered orally or by intravenous drip or intramuscular injection,are the main method for the treatment of peripheral nerve crush ***,the low effective drug concentration arriving at the injury site results in unsatisfactory ***,there is an urgent need for a treatment method that can increase the effective drug concentration in the injured *** this study,we first fabricated a gelatin modified by methacrylic anhydride hydrogel and loaded it with vascular endothelial growth factor that allowed the controlled release of the neurotrophic *** modified gelatin exhibited good physical and chemical properties,biocompatibility and supported the adhesion and proliferation of RSC96 cells and human umbilical vein endothelial *** injected into the epineurium of crushed nerves,the composite hydrogel in the rat sciatic nerve crush injury model promoted nerve regeneration,functional recovery and *** results showed that the modified gelatin gave sustained delivery of vascular endothelial growth factors and accelerated the repair of crushed peripheral nerves.

关键词： bioactive material controlled release crush injury hydrogel muscle function nerve regeneration peripheral nerve sciatic function index vascular endothelial growth factor vascularization

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function of shoulder muscles of driver in vehicle steering maneuver

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Science China(Technological Sciences) 2012年第12期55卷 3445-3454页

作者： LIU YaHui JI XueWu RYOUHEI Hayama TAKAHIRO Mizuno LOU LiMing State Key Laboratory of Automotive Safety and Energy Tsinghua UniversityBeijing 100084China Research and Development Center JTEKT Co.Ltd.Nara 634-8555Japan

In order to study the function of muscles of driver shoulder during vehicle steering, identification of relations between electromyograph (EMG) activity of 10 shoulder muscles and steering force was performed. The procedure was to perform controlled steering maneuver by right hand in a driving simulator, and based on analyzing the EMG data with steering force in the steering wheel plane, the function was identified. It was found that muscle function depends strongly on both steering rotation and steering torque directions. In clockwise steering, the long head of triceps brachii was the prime mover and an important contributor to clockwise moment, while the sternocostal portion of the pectoralis major, the lateral head of triceps brachii, biceps brachii and teres major were the important stabilizers or fixators. In contrast, in counterclockwise steering, the anterior, middle and posterior deltoid, the clavicular portion of the pectoralis major and infraspinatus were the prime movers and also the important contributors to counterclockwise moment, while the sternocostal portion of the pectoralis major, the lateral head of triceps brachii, biceps brachii and teres major were the important stabilizers or fixators. We conclude that the prime movers are primarily a consequence of steering direction, while the stabilizers or fixators are primarily constant. These results can be used to improve the neuromuscular model and estimate the steering comfort of driver.

关键词： electromyograph muscle function steering maneuver

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The status of the cervical spine in preschool children with a history of congenital muscular torticollis

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Open Journal of Therapy and Rehabilitation 2013年第2期1卷 31-35页

作者： Anna M.Ohman Department of Paediatrics University of GothenburgQueen Silvia Children’s HospitalGothenburgSweden

Background: Infants with congenital muscular torticollis are born with an asymmetric range of motion and a muscular imbalance in the cervical spine, as a result of a shortening or excessive contraction of the sternocleidomastoid muscle. Purpose: The study aimed to investigate passive range of motion (PROM) for rotation and lateral flexion, and muscle function of the cervical spine in children that had a history of CMT as infants. Study design: a prospective cohort study. Patient sample: 58 children at the age of 3.5 to 5 years that had been treated for CMT have infants participated in the study. Method: PROM was measured with protractors and muscle function was estimated with a modified muscle function Scale. Data from infancy were taken from earlier records. Result: PROM in rotation of the neck was mean 98.7° and PROM in lateral flexion of the neck was mean 69.1°. Symmetric PROM of the neck was found in 74% of the children for rotation and in 88% of the children for lateral flexion. Multiple regression showed that gender and PROM in rotation as infants had a significant impact on asymmetric PROM. Forty-five percent of the children had some degree of muscular imbalance in the lateral flexors of the neck. Conclusion: Possible risk factors for later asymmetric PROM are: gender, birth weight, gestation week and PROM in rotation as infants. These factors ought to be taken into consideration when developing guidelines for long-term follow-up.

关键词： Congenital Muscular Torticollis Cervical Spine Passive Range of Motion Rotation muscle function Children

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