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Vibration-Damping technology in tennis racquets:Effects on vibration transfer to the arm,muscle fatigue and tennis performance

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Sports Medicine and Health Science 2019年第1期1卷 49-58页

作者： I-Ling Yeh Naveen Elangovan Rebecca Feczer Sanaz Khosravani Arash Mahnan jürgen konczak Human Sensorimotor Control Laboratory School of KinesiologyUniversity of MinnesotaMinneapolisUSA Department in Occupational Therapy Singapore Institute of TechnologySingapore Program in Rehabilitation Science University of MinnesotaMinneapolisUSA Department of Otolaryngology Harvard University Medical SchoolCambridgeUSA

High vibration transfer from a tennis racquet to the player may cause discomfort,and is hypothesized to influence performance and the onset of muscle *** study examined a racquet with a novel vibration damping technology(VDT)designed to mitigate frame *** vibration,post-impact vibration transfer to the player,arm electromyographic activity and tennis performance were compared to a non-VDT *** young adult,competitive tennis players hit forehands and serves until near exhaustion on two days;using one of the two racquets each ***-axial accelerometers mounted to racquet shaft,hand and forearm recorded vibration *** electromyography recorded activity of five arm *** comparison to the non-VDT racquet,the VDT design showed:1)A significantly lower mean normalised acceleration signal energy at the racquet during unfatigued play(-40%)and at near exhaustion(-34%),which corresponded to a 20–25%lower signal energy at the hand.2)Reduced signs of arm muscle fatigue at near exhaustion,which was most pronounced in biceps and wrist extensors.3)Players hit 11%more forehands and placed 40%more hits in the target area at near ***:VDT effectively reduces racquet *** evidence indicates that it may delay muscle fatigue,which was associated with increased ball placement accuracy.

关键词： Acceleration Biomechanics Electromyography Human Kinematics

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Hatha yoga training improves standing balance but not gait in Parkinson's disease

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Sports Medicine and Health Science 2020年第2期2卷 80-88页

作者： Naveen Elangovan Corjena Cheung Arash Mahnan jean F.Wyman Paul Tuite jürgen konczak Human Sensorimotor Control Laboratory School of KinesiologyUniversity of MinnesotaMinneapolisMNUSA Center for Clinical Movement Science University of MinnesotaMinneapolisMNUSA School of Nursing University of MinnesotaMinneapolisMNUSA Department of Neurology University of Minnesota HealthMinneapolisMNUSA Department of Health Hong Kong Adventist CollegeHong KongChina

Background and purpose:Complementary therapies,such as yoga,have been proposed to address gait and balance problems in Parkinson's disease(PD).However,the effects of yoga on gait and static balance have not been studied systematically in people with PD(PWP).Here we evaluated the effects of a 12-week long Hatha yoga intervention on biomechanical parameters of gait and posture in ***:We employed a pilot randomized controlled trial design with two groups of mild-to-moderate PWP(immediate treatment,waitlist control;N?10 each;Mean Hoehn and Yahr score=2 for each group).Baseline Unified Parkinson's Disease Rating Scale(UPDRS)motor scores,and gait and postural kinematics including postural sway path length,cadence,walking speed,and turning time were *** immediate treatment group received a 60-min Hatha yoga training twice a week for 12 weeks,while the waitlisted control group received no *** 12 weeks,gait and postural kinematics were assessed(post-test for treatment group and second-baseline for waitlist group).Then,the waitlist group received the same yoga training and was evaluated ***:After Hatha yoga training,UPDRS motor scores improved with an 8-point mean decrease which is considered as a moderate clinically important change for mild-moderate *** path length during stance decreased significantly(mean reduction:-34.4%).No significant between-group differences or improvements in gait kinematics were ***:This study showed that a 12-week Hatha yoga training can improve static balance in *** found no evidence that it systematically improves gait performance in PWP.

关键词： Hatha yoga Parkinson's disease Posture Gait

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对“本体感觉评估:方法学综述”的评论（英文）

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journal of Sport and Health Science 2016年第1期5卷 91-92页

作者： Carmen Krewer Ann Van de Winckel Naveen Elangovan joshua E.Aman jürgen konczak Human Sensorimotor Control Laboratory University of Minnesota Minneapolis MN 55455 USA Schon Klinik BadAibling BadAibling 83043 Germany Program in Physical Therapy University of Minnesota Minneapolis MN 55455 USA

In recent years,the assessment of proprioceptive function has received increased attention in clinical and motor skill *** is not surprising given the growing body of scientific evidence on the importance of proprioceptive information for controlling nearly all facets of human movement;from standing to performing highly skilled movement

关键词：本体评估方法评论人体运动功能评估感觉信息科学证据运动模式

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ORLICZ-LORENTZ SEQUENCE SPACES EQUIPPED WITH THE ORLICZ NORM In memory of Henryk Hudzik,a great man,our teacher and colleague

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Acta Mathematica Scientia 2022年第2期42卷 623-652页

作者：崔云安 Pawel FORALEWSKI joanna konczak Department of Mathematics Harbin University of Science and TechnologyHarbin 150080China Faculty of Mathematics and Computer Science Adam Mickiewicz UniversityPoznanUniwersytetu Poznanshiego 461-614 PoznanPoland

In this article,we consider Orlicz-Lorentz sequence spaces equipped with the Orlicz norm(λ_(φ,ω),‖·‖_(φ,ω)^(O))generated by any Orlicz function and any non-increasing weight *** far as we know,research on such a general case is conducted for the first *** showing that the Orlicz norm is equal to the Amemiya norm in general and giving some important properties of this norm,we study the problem of existence of order isomorphically isometric copies of l∞in the space(λ_(φ,ω),‖·‖_(φ,ω)^(O))and we find criteria for order continuity and monotonicity properties of this *** also find criteria for monotonicity properties of n-dimensional subspaces λ_(φ,ω)^(n)(n≥2)and the subspace(λ_(φ,ω))_(a) of order continuous elements of λ_(φ,ω).Finally,as an immediate consequence of the criteria considered in this article,the properties of Orlicz sequence spaces equipped with the Orlicz norm are deduced.

关键词： Orlicz-Lorentz spaces Banach symmetric spaces Orlicz norm order continuity and copies of l^(∞) monotonicity properties

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A Comparison Study of Phenolic Contents and <i>in Vitro</i>Antioxidant Activities of Australian Grown Faba Beans (<i>Vicia faba</i>L.) Varying in Seed Coat Colours as Affected by Extraction Solvents

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American journal of Analytical Chemistry 2019年第6期10卷 227-245页

作者： Siem Doo Siah Samson Agboola jennifer A. Wood Izabela konczak Christopher L. Blanchard Graham Centre for Agricultural Innovation Wagga Wagga Agricultural Institute Wagga Wagga Australia Australian Export Grains Innovation Centre (AEGIC) North Ryde NSW Australia School of Biomedical Sciences Charles Sturt University Wagga Wagga Australia Food Futures Flagship CSIRO Animal Food and Health Sciences North Ryde NSW Australia School of Agricultural and Wine Sciences Charles Sturt University Wagga Wagga Australia Tamworth Agricultural Institute NSW Department of Primary Industries Calala Australia Food Science and Technology School of Chemical Sciences and Engineering University of New South Wales Sydney Australia ARC Industrial Transformation Training Centre for Functional Grains Charles Sturt University Wagga Wagga NSW Australia

Twelve Australian grown faba bean genotypes with seed colour ranging from white, different shades of buff/beige, green, red and purple, were extracted using 80% methanol (v/v) or 70% acetone (v/v). The findings showed that commonly consumed buff-coloured genotypes have comparable phenolic contents and antioxidant activities to those with exotic seed coat colour (red, green and purple). In general, the extraction yield for methanol and acetone extracts of faba bean genotypes were similar. However, the acetone extracts of faba bean varieties with coloured seed coats exhibited higher antioxidant activities than their methanol extracts counterparts. Phenolic compounds and antioxidant activities of the genotypes were compared in an array of chemical-based assays and profiled using an on-line high-performance liquid chromatography-post column derivatization (HPLC-PCD) system. The total phenolic content (TPC) and total flavonoid content (TFC) of acetone extracts were approximately twice those of methanol extracts. The acetone extracts contained six times higher levels of di(phenyl)-(2,4,6-trinitrophenyl) imi- noazanium radical scavenging activity (DPPH), six times higher Total Equivalent Antioxidant Capacity (TEAC) and two times higher Ferric Reducing Antioxidant Power (FRAP) than those of methanol extracts. In general, the methanol extracts of white-coloured faba bean genotype exhibited comparable phenolic contents and antioxidant activities to varieties with coloured seed coats. However, the TPC, TFC, DPPH, TEAC and FRAP of acetone extracts from white-coloured genotype were 2 - 4, 1 - 2, 5 - 9, 2 - 3 and 1 - 2 times lower than those of faba bean varieties with coloured seed coats. HPLC-PCD analyses showed substantial antioxidant responses, represented as a dense “hump” of peaks in the HPLC chromatograms of acetone extracts from coloured-genotypes. This “hump” was not detected in the chromatograms of white-genotype acetone extracts, or in chromatograms of methanol extract

关键词： Vicia faba Extraction Solvent Phenolic Compound Antioxidant

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