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Human movement science 38건

  1. [해외논문]   Exploring the effects of mental and muscular fatigue in soccer players' performance   SCI SCIE SSCI SCOPUS

    Coutinho, Diogo (Research Center in Sports Sciences, Health Sciences and Human Development (CIDESD), CreativeLab Research Community, University of Trás-os-Montes and Alto Douro, Vila Real, Portugal ) , Gonç (Research Center in Sports Sciences, Health Sciences and Human Development (CIDESD), CreativeLab Research Community, University of Trás-os-Montes and Alto Douro, Vila Real, Portugal ) , alves, Bruno (Sport Science Research Center, Shandong Sport University, Jinan, China ) , Wong, Del P. (Research Center in Sports Sciences, Health Sciences and Human Development (CIDESD), CreativeLab Research Community, Department of Sports Sciences, University of Beira Interior, Portugal ) , Travassos, Bruno (Human Performance Research Centre, University of Technology Sydney (UTS), Sydney, Australia ) , Coutts, Aaron J. (Research Center in Sports Sciences, Health Sciences and Human Development (CIDESD), CreativeLab Research Community, University of Trás-os-Montes and Alto Douro, Vila Real, Portugal) , Sampaio, Jaime
    Human movement science v.58 ,pp. 287 - 296 , 2018 , 0167-9457 ,

    초록

    Abstract This study examined the effects of induced mental and muscular fatigue on soccer players’ physical activity profile and collective behavior during small-sided games (SSG). Ten youth soccer players performed a 5vs5 SSG under three conditions: a) control, playing without any previous activity; b) muscular fatigue, playing after performing a repeated change-of-direction task; c) mental fatigue, playing after completing a 30 min Stroop color-word task. Players’ positional data was used to compute time-motion and tactical-related variables. The muscular fatigue condition resulted in lower distances covered in high speeds (∼27%, 0.3; ±0.5) than the control condition. From the tactical perspective, the muscular fatigue condition resulted in lower distance between dyads and players spent ∼7% more time synchronized in longitudinal displacements than the control condition (0.3; ±0.3). Additionally, players spent ∼14% more time synchronized with muscular fatigue than with mental fatigue (0.7; ±0.3). The mental fatigue condition resulted in a very likely more predictable pattern in the distance between dyads than in muscular fatigue condition (0.4; ±0.2). Also, the mental fatigue possibly decreased the teams’ stretch index when compared with control (0.2; ±0.3) and likely increased compared with muscular fatigue (0.5; ±0.5). The better levels of longitudinal synchronization after muscular fatigue, might suggest the usage of tactical-related tasks after intense exercise bouts. The lower physical performance and time spent longitudinally synchronized after mental fatigue, should alert to consider this variable before matches or training activities that aim to improve collective behavior. Highlights Muscular and mental fatigue promoted changes on players’ physical and tactical performances. Muscular fatigue decreased team dispersion and increase the time spent synchronized in the longitudinal direction. Minimal changes in physical performance were found following muscular fatigue. Mental fatigue decreased team dispersion and movement synchronization in longitudinal direction. Mental fatigue decreased total distance covered and distance covered at high and moderate speed.

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  2. [해외논문]   Receptive language is associated with visual perception in typically developing children and sensorimotor skills in autism spectrum conditions   SCI SCIE SSCI SCOPUS

    Hannant, Penelope (Address: Centre for Innovative Research Across the Life Course, Coventry University, UK.)
    Human movement science v.58 ,pp. 297 - 306 , 2018 , 0167-9457 ,

    초록

    Abstract A number of studies have evidenced marked difficulties in language in autism spectrum conditions (ASC). Studies have also shown that language and word knowledge are associated with the same area of brain that is also responsible for visual perception in typically developing (TD) individuals. However, in ASC, research suggests word meaning is mapped differently, on to situational sensorimotor components within the brain. Furthermore, motor coordination is associated with communication skills. The current study explores whether motor coordination and visual perception are impaired in children with ASC, and whether difficulties in coordination and visual perception correlate with receptive language levels. 36 children took part: 18 with ASC and 18 TD children, matched on age and non-verbal reasoning. Both groups completed the Movement ABC, Beery - Buktenica Developmental Test of Visual - Motor Integration, British Picture Vocabulary Scale and Matrices (WASI). Results showed that ASC children scored significantly lower on receptive language, coordination and visual motor integration than the TD group. In the TD group receptive language significantly correlated with visual perception; in the ASC group receptive language significantly correlated with balance. These results imply that sensorimotor skills are associated with the understanding of language in ASC and thus the relationship between sensorimotor experiences and language warrants further investigation.

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  3. [해외논문]   Motor units in vastus lateralis and in different vastus medialis regions show different firing properties during low-level, isometric knee extension contraction   SCI SCIE SSCI SCOPUS

    de Souza, Leonardo Mendes Leal (Escola de Educação Física e Desportos, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil ) , Cabral, Hé (Programa de Engenharia Biomédica (COPPE), Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil ) , lio Veiga (Escola de Educação Física e Desportos, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil ) , de Oliveira, Liliam Fernandes (Laboratorio di Ingegneria del Sistema Neuromuscolare (LISiN), Dipartimento di Elettronica e Telecomunicazioni, Politecnico di Torino, Torino, TO, Italy) , Vieira, Taian Martins
    Human movement science v.58 ,pp. 307 - 314 , 2018 , 0167-9457 ,

    초록

    Abstract Architectural differences along vastus medialis (VM) and between VM and vastus lateralis (VL) are considered functionally important for the patellar tracking, knee joint stability and knee joint extension. Whether these functional differences are associated with a differential activity of motor units between VM and VL is however unknown. In the present study, we, therefore, investigate neuroanatomical differences in the activity of motor units detected proximo-distally from VM and from the VL muscle. Nine healthy volunteers performed low-level isometric knee extension contractions (20% of their maximum voluntary contraction) following a trapezoidal trajectory. Surface electromyograms (EMGs) were recorded from VM proximal and distal regions and from VL using three linear adhesive arrays of eight electrodes. The firing rate and recruitment threshold of motor units decomposed from EMGs were then compared among muscle regions. Results show that VL motor units reached lower mean firing rates in comparison with VM motor units, regardless of their position within VM ( P P = .997). Furthermore, no significant differences in the recruitment threshold were observed for all motor units analysed ( P = .108). Our findings possibly suggest the greater potential of VL to generate force, due to its fibres arrangement, may account for the lower discharge rate observed for VL then either proximally or distally detected motor units in VM. Additionally, the present study opens new perspectives on the importance of considering muscle architecture in investigations of the neural aspects of motor behaviour.

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  4. [해외논문]   Changes in gait and posture as factors of dynamic stability during walking in pregnancy   SCI SCIE SSCI SCOPUS

    Krkeljas, Zarko (Corresponding author at: Department of Sport Science, Stellenbosch University, Stellenbosch 7600, South Africa.)
    Human movement science v.58 ,pp. 315 - 320 , 2018 , 0167-9457 ,

    초록

    Abstract Changes in gait and postural control during pregnancy may lead to increased fall rates during walking relative to non-pregnant women. Due to lack of empirical evidence on balance and postural control in dynamic conditions, the primary aim of this study was investigate the changes in gait and postural control as factors of stability during walking. Gait and posture of thirty-five (35) pregnant women (27 ± 6.1 years) were analysed at self-selected walking speed, and at different stage of pregnancy. The results indicate that although the gait kinematics did not differ between the trimesters, significant associations were noted between the step width, the lateral trunk lean, and the medio-lateral deviations in centre of gravity and centre of pressure. In contrast to the static conditions, anterior-posterior postural sway is not present during walking, whereas the lateral trunk lean is the primary factor women use in pregnancy to keep the centre of gravity closer to the base of support. Postural changes and those in gait kinematics were largely affected by the relative mass gain, rather than the absolute mass. Considering the importance of relative mass gain, more attention during healthy pregnancy should be given to monitoring the timing of onset of musculoskeletal changes, and design of antenatal exercise programs targeting core strength and pelvic stability. Highlights Postural dynamics may contribute to dynamic stability during walking in pregnancy. Medio-lateral trunk sway during single leg stance helps to maintain stability. Relative mass gain rather than the absolute mass affects change in gait and posture.

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  5. [해외논문]   The changes in classical and nonlinear parameters after a maximal bout to elicit fatigue in competitive swimming   SCI SCIE SSCI SCOPUS

    Barbosa, Tiago M. (Nanyang Technological University, Singapore ) , Chen, Simin (Nanyang Technological University, Singapore ) , Morais, Jorge E. (Polytechnic Institute of Bragança, Bragança, Portugal ) , Costa, Má (Polytechnic Institute of Guarda, Guarda, Portugal ) , rio J. (Department of Sport and Health, School of Science and Technology, University of Évora, Portugal) , Batalha, Nuno
    Human movement science v.58 ,pp. 321 - 329 , 2018 , 0167-9457 ,

    초록

    Abstract The aim was to assess the effect of fatigue on linear and nonlinear parameters in swimming. Twenty-four fitness-oriented swimmers performed a maximal bout of 100 m at front-crawl to elicit fatigue. Before (pre-) and immediately after (post-test) the bout, participants swam an all-out 25 m to derive the speed fluctuation (dv), approximate entropy (ApEn) and fractal dimension (FD) from the speed-time series collected by a speedo-meter. Swim speed was 10.85% slower in the post-test than in the pre-test (p 2 = 0.72). There was an effect of the fatigue on the dv with a moderate effect size. The dv increased shifting the 95CI band from 0.116–0.134 to 0.140–0.161. The ApEn showed non-significant variations between the pre- and post-test having the 95CI of pre- and post-test overlapped (pre: 0.659–0.700; post: 0.641–0.682). The FD showed as well a significant variation (the 95CI moved from 1.954–1.965 to 1.933–1.951). It can be concluded that in swimming there are changes in classical and nonlinear parameters under fatigue. Highlights The speed fluctuation increased significantly under fatigue. There was a significant decrease in the fractal dimension and the entropy showed non-significant variations. In swimming there are changes in the classical and nonlinear parameters under fatigue.

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  6. [해외논문]   Coherence analysis of trunk and leg acceleration reveals altered postural sway strategy during standing in persons with multiple sclerosis   SCI SCIE SSCI SCOPUS

    Huisinga, Jessie (University of Kansas Medical Center, Landon Center on Aging, 3901 Rainbow Blvd, Mail stop 1005, Kansas City, KS 66160, United States ) , Mancini, Martina (Oregon Health & Science University, Department of Neurology, 3181 SW Sam Jackson Park Rd, L226, Portland, OR 97239, United States ) , Veys, Chris (Oregon Health & Science University, Department of Neurology, 3181 SW Sam Jackson Park Rd, L226, Portland, OR 97239, United States ) , Spain, Rebecca (Oregon Health & Science University, Department of Neurology, 3181 SW Sam Jackson Park Rd, L226, Portland, OR 97239, United States ) , Horak, Fay (Oregon Health & Science University, Department of Neurology, 3181 SW Sam Jackson Park Rd, L226, Portland, OR 97239, United States)
    Human movement science v.58 ,pp. 330 - 336 , 2018 , 0167-9457 ,

    초록

    Abstract Balance task performance is affected in persons with multiple sclerosis (PwMS), but the control strategies used to perform specific tasks are not well understood. The purpose of this study was to evaluate segmental control during quiet standing in PwMS and controls to understand whether MS alters use of the ankle and hip strategies to manage postural sway. Coherence of acceleration between the trunk and legs was evaluated with accelerometers placed on the sacrum and lower leg. Thirty-six PwMS and 20 healthy control subjects performed quiet standing with eyes open and closed while center of pressure (CoP) and acceleration of postural sway was measured. Acceleration frequencies were divided into lower frequencies (≤1.0 Hz) and higher frequencies (>1.0 Hz) to categorize sway characteristics. With eyes open, coherence was significantly lower in PwMS compared to controls at lower frequencies only. With eyes closed, coherence was significantly lower in PwMS compared to controls, who use an ankle strategy at lower frequencies only, at both lower and higher frequencies. Both groups showed decreased coherence with increasing frequency when eyes were open and closed. Coherence was significantly correlated with CoP sway area in PwMS during the eyes closed condition only. The reduced coherence in PwMS during both lower and higher frequency sway indicates PwMS utilize a mixed ankle-hip sway strategy regardless of sway frequency. This is in contrast to sway in healthy subjects which utilizes an ankle strategy at lower frequencies and a mixed strategy at higher frequencies. Lack of adaptability in segmental control strategy likely contributes to abnormal postural control, as reflected by CoP sway patterns, in PwMS. Highlights Postural sway is abnormal in persons with multiple sclerosis (PwMS). Abnormal trunk & leg coordination during standing, i.e. coherence, is related to postural sway. Coherence of segment acceleration could be a clinical indicator of postural control changes. Coherence in PwMS could be abnormal due to sensorimotor delays.

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  7. [해외논문]   Dynamic elastic response prostheses alter approach angles and ground reaction forces but not leg stiffness during a start-stop task   SCI SCIE SSCI SCOPUS

    Haber, Cassandra Kay (University of Roehampton, Department of Life Sciences, Whitelands College, SW15 4JD London, UK ) , Ritchie, Laura J. (University of Roehampton, Department of Life Sciences, Whitelands College, SW15 4JD London, UK ) , Strike, Siobhan C. (University of Roehampton, Department of Life Sciences, Whitelands College, SW15 4JD London, UK)
    Human movement science v.58 ,pp. 337 - 346 , 2018 , 0167-9457 ,

    초록

    Abstract In a dynamic elastic response prosthesis (DERP), spring-like properties aim to replace the loss of musculature and soft tissues and optimise dynamic movement biomechanics, yet higher intact limb (IL) loading exists. It is unknown how amputees wearing a DERP will perform in start-stop movements and how altering the prosthetic stiffness will influence the performance and loading. This study assessed movement dynamics through comparisons in spatiotemporal, kinematic and kinetic variables and leg stiffness of intact, prosthetic and control limbs. The effect of prosthetic stiffness on movement dynamics was also determined. Eleven male unilateral transtibial amputees performed a start-stop task with one DERP set at two different stiffness – Prescribed and Stiffer. Eleven control participants performed the movement with the dominant limb. Kinematic and kinetic data were collected by a twelve-camera motion capture system synchronised with a Kistler force platform. Selected variables were compared between intact, prosthetic and control limbs, and against prosthetic stiffness using ANOVA and effect size. Pearson’s Correlation was used to analyse relationship between leg stiffness and prosthetic deflection. Amputees showed a more horizontal approach to the bound during the start-stop movement, with lower horizontal velocities and a longer stance time on the IL compared to controls. In both stiffness conditions, the IL showed selected higher anteroposterior and vertical forces and impulses when compared to the controls. Leg stiffness was not significantly different between limbs as a result of the interplay between angle swept and magnitude of force, even with the change in prosthetic stiffness. A main effect for prosthetic stiffness was found only in higher impact forces of the prosthetic limb and more horizontal touchdown angles of the IL when using the prescribed DERP. In conclusion, amputees achieve the movement with a horizontal approach when compared to controls which may reflect difficulty of movement initiation with a DERP and a difficulty in performing the movement dynamically. The forces and impulses of the IL were high compared to control limbs. The consistent leg stiffness implies compensation strategies through other joints. Highlights Transtibial amputees could perform a dynamic start-stop movement with differences to controls. A more horizontal movement in amputees reflects difficulty in movement initiation. Higher forces suggest increased chronic injury risk of the intact limb. The consistent lower body stiffness implies compensation through other joints.

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  8. [해외논문]   Better together: Contrasting the hypotheses explaining the one-target advantage   SCI SCIE SSCI SCOPUS

    Bested, Stephen R. (Corresponding author at: University of Toronto, Toronto, ON M5S 2W6, Canada.) , de Grosbois, John , Tremblay, Luc
    Human movement science v.58 ,pp. 347 - 356 , 2018 , 0167-9457 ,

    초록

    Abstract Movement times are significantly shorter when moving from a start position to a single target, compared to when one has to continue onto a second target (i.e., the one-target advantage [OTA]). To explain this movement time difference, both the movement integration and the movement constraint hypotheses have been proposed. Although both hypotheses have been found to have explanatory power as to why the OTA exists, the support for each has been somewhat equivocal. The current review evaluated the relative support in the literature for these two hypotheses. Ultimately, preferential support for each theoretical explanation was found to be related to the higher indices of difficulty (IDs: Fitts, 1954) employed. That is, studies that included higher IDs (i.e., 6–8 bits) were more likely to provide more support for the movement constraint hypothesis, whereas studies employing lower IDs (i.e., 1–4 bits) were more likely to provide more support for the movement integration hypothesis. When the IDs employed were relatively intermediate (i.e., 5 bits), both hypotheses were mostly supported. Thus, task difficulty is crucial when determining which hypothesis better explains the planning and control of sequential goal-directed movements. Critically, the OTA most likely always involves integration but may also involve constraining if the accuracy demands are sufficiently high.

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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