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Human Movement Science

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https://www.readbyqxmd.com/read/28641172/the-impact-of-speed-and-time-on-gait-dynamics
#1
Kathleen S Thomas, Daniel M Russell, Bonnie L Van Lunen, Sheri R Colberg, Steven Morrison
To determine the effects of speed on gait previous studies have examined young adults walking at different speeds; however, the small number of strides may have influenced the results. The aim of this study was to investigate the immediate and long-term impact of continuous slow walking on the mean, variability and structure of stride-to-stride measures. Fourteen young adults walked at a constant pace on a treadmill at three speeds (preferred walking speed (PWS), 90% and 80% PWS) for 30 min each. Spatiotemporal gait parameters were computed over six successive 5-min intervals...
June 19, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28628849/kinematic-patterns-underlying-disguised-movements-spatial-and-temporal-dissimilarity-compared-to-genuine-movement-patterns
#2
Fabian Helm, Jörn Munzert, Nikolaus F Troje
This study examined the kinematic characteristics of disguised movements by applying linear discriminant (LDA) and dissimilarity analyses to the motion data from 788 disguised and 792 non-disguised 7-m penalty throws performed by novice and expert handball field players. Results of the LDA showed that discrimination between type of throws (disguised vs. non-disguised) was more error-prone when throws were performed by experts (spatial: 4.6%; temporal: 29.6%) compared to novices (spatial: 1.0%; temporal: 20...
June 16, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28622637/children-benefit-differently-from-night-and-day-time-sleep-in-motor-learning
#3
Jin H Yan
Motor skill acquisition occurs while practicing (on-line) and when asleep or awake (off-line). However, developmental questions still remain about whether children of various ages benefit similarly or differentially from night- and day-time sleeping. The likely circadian effects (time-of-day) and the possible between-test-interference (order effects) associated with children's off-line motor learning are currently unknown. Therefore, this study examines the contributions of over-night sleeping and mid-day napping to procedural skill learning...
June 13, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28605695/bimanual-tapping-of-a-syncopated-rhythm-reveals-hemispheric-preferences-for-relative-movement-frequencies
#4
Anja Pflug, Florian Gompf, Christian Alexander Kell
In bimanual multifrequency tapping, right-handers commonly use the right hand to tap the relatively higher rate and the left hand to tap the relatively lower rate. This could be due to hemispheric specializations for the processing of relative frequencies. An extension of the double-filtering-by-frequency theory to motor control proposes a left hemispheric specialization for the control of relatively high and a right hemispheric specialization for the control of relatively low tapping rates. We investigated timing variability and rhythmic accentuation in right handers tapping mono- and multifrequent bimanual rhythms to test the predictions of the double-filtering-by-frequency theory...
June 9, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28605694/effect-of-increased-kick-frequency-on-propelling-efficiency-and-muscular-co-activation-during-underwater-dolphin-kick
#5
Keisuke Kobayashi Yamakawa, Hirofumi Shimojo, Hideki Takagi, Shozo Tsubakimoto, Yasuo Sengoku
In this study, we investigated the effects of increased kick frequency on the propelling efficiency and the muscular co-activation during underwater dolphin kick. Participants included eight female collegiate swimmers. The participants performed seven 15-m underwater dolphin kick swimming trials at different kick frequencies, which is 85, 90, 95, 100, 105, 110, and 115% of their maximum effort. The Froude (propelling) efficiency of the dolphin kick was calculated from the kinematic analysis. The surface electromyography was measured from six muscles (rectus abdominis, erector spinae, rectus femoris, biceps femoris, tibialis anterior, and gastrocnemius)...
June 9, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28600030/commentary-on-towards-a-grand-unified-theory-of-sports-performance
#6
Dieter Hackfort
No abstract text is available yet for this article.
June 6, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28595134/fatigue-induced-dissociation-between-rate-of-force-development-and-maximal-force-across-repeated-rapid-contractions
#7
Gennaro Boccia, Davide Dardanello, Cantor Tarperi, Luca Festa, Antonio La Torre, Barbara Pellegrini, Federico Schena, Alberto Rainoldi
We examined whether the presence of fatigue induced by prolonged running influenced the time courses of force generating capacities throughout a series of intermittent rapid contractions. Thirteen male amateur runners performed a set of 15 intermittent isometric rapid contractions of the knee extensor muscles, (3s/5s on/off) the day before (PRE) and immediately after (POST) a half marathon. The maximal voluntary contraction force, rate of force development (RFDpeak), and their ratio (relative RFDpeak) were calculated...
June 5, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28577395/investigating-the-social-behavioral-dynamics-and-differentiation-of-skill-in-a-martial-arts-technique
#8
Robert R Caron, Charles A Coey, Ashley N Dhaim, R C Schmidt
Coordinating interpersonal motor activity is crucial in martial arts, where managing spatiotemporal parameters is emphasized to produce effective techniques. Modeling arm movements in an Aikido technique as coupled oscillators, we investigated whether more-skilled participants would adapt to the perturbation of weighted arms in different and predictable ways compared to less-skilled participants. Thirty-four participants ranging from complete novice to veterans of more than twenty years were asked to perform an Aikido exercise with a repeated attack and response, resulting in a period of steady-state coordination, followed by a take down...
May 31, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28575710/upper-limb-movement-analysis-during-gait-in-multiple-sclerosis-patients
#9
Charlotte Elsworth-Edelsten, Alice Bonnefoy-Mazure, Magali Laidet, Stephane Armand, Frederic Assal, Patrice Lalive, Gilles Allali
PURPOSE: Gait disorders in multiple sclerosis (MS) are well studied; however, no previous study has described upper limb movements during gait. However, upper limb movements have an important role during locomotion and can be altered in MS patients due to direct MS lesions or mechanisms of compensation. The aim of this study was to describe the arm movements during gait in a population of MS patients with low disability compared with a healthy control group. METHODS: In this observational study we analyzed the arm movements during gait in 52 outpatients (mean age: 39...
May 30, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28551511/the-effects-of-foot-cooling-on-postural-muscle-responses-to-an-unexpected-loss-of-balance
#10
Oran W Ferguson, Nadia Polskaia, Craig D Tokuno
The purpose of this study was to examine the role of foot sole somatosensory information during reactive postural control. Twenty young adults (22.0±1.4y) participated in this study. Baseline skin sensitivity from the foot sole was assessed using Semmes-Weinstein monofilaments. Postural muscle responses, in the form of electromyographic (EMG) onset latencies and amplitudes, were then obtained while participants recovered their balance while standing on a moveable platform that could translate in either the forward or backward direction...
May 25, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28535435/multi-segmental-thoracic-spine-kinematics-measured-dynamically-in-the-young-and-elderly-during-flexion
#11
Dominika Ignasiak, Andrea Rüeger, Stephen J Ferguson
In contrast to the cervical and lumbar region, the normal kinematics of the thoracic spine have not been thoroughly investigated. The aim of this study was to characterize normal multi-segmental continuous motion of the whole thoracolumbar spine, during a flexion maneuver, in young and elderly subjects. Forty-two healthy volunteers were analyzed: 21 young (age=27.00±3.96) and 21 elderly (age=70.1±3.85). Spinal motion was recorded with a motion-capture system and analyzed using a 3rd order polynomial function to approximate spinal curvature throughout the motion sequence...
May 20, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28527424/influence-of-chronic-stretching-on-muscle-performance-systematic-review
#12
D M Medeiros, C S Lima
The aim of the current study was to investigate the influence of chronic stretching on muscle performance (MP) by a systematic review. The search strategy included MEDLINE, PEDro, Cochrane CENTRAL, LILACS, and manual search from inception to June 2016. Randomized and controlled clinical trials, non-randomized, and single group studies that have analyzed the influence of flexibility training (FT) (using any stretching technique) on MP were included. Differently, studies with special populations (children, elderly, and people with any dysfunction/disease), and articles that have used FT protocols shorter than three weeks or 12 sessions were excluded...
May 17, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28527423/task-related-and-person-related-variables-influence-the-effect-of-low-back-pain-on-anticipatory-postural-adjustments
#13
Jesse V Jacobs, Courtney A Lyman, Juvena R Hitt, Sharon M Henry
BACKGROUND: People with low back pain exhibit altered postural coordination that has been suggested as a target for treatment, but heterogeneous presentation has rendered it difficult to identify appropriate candidates and protocols for such treatments. This study evaluated the associations of task-related and person-related factors with the effect of low back pain on anticipatory postural adjustments. METHODS: Thirteen subjects with and 13 without low back pain performed seated, rapid arm flexion in self-initiated and cued conditions...
May 17, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28527422/index-of-difficulty-and-side-of-space-are-accommodated-during-the-selection-and-planning-of-a-joint-action
#14
Matthew Ray, John de Grosbois, Timothy N Welsh
Co-actors can facilitate the achievement of a shared goal by accurately anticipating each other's needs and subsequently planning actions to accommodate those needs. The purpose of the present study was to determine if co-actors plan and execute their movements to accommodate the difficulty of their partners' action. We hypothesized that information derived from shared task representations could influence the simulation of other's actions and that motor experience would enhance the ability of co-actor's to anticipate their co-actor's needs...
May 17, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28521221/high-intensity-repeated-sprints-impair-postural-control-but-with-no-effects-on-free-throwing-accuracy-in-under-19-basketball-players
#15
Fabio Augusto Barbieri, Sérgio Tosi Rodrigues, Paula Favaro Polastri, Ricardo Augusto Barbieri, Pedro Henrique Alves de Paula, Fabio Milioni, Paulo Eduardo Redkva, Alessandro Moura Zagatto
No abstract text is available yet for this article.
May 15, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28511799/towards-a-grand-unified-theory-of-sports-performance-a-response-to-the-commentaries
#16
Paul S Glazier
No abstract text is available yet for this article.
May 13, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28502384/sports-science-needs-more-interdisciplinary-constraints-led-research-programmes-the-case-of-water-safety-in-new-zealand
#17
C Button, J L Croft
In the lead article of this special issue, Paul Glazier proposes that Newell's constraints model has the potential to contribute to a grand unified theory of sports performance in that it can help to integrate the disciplinary silos that have typically operated in isolation in sports and exercise science. With a few caveats discussed in this commentary, we agree with Glazier's proposal. However, his ideas suggest that there is a need to demonstrate explicitly how such an integration might occur within applied scientific research...
May 11, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28501732/asymmetrical-stabilization-and-mobilization-exploited-during-static-single-leg-stance-and-goal-directed-kicking
#18
Adam C King, Zheng Wang
The motor control properties of the right and left legs are dependent on the stabilization and mobilization features of the motor tasks. The current investigation examined the right and left leg control differences - interlateral asymmetries - during static single leg stance and dynamic goal directed kicking with an emphasis of the asymmetrical stabilization and mobilization components of movements. Ten young, healthy, right-leg preferred individuals with minimal kicking experience completed both tests on each limb...
May 11, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28501422/desideratum-for-gut-a-functional-semantics-for-sport
#19
Maurici A Lopez-Felip, Michael T Turvey
No abstract text is available yet for this article.
May 10, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28500954/finger-forces-in-fastball-baseball-pitching
#20
Hiroshi Kinoshita, Satoshi Obata, Daiki Nasu, Koji Kadota, Tomoyuki Matsuo, Glenn S Fleisig
Forces imparted by the fingers onto a baseball are the final, critical aspects for pitching, however these forces have not been quantified previously as no biomechanical technology was available. In this study, an instrumented baseball was developed for direct measurement of ball reaction force by individual fingers and used to provide fundamental information on the forces during a fastball pitch. A tri-axial force transducer with a cable having an easily-detachable connector were installed in an official baseball...
May 10, 2017: Human Movement Science
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