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stride frequency

Tatsuro Amano, Masaki Ishitobi, Yukio Ogura, Yoshimitsu Inoue, Shunsaku Koga, Takeshi Nishiyasu, Narihiko Kondo
Changing stride frequency may influence oxygen uptake and heart rate during running as a function of running economy and central command. This study investigated the influence of stride frequency manipulation on thermoregulatory responses during endurance running. Seven healthy endurance runners ran on a treadmill at a velocity of 15km/h for 60min in a controlled environmental chamber (ambient temperature 27°C and relative humidity 50%), and stride frequency was manipulated. Stride frequency was intermittently manipulated by increasing and decreasing frequency by 10% from the pre-determined preferred frequency...
October 2016: Journal of Thermal Biology
Alireza Sarkaki, Yaghoob Farbood, Mojtaba Dolatshahi, Seyed Mohammad Taqhi Mansouri, Ali Khodadadi
Antioxidants have protective effects against free radicals-induced neural damage in Parkinson's disease (PD). We examined the effects of ellagic acid (EA) on locomotion, pallidal local EEG, and its frequency bands' power and also cerebral antioxidant contents in a rat model of PD induced by 6-hydroxidopamine (6-OHDA). 6-OHDA (16 µg/2µ l) was injected into the right medial forebrain bundle (MFB) in MFB-lesioned rat's brain. Sham group received vehicle instead of 6-OHDA. PD-model was confirmed by rotational test using apomorphine injection...
August 2016: Acta Medica Iranica
Thijs Maria Anne Ackermans, Gaspar Epro, Christopher McCrum, Kai Daniel Oberländer, Frank Suhr, Maarten Robert Drost, Kenneth Meijer, Kiros Karamanidis
PURPOSE: We aimed to determine whether there are different changes in Achilles tendon (AT) mechanical properties in middle-aged, compared to younger runners that might indicate that tendon fatigue, induced by long-distance running, is age-dependent. METHODS: 27 middle-aged (50-67 years) and 22 younger (21-29 years) participants ran a 21 km route at their own pace (mean and SD: old: 3.1 ± 0.3 m s(-1); young: 3.6 ± 0.5 m s(-1)). We tested for changes in the AT force-elongation relationship using dynamometry and ultrasonography during isometric voluntary ankle plantarflexion ramp contractions, conducted 20-28 h pre-run, immediately pre-run, immediately post-run and 20-28 h post-run...
September 30, 2016: European Journal of Applied Physiology
Bernard Auvinet, Claude Touzard, Vincent Goëb
OBJECTIVE: Gait disorders are associated with increased fall risk, dementia and loss of autonomy. Gait analysis has previously been validated in the identification of motor phenotypes in mild cognitive impairment [1]. We hypothesized that gait analysis under dual-task conditions in elderly patients with gait disorders might allow the identification of motor phenotypes linked to specific brain abnormalities. MATERIAL/PATIENTS AND METHODS: An observational study was instructed for elderly patients with gait disorders or memory impairment...
September 2016: Annals of Physical and Rehabilitation Medicine
Michael Neal, Neil Fleming, Lindsey Eberman, Kenneth Games, Jeremiah Vaughan
Study Design Controlled laboratory study. Background Body-weight-support (BWS) running is increasing in popularity, despite limited evidence of its effects on running mechanics. Objectives To determine the effect of increasing BWS on lower-limb biomechanics during lower-body positive-pressure (LBPP) treadmill running. Methods Fourteen male recreational runners completed 15 randomized trials on an LBPP treadmill at 5 levels of BWS and 3 velocities (1-minute trials with 3-minute recovery). Knee and ankle kinematic data were recorded continuously via electrogoniometry...
September 2016: Journal of Orthopaedic and Sports Physical Therapy
Claire M Barnes, Cain C T Clark, Mark D Holton, Gareth Stratton, Huw D Summers
INTRODUCTION: The aim was to establish children's mechanical movement patterns during a standardised assessment of fitness by means of an accelerometer. Further to this, our objective was to use the information from the accelerometer to profile individual time courses of exercise, across the cohort. METHODS: A multi-stage fitness test study was performed with 103 children, aged 10.3 years ± 0.6y. Children wore an ankle mounted accelerometer and gait data was collected on radial acceleration traces obtained at a frequency of 40 Hz...
August 30, 2016: Medicine and Science in Sports and Exercise
Jason R Franz, Carrie Francis, Matt Allen, Darryl G Thelen
Visuomotor entrainment, or the synchronization of motor responses to visual stimuli, is a naturally emergent phenomenon in human standing. Our purpose was to investigate the prevalence and resolution of visuomotor entrainment in walking and the frequency-dependent response of walking balance to perturbations. We used a virtual reality environment to manipulate optical flow in ten healthy young adults during treadmill walking. A motion capture system recorded trunk, sacrum, and heel marker trajectories during a series of 3-min conditions in which we perturbed a virtual hallway mediolaterally with systematic changes in the driving frequencies of perceived motion...
August 26, 2016: IEEE Transactions on Neural Systems and Rehabilitation Engineering
Caroline Praz, Benedikt Fasel, Philippe Vuistiner, Kamiar Aminian, Bengt Kayser
PURPOSE: The aim of this study is to describe the effects of speed and gradient during uphill ski mountaineering on energy expenditure, to relate any changes to changes in stride characteristics, and to determine an optimal gradient and speed allowing minimization of energy expenditure. METHODS: 11 subjects were tested on snowy trails using their mountaineering skis (fitted with skins), boots and poles, at three gradients (7, 11 and 33 %) at 80 % of maximum heart rate (HRmax), and at 11 % also at 90 and 100 % of HRmax...
October 2016: European Journal of Applied Physiology
Marcus Fraga Vieira, Gustavo Souto de Sá E Souza, Georgia Cristina Lehnen, Fábio Barbosa Rodrigues, Adriano O Andrade
The purpose of this study was to determine whether general fatigue induced by incremental maximal exercise test (IMET) affects gait stability and variability in healthy subjects. Twenty-two young healthy male subjects walked in a treadmill at preferred walking speed for 4min prior (PreT) the test, which was followed by three series of 4min of walking with 4min of rest among them. Gait variability was assessed using walk ratio (WR), calculated as step length normalized by step frequency, root mean square (RMSratio) of trunk acceleration, standard deviation of medial-lateral trunk acceleration between strides (VARML), coefficient of variation of step frequency (SFCV), length (SLCV) and width (SWCV)...
October 2016: Journal of Electromyography and Kinesiology
Taryn Klarner, Trevor S Barss, Yao Sun, Chelsea Kaupp, Pamela M Loadman, E Paul Zehr
Rhythmic arm and leg (A&L) movements share common elements of neural control. The extent to which A&L cycling training can lead to training adaptations which transfer to improved walking function remains untested. The purpose of this study was to test the efficacy of A&L cycling training as a modality to improve locomotor function after stroke. Nineteen chronic stroke (>six months) participants were recruited and performed 30 minutes of A&L cycling training three times a week for five weeks. Changes in walking function were assessed with (1) clinical tests; (2) strength during isometric contractions; and (3) treadmill walking performance and cutaneous reflex modulation...
2016: Neural Plasticity
Joel A Walsh, James P Dawber, Romuald Lepers, Marc Brown, Paul J Stapley
This study sought to determine whether prior moderate intensity cycling is sufficient to influence the cardiorespiratory and biomechanical responses during subsequent running. Cardiorespiratory and biomechanical variables measured after moderate intensity cycling were compared with control running at the same intensity. Eight highly trained, competitive triathletes completed two separate exercise tests; 1) a 10-min control run (no prior cycling) and, 2) a 30-min transition run (preceded by 20-min of variable cadence cycling; i...
July 7, 2016: Journal of Strength and Conditioning Research
Kimberley S van Schooten, Mirjam Pijnappels, Sietse M Rispens, Petra J M Elders, Paul Lips, Andreas Daffertshofer, Peter J Beek, Jaap H van Dieën
Falls can have devastating consequences for older people. We determined the relationship between the likelihood of fall incidents and daily-life behavior. We used wearable sensors to assess habitual physical activity and daily-life gait quality (in terms of e.g. stability, variability, smoothness and symmetry), and determined their predictive ability for time-to-first-and-second-falls. 319 older people wore a trunk accelerometer (Dynaport MoveMonitor, McRoberts) during one week. Participants further completed questionnaires and performed grip strength and trail making tests to identify risk factors for falls...
2016: PloS One
Brian Hanley, Athanassios Bissas
The aim of this study was to analyse lower limb work patterns in world-class race walkers. Seventeen male and female athletes race walked at competitive pace. Ground reaction forces (1000 Hz) and high-speed videos (100 Hz) were recorded and normalised joint moments, work and power, stride length, stride frequency and speed estimated. The hip flexors and extensors were the main generators of energy (24.5 J (±6.9) and 40.3 J (±8.3), respectively), with the ankle plantarflexors (16.3 J (±4.3)) contributing to the energy generated during late stance...
July 8, 2016: Journal of Sports Sciences
John Lees, James Gardiner, James Usherwood, Robert Nudds
Understanding how animals move within their environment is a burgeoning field of research. Despite this, relatively basic data, such as the locomotor speeds that animals choose to walk at in the wild, are sparse. If animals choose to walk with dynamic similarity, they will move at equal dimensionless speeds, represented by Froude number (Fr). Fr may be interpreted from simple limb kinematics obtained from video data. Here, using Internet videos, limb kinematics were measured in 112 bird and mammal species weighing between 0...
2016: Scientific Reports
Leland Barker, Josh Bailey, Michael Soucy, Kendall Galor, John Mercer
No abstract text is available yet for this article.
May 2016: Medicine and Science in Sports and Exercise
Joshua P Bailey, Leland Barker, Kendell Galor, Michael Soucy, John A Mercer
No abstract text is available yet for this article.
May 2016: Medicine and Science in Sports and Exercise
Jacqueline Morgan, Robert L Franco, Kate Harrison, Anson M Blanks, Heather L Caslin, D S Blaise Williams
No abstract text is available yet for this article.
May 2016: Medicine and Science in Sports and Exercise
John A Mercer, Tiffany Mata, Michael Soucy, Leland Barker, Josh Bailey
No abstract text is available yet for this article.
May 2016: Medicine and Science in Sports and Exercise
Joe Warne, Kieran Moran, Giles Warrington
No abstract text is available yet for this article.
May 2016: Medicine and Science in Sports and Exercise
Manuela Schmidt, Martin Mehlhorn, Martin S Fischer
Studies into the function of structures are crucial for making connections between morphology and behaviour of organisms, but are still rare for the terrestrial Testudinidae. We investigated the kinematics of shoulder girdle and forelimb motion in Hermann's tortoise Testudo hermanni using biplanar X-ray fluoroscopy with a twofold aim: firstly, to understand how the derived shapes of shoulder girdle and carapace together influence rotation of the girdle; and, secondly, to understand how girdle rotation affects forelimb excursion...
September 1, 2016: Journal of Experimental Biology
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