How do people after stroke adapt step parameters and margins of stability at different walking speeds?

2020 ◽  
Vol 81 ◽  
pp. 136-137
Author(s):  
L. Hak ◽  
I. Blokland ◽  
H. Houdijk
Keyword(s):  
Walking Speeds ◽  
Step Parameters

scholarly journals The nature of functional variability in plantar pressure during a range of controlled walking speeds

2016 ◽  
Vol 3 (8) ◽  
pp. 160369 ◽  
Author(s):  
Juliet McClymont ◽  
Todd C. Pataky ◽  
Robin H. Crompton ◽  
Russell Savage ◽  
Karl T. Bates
Keyword(s):  
Linear Relationship ◽  
Froude Number ◽  
Plantar Pressure ◽  
Statistical Parametric Mapping ◽  
Major Axis ◽  
High Variability ◽  
The Body ◽  
Reduced Major Axis ◽  
Walking Speeds ◽  
Step Parameters

During walking, variability in step parameters allows the body to adapt to changes in substrate or unexpected perturbations that may occur as the feet interface with the environment. Despite a rich literature describing biomechanical variability in step parameters, there are as yet no studies that consider variability at the body–environment interface. Here, we used pedobarographic statistical parametric mapping (pSPM) and two standard measures of variability, mean square error (m.s.e.) and the coefficient of variation (CV), to assess the magnitude and spatial variability in plantar pressure across a range of controlled walking speeds. Results by reduced major axis, and pSPM regression, revealed no consistent linear relationship between m.s.e. and speed or m.s.e. and Froude number. A positive linear relationship, however, was found between CV and walking speed and CV and Froude number. The spatial distribution of variability was highly disparate when assessed by m.s.e. and CV: relatively high variability was consistently confined to the medial and lateral forefoot when measured by m.s.e., while the forefoot and heel show high variability when measured by CV. In absolute terms, variability by CV was universally low (less than 2.5%). From these results, we determined that variability as assessed by m.s.e. is independent of speed, but dependent on speed when assessed by CV.

Variance of Subcultures: A Comparison of Walking Speeds in a Midwestern Rural Community

1999 ◽  
Author(s):  
Pamela R. Tenney ◽  
Michelle L. Spurlock ◽  
Susan J. Shapiro
Keyword(s):  
Rural Community ◽  
Walking Speeds

scholarly journals Myofascial Release of the Hamstrings Improves Physical Performance—A Study of Young Adults

Healthcare ◽  
2021 ◽  
Vol 9 (6) ◽  
pp. 674
Author(s):  
Keisuke Itotani ◽  
Kanta Kawahata ◽  
Wakana Takashima ◽  
Wakana Mita ◽  
Hitomi Minematsu ◽  
...  
Keyword(s):  
Young Adults ◽  
Physical Performance ◽  
Walking Speed ◽  
Quadriceps Muscle ◽  
Lower Limbs ◽  
Joint Movement ◽  
Myofascial Release ◽  
Functional Reach Test ◽  
Hamstring Flexibility ◽  
Walking Speeds

Physical performance is mainly assessed in terms of gait speed, chair rise capacity, and balance skills, and assessments are often carried out on the lower limbs. Such physical performance is largely influenced by the strength of the quadriceps and hamstrings muscles. Flexibility of the hamstrings is important because quadriceps muscle activity influences the hip flexion angle. Therefore, hamstring flexibility is essential to improve physical performance. In this study, Myofascial Release (MFR) was applied to the hamstrings to evaluate its effects. MFR on the hamstrings was performed on 17 young adults. Physical function and physical performance were measured before, immediately after, and 5 days after the MFR intervention: finger floor distance (FFD), range of motion (ROM) of the straight leg raising test (SLR), standing long jump (SLJ), squat jump (SJ), functional reach test (FRT), comfortable walking speeds (C-walking speed), and maximum walking speeds (M-walking speed). The results of the analysis show a significant increase in FFD (−2.6 ± 8.9 vs. 0.4 ± 9.4 vs. 2.4 ± 8.9, p < 0.01), SLJ (185.6 ± 44.5 vs. 185.0 ± 41.8 vs. 196.6 ± 40.1, p < 0.01), and M-walking speed (2.9 ± 0.6 vs. 3.0 ± 0.6 vs. 3.3 ± 0.6, p < 0.01). This study has shown that MFR for hamstrings not only improves flexibility but also increases M-walking speed and physical performance of the SLJ. As MFR is safe and does not involve joint movement, it may be useful for maintaining and improving performance and flexibility during inactivity and for stretching before exercise.

Do humans exploit the metabolic and mechanical benefits of arm swing across slow to fast walking speeds?

2021 ◽  
Vol 115 ◽  
pp. 110181
Author(s):  
Shernice A. Thomas ◽  
Daisey Vega ◽  
Christopher J. Arellano
Keyword(s):  
Arm Swing ◽  
Fast Walking ◽  
Walking Speeds

scholarly journals Dynamic Asymmetries Do Not Match Spatiotemporal Step Asymmetries during Split-Belt Walking

Symmetry ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 1089
Author(s):  
Stefano Scarano ◽  
Luigi Tesio ◽  
Viviana Rota ◽  
Valeria Cerina ◽  
Luigi Catino ◽  
...  
Keyword(s):  
Lower Limb ◽  
Step Length ◽  
Centre Of Mass ◽  
Mean Velocity ◽  
Rehabilitation Research ◽  
Joint Dynamics ◽  
Stance Time ◽  
After Effect ◽  
The Mean ◽  
Step Parameters

While walking on split-belt treadmills (two belts running at different speeds), the slower limb shows longer anterior steps than the limb dragged by the faster belt. After returning to basal conditions, the step length asymmetry is transiently reversed (after-effect). The lower limb joint dynamics, however, were not thoroughly investigated. In this study, 12 healthy adults walked on a force-sensorised split-belt treadmill for 15 min. Belts rotated at 0.4 m s−1 on both sides, or 0.4 and 1.2 m s−1 under the non-dominant and dominant legs, respectively. Spatiotemporal step parameters, ankle power and work, and the actual mean velocity of the body’s centre of mass (CoM) were computed. On the faster side, ankle power and work increased, while step length and stance time decreased. The mean velocity of the CoM slightly decreased. As an after-effect, modest converse asymmetries developed, fading within 2–5 min. These results may help to decide which belt should be assigned to the paretic and the unaffected lower limb when split-belt walking is applied for rehabilitation research in hemiparesis.

Experimental Study of an Airplane Accident Evacuation/Rescue Simulation Using 3D Kinematic Digital Human Models

2014 ◽  
Author(s):  
Takao Kakizaki ◽  
Jiro Urii ◽  
Mitsuru Endo
Keyword(s):  
Test Field ◽  
Evacuation Simulation ◽  
Evacuation Time ◽  
Digital Human Models ◽  
Emergency Exit ◽  
Simulation Results ◽  
Evacuation Drills ◽  
Walking Speeds ◽  
Mass Evacuation ◽  
Digital Human

The 3D mass evacuation simulation of an airplane accident is experimentally verified. Evacuee motion has been experimentally investigated by building a test field that emulates the interior of an actual regional airliner with a capacity of approximately 100 passengers. The experiment results indicate that the evacuation time tends to be affected by the number of passengers and the evacuee guidance at the emergency exit. The results also indicate that any evacuation delay in exiting by individual passengers only slightly affects the total evacuation time because of evacuee congestion in the aisles. Moreover, the importance of evacuation guidance notification was investigated based on the evacuation-order variance. Finally, the experimental results were compared to the corresponding simulation results. Simulations using appropriate evacuee walking speeds can provide valid evacuation times, which are the most important factor in designing evacuation drills. Consequently, these results should be applied to existing 3D simulations using precise KDH models for more accurate mass evacuation/rescue simulations.

Exercise in the Treatment of Claudication: Assessment and Treatment of Functional Impairment

1997 ◽  
Vol 2 (3) ◽  
pp. 238-242 ◽  
Author(s):  
Judith G Regensteiner
Keyword(s):  
Functional Status ◽  
Training Programs ◽  
Meta Analysis ◽  
Exercise Program ◽  
Community Settings ◽  
Before And After ◽  
Assessment And Treatment ◽  
Walking Speeds ◽  
Walking Time ◽  
Efficacy Studies

Claudication is an important cause of impaired exercise capacity, which limits a patient's ability to walk and thus to meet the personal, social and occupational demands of daily life. Given that improvement of the walking impairment is the primary goal of treating claudication, exercise performance and functional status of patients with claudication should be measured before and after any intervention. Assessment of functional status in both the laboratory and community settings is important so that the various treatments can be judged as to relative efficacy. Studies have shown that exercise training programs have a clinically important impact on functional capacity in persons with claudication. A meta-analysis showed that pain-free walking time increased 180% and maximal walking time increased 120% in claudicants who participated in an exercise program. Substantial improvements have been found in walking speeds and distances (65% and 44%, respectively), caloric expenditure (31%) and physical functioning (67%).

scholarly journals Household accessibility to heat refuges: Residential air conditioning, public cooled space, and walkability

2016 ◽  
Vol 44 (6) ◽  
pp. 1036-1055 ◽  
Author(s):  
Andrew M Fraser ◽  
Mikhail V Chester ◽  
David Eisenman ◽  
David M Hondula ◽  
Stephanie S Pincetl ◽  
...  
Keyword(s):  
Los Angeles ◽  
Public Space ◽  
Urban Areas ◽  
Air Conditioning ◽  
Regional Climate ◽  
Heat Exposure ◽  
Household Level ◽  
Private And Public ◽  
Residential Air Conditioning ◽  
Walking Speeds

Access to air conditioned space is critical for protecting urban populations from the adverse effects of heat exposure. Yet there remains fairly limited knowledge of the penetration of private (home air conditioning) and distribution of public (cooling centers and commercial space) cooled space across cities. Furthermore, the deployment of government-sponsored cooling centers is likely to be inadequately informed with respect to the location of existing cooling resources (residential air conditioning and air conditioned public space), raising questions of the equitability of access to heat refuges. We explore the distribution of private and public cooling resources and access inequities at the household level in two major US urban areas: Los Angeles County, California and Maricopa County, Arizona (whose county seat is Phoenix). We evaluate the presence of in-home air conditioning and develop a walking-based accessibility measure to air conditioned public space using a combined cumulative opportunities-gravity approach. We find significant variations in the distribution of residential air conditioning across both regions which are largely attributable to building age and inter/intra-regional climate differences. There are also regional disparities in walkable access to public cooled space. At average walking speeds, we find that official cooling centers are only accessible to a small fraction of households (3% in Los Angeles, 2% in Maricopa) while a significantly higher number of households (80% in Los Angeles, 39% in Maricopa) have access to at least one other type of public cooling resource such as a library or commercial establishment. Aggregated to a neighborhood level, we find that there are areas within each region where access to cooled space (either public or private) is limited which may increase heat-related health risks.

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