scholarly journals Analysis of vertical ground reaction force variables during a Sit to Stand task in participants recovering from a hip fracture

2011 ◽  
Vol 26 (5) ◽  
pp. 470-476 ◽  
Author(s):  
Jeff Houck ◽  
Janet Kneiss ◽  
Susan V. Bukata ◽  
J. Edward Puzas
Keyword(s):  
Hip Fracture ◽  
Ground Reaction Force ◽  
Reaction Force ◽  
Vertical Ground Reaction Force ◽  
Sit To Stand ◽  
Vertical Ground

The effect of total hip and hip resurfacing arthroplasty on vertical ground reaction force and impulse symmetry during a sit-to-stand task

2014 ◽  
Vol 29 (10) ◽  
pp. 1164-1169 ◽  
Author(s):  
N. Caplan ◽  
S. Stewart ◽  
S. Kashyap ◽  
P. Banaszkiewicz ◽  
A. St Clair Gibson ◽  
...  
Keyword(s):  
Ground Reaction Force ◽  
Reaction Force ◽  
Hip Resurfacing ◽  
Vertical Ground Reaction Force ◽  
Hip Resurfacing Arthroplasty ◽  
Total Hip ◽  
Resurfacing Arthroplasty ◽  
Sit To Stand ◽  
Vertical Ground

scholarly journals The effects of upper and lower limb position on symmetry of vertical ground reaction force during sit-to-stand in chronic stroke subjects

2018 ◽  
Vol 30 (2) ◽  
pp. 242-247
Author(s):  
Jae Hong Lee ◽  
Dong Ki Min ◽  
Han Seong Choe ◽  
Jin Hwan Lee ◽  
So Hong Shin
Keyword(s):  
Ground Reaction Force ◽  
Lower Limb ◽  
Reaction Force ◽  
Chronic Stroke ◽  
Vertical Ground Reaction Force ◽  
Limb Position ◽  
Sit To Stand ◽  
Vertical Ground

Evaluation of Influence of Assisting Speed of Nursing Care Robot on Sit-to-Stand Movement through Vertical Ground Reaction Force

2016 ◽  
Vol 2016 (0) ◽  
pp. 2P1-02b5
Author(s):  
Tianyi Wang ◽  
Hieyong Jeong ◽  
Takafumi Ohno ◽  
Soichiro Watanabe ◽  
Michiko Kido ◽  
...  
Keyword(s):  
Nursing Care ◽  
Ground Reaction Force ◽  
Reaction Force ◽  
Vertical Ground Reaction Force ◽  
Sit To Stand ◽  
Vertical Ground

scholarly journals Running ground reaction forces across footwear conditions are predicted from the motion of two body mass components

2019 ◽  
Vol 126 (5) ◽  
pp. 1315-1325 ◽  
Author(s):  
Andrew B. Udofa ◽  
Kenneth P. Clark ◽  
Laurence J. Ryan ◽  
Peter G. Weyand
Keyword(s):  
Ground Reaction Force ◽  
Lower Limb ◽  
Reaction Force ◽  
Ground Reaction Forces ◽  
Vertical Ground Reaction Force ◽  
Time Patterns ◽  
Foot Strike ◽  
Reaction Forces ◽  
Vertical Ground ◽  
Force Time

Although running shoes alter foot-ground reaction forces, particularly during impact, how they do so is incompletely understood. Here, we hypothesized that footwear effects on running ground reaction force-time patterns can be accurately predicted from the motion of two components of the body’s mass (mb): the contacting lower-limb (m1 = 0.08mb) and the remainder (m2 = 0.92mb). Simultaneous motion and vertical ground reaction force-time data were acquired at 1,000 Hz from eight uninstructed subjects running on a force-instrumented treadmill at 4.0 and 7.0 m/s under four footwear conditions: barefoot, minimal sole, thin sole, and thick sole. Vertical ground reaction force-time patterns were generated from the two-mass model using body mass and footfall-specific measures of contact time, aerial time, and lower-limb impact deceleration. Model force-time patterns generated using the empirical inputs acquired for each footfall matched the measured patterns closely across the four footwear conditions at both protocol speeds ( r2 = 0.96 ± 0.004; root mean squared error  = 0.17 ± 0.01 body-weight units; n = 275 total footfalls). Foot landing angles (θF) were inversely related to footwear thickness; more positive or plantar-flexed landing angles coincided with longer-impact durations and force-time patterns lacking distinct rising-edge force peaks. Our results support three conclusions: 1) running ground reaction force-time patterns across footwear conditions can be accurately predicted using our two-mass, two-impulse model, 2) impact forces, regardless of foot strike mechanics, can be accurately quantified from lower-limb motion and a fixed anatomical mass (0.08mb), and 3) runners maintain similar loading rates (ΔFvertical/Δtime) across footwear conditions by altering foot strike angle to regulate the duration of impact. NEW & NOTEWORTHY Here, we validate a two-mass, two-impulse model of running vertical ground reaction forces across four footwear thickness conditions (barefoot, minimal, thin, thick). Our model allows the impact portion of the impulse to be extracted from measured total ground reaction force-time patterns using motion data from the ankle. The gait adjustments observed across footwear conditions revealed that runners maintained similar loading rates across footwear conditions by altering foot strike angles to regulate the duration of impact.

Agreement of spatio-temporal gait parameters between a vertical ground reaction force decomposition algorithm and a motion capture system

2016 ◽  
Vol 43 ◽  
pp. 257-264 ◽  
Author(s):  
Louis-Nicolas Veilleux ◽  
Maxime Raison ◽  
Frank Rauch ◽  
Maxime Robert ◽  
Laurent Ballaz
Keyword(s):  
Motion Capture ◽  
Ground Reaction Force ◽  
Reaction Force ◽  
Decomposition Algorithm ◽  
Motion Capture System ◽  
Vertical Ground Reaction Force ◽  
Gait Parameters ◽  
Vertical Ground ◽  
Spatio Temporal ◽  
Force Decomposition

Carrying loads with springy poles

1991 ◽  
Vol 71 (3) ◽  
pp. 1119-1122 ◽  
Author(s):  
R. Kram
Keyword(s):  
Oxygen Consumption ◽  
Ground Reaction Force ◽  
Oxygen Consumption Rate ◽  
Consumption Rate ◽  
Reaction Force ◽  
Load Carriage ◽  
Vertical Ground Reaction Force ◽  
Suspension Systems ◽  
Vertical Ground ◽  
Male Subjects

People throughout Asia use springy bamboo poles to carry the loads of everyday life. These poles are a very compliant suspension system that allows the load to move along a nearly horizontal path while the person bounces up and down with each step. Could this be an economical way to carry loads inasmuch as no gravitational work has to be done to lift the load repeatedly? To find out, an experiment was conducted in which four male subjects ran at 3.0 m/s on a motorized treadmill with no load and while carrying a load equal to 19% body wt with compliant poles. Oxygen consumption rate, vertical ground reaction force, and the force exerted by the load on the shoulders were measured. Oxygen consumption rate increased by 22%. The same increase has previously been observed when loads are carried with a backpack. Thus compliant poles are not a particularly economical method of load carriage. However, pole suspension systems offer important advantages: they minimize peak shoulder forces and loading rates. In addition, the peak vertical ground reaction force is only slightly increased above unloaded levels when loads are carried with poles.

385 EFFECT OF RATE OF ECCENTRIC EXERCISE ON PLASMA SUBSTANCE P AND PEAK VERTICAL GROUND REACTION FORCE

1994 ◽  
Vol 26 (Supplement) ◽  
pp. S69
Author(s):  
P. L Flynn ◽  
M. Sothmann ◽  
P. Schot ◽  
A. Snydor
Keyword(s):  
Substance P ◽  
Eccentric Exercise ◽  
Ground Reaction Force ◽  
Reaction Force ◽  
Vertical Ground Reaction Force ◽  
Vertical Ground

scholarly journals The Relationship Between Vertical Loadrates and Tibial Acceleration Across Footstrike Patterns

2018 ◽  
Vol 3 (3) ◽  
pp. 2473011418S0020 ◽  
Author(s):  
Irene Davis ◽  
Todd Hayano ◽  
Adam Tenforde
Keyword(s):  
Impact Loading ◽  
Ground Reaction Force ◽  
Reaction Force ◽  
Force Plate ◽  
Correlation Coefficients ◽  
Strongly Correlated ◽  
Vertical Ground Reaction Force ◽  
Vertical Ground ◽  
Tibial Acceleration ◽  
The Relationship

Category: Other Introduction/Purpose: While the etiology of injuries is multifactorial, impact loading, as measured by the loadrate of the vertical ground reaction force has been implicated. These loadrates are typically measured with a force plate. However, this limits the measure of impacts to laboratory environments. Tibial acceleration, another measure of running impacts, is considered a surrogate for loadrate. It can be measured using new wearable technology that can be used in a runner’s natural environment. However, the correlation between tibial acceleration measured from mobile devices and vertical ground reaction force loadrates, measured from forceplates, is unknown. The purpose of this study was to determine the correlation between vertical and resultant loadrates to vertical and resultant tibial acceleration across different footstrike patterns (FSP) in runners. Methods: The study involved a sample of convenience made up of 169 runners (74 F, 95 M; age: 38.66±13.08 yrs) presenting at a running injury clinic. This included 25 habitual forefoot strike (FFS), 17 midfoot strike (MFS) and 127 rearfoot strike (RFS) runners. Participants ran on an instrumented treadmill (average speed 2.52±0.25 m/s), with a tri-axial accelerometer attached at the left distal medial tibia. Only subjects running with pain <3/10 on a VAS scale during the treadmill run were included to reduce the confounding effect of pain. Vertical average, vertical instantaneous and resultant instantaneous loadrates (VALR, VILR and RILR) and peak vertical and resultant tibial accelerations (VTA, RTA) were averaged for 8 consecutive left steps. Correlation coefficients (r) were calculated between tibial accelerations and loadrates. Results: All tibial accelerations were significantly correlated across all loadrates, with the exception of RTA with VILR for FFS (Table 1) which was nearly significant (p=0.068). Correlations ranged from 0.37-0.82. VTA was strongly correlated with all loadrates (r = 0.66). RTA was also strongly correlated with both loadrates for RFS and MFS, but only moderately correlated with loadrates for FFS (r = 0.47). Correlations were similar across the different loadrates (VALR, VILR, RILR). Conclusion: The stronger correlation between vertical tibial acceleration and all loadrates (VALR, VILR, RILR) suggests that it may be the best surrogate for loadrates when studying impact loading in runners.

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