Moving pattern of point of application of vertical resultant force during level walking

Yamashita, Tadashi; Katoh, Ryozo

doi:10.1016/0021-9290(76)90128-7

Cited by 47 publications

(9 citation statements)

References 4 publications

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“…In previous works on gait initiation, the importance of the role of vertical ground reaction forces has not been fully recognized and explained. In some works, the authors used only one force platform and the main kinetic factor considered was the trajectory of the center of pressure (CP), which is the application point of the resultant vertical forces under both feet 18–23. In fact, CP displacements can be analyzed only through vertical forces under each foot.…”

Section: Discussionmentioning

confidence: 99%

Early postural adjustments associated with gait initiation and age‐related walking difficulties

2002

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To better understand the functional role of early postural adjustments associated with gait initiation, we studied ground reaction forces before the first step in a group of 10 young and 18 elderly normal subjects as well as in a group of 11 patients with marche à petits pas, an age-related gait disorder in which difficulties in executing the first step are encountered. Kinematic data and ground reaction forces were recorded synchronously and processed by an ELITE motion analysis system. Start difficulties in the patients might be explained by impaired amplitudes and directions of anteroposterior forces as well as smaller values of vertical forces than in the controls walking with comparable step lengths. Indeed, the abnormalities of anteroposterior forces lead to defective propulsive forces, whereas the smaller upward reaction forces make the elevation of the starting leg more difficult. These perturbations are likely to reflect impairments of muscular synergies of the lower limbs manifested by disturbances in the agonist-antagonist coupling, and lack of coordination between both limbs.

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Section: Discussionmentioning

confidence: 99%

Early postural adjustments associated with gait initiation and age‐related walking difficulties

2002

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“…Some other attempts to use ground force information for clinical examination, have been made in the past. The studies reported by Worist et al (1951), Marks and Hirschberg (1958), Hirsch and Goldie (1969), Gage (1964), Ismail (1968), Kruse et al (1971, Wadsworth (1973), Carlsoo et al (1974), PIaja et al ( ), Cappozzo et al (1976, Jacobs et al (1971), Yamashita andKatoh (1976), Robinson et al (1977), Bocardi et a/. (1977), Galante (1981), and Seliktar et al (1979) all offered different methods of processing and utilizing the force information.…”

Section: Introductionmentioning

confidence: 98%

Some Gait Characteristics of Below-Knee Amputees and Their Reflection on the Ground Reaction Forces

Seliktar

Mizrahi

1986

Engineering in Medicine

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Human locomotion studies employing cinematography and force plates have been conducted during the last five decades with the goal of producing a clinically acceptable gait evaluation technique. The bulk of information contained in the kinetic studies was the major obstacle in achieving this goal. Our aim in this work was to explore the possibility of representing some locomotor abnormalities solely by their reflection on the ground reaction force characteristics. As a first stage towards the establishment of these relationships, the gait characteristics of below-knee amputees were examined.One hundred and thirty ground force test results as obtained on twenty three below-knee amputees were analysed. Different variables such as time durations of the various phases, peak forces, impulses, rate of change of the forces, and others, were examined. The conclusions suggest that some of these variables are suitable for evaluation of gait and some, such as small perturbations superimposed on the curve, may serve as indicators of specific malfunction of the prosthetic system i

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“…These modes, propagating at different velocities, interfere to produce the senstivity nulls. Similar periodic sensitivity nulls have been observed in a normal two cable guided radar system when the cables were suspended in the air [13,14] and a theoretical, coupled-mode model has been used to determine the parameters which influence the spacing and depth of the nulls in a two cable system [15].…”

Section: Elevated Cablesmentioning

confidence: 92%

Performance Characteristics of Leaky Coaxial Cables.

Mason¹

1980

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Moving pattern of point of application of vertical resultant force during level walking

Cited by 47 publications

References 4 publications

Early postural adjustments associated with gait initiation and age‐related walking difficulties

Early postural adjustments associated with gait initiation and age‐related walking difficulties

Some Gait Characteristics of Below-Knee Amputees and Their Reflection on the Ground Reaction Forces

Performance Characteristics of Leaky Coaxial Cables.

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