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Showing 6 results for Gait

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Volume 11, Issue 6 (10-2013)

Introduction and Purpose: The rate of overweight and obesity of childhood is dramatically increasing. It seems that mechanical load would affects motor activities for instance walking pattern. This study undertaken to compare spatio-temporal parameters of walking among overweight and normal childrens 10 to 12 years.
Methodology: In this semi-experimental study, 30 subjects (15 overweight boys and 15 normal boys) are randomly selected participated. Footprints recorded during walking with ink and paper system. In order to make comparison of spatio- temporal parameters of walking of subjects Independent Samples t-Test is used. Results: Significant difference was seen in three parameters spending time, speed and cadence between the two groups; in addition, there is significant difference in foot progressive angle between dominant and non dominant limbs.
Discussion and conclusion: According to the findings of this study, which confirms findings of previous studies, in order to optimize walking pattern perhaps overweight changes the pattern of gait through improvement of motor control.

Sasan Naderi, Dr Fariborz Mohammadi Pour, Dr Mohammad Reza Amir Seifo Dini,
Volume 13, Issue 9 (4-2015)

The purpose of current study was to investigate the spatio-temporal gait parameters and knee varus angle
during walking at different speeds in young with knee varus. 18 subjects with varus deformity classified at
grade 3 of bowleg and 17 healthy subjects, volunteered to participate in this study. The following variables
include stance, swing, double support and cycle time, cadence, stride length, angle of varus at the heel
contact, midstance and toe off when walking on the treadmill at speeds of 80, 100 and 120 percent of
preferred walking speed, were measured from using the three-dimensional motion analysis system with six
optoelectronic cameras. The results of between-group tests showed that spatio-temporal gait parameters
in the varus group is similar to the normal group. Also varus angular variables in varus group, was indicate
higher values in comparison to the healthy group, but there were no significant differences. The results of
inter-group tests also showed the knee varus angle generally increases with increasing speed, that none of
the differences were not significant. According to the results, the increase in walking speed will caused to
increase knee varus angle. Therefore, walking with speed less than the normal walking speed, probably is
a suitable solution to reduce the loads exerted on the knee joint and prevention of premature osteoarthritis
in young with knee varus.

Mr Abbas Farjad Pezeshk, Dr Heydar Sadeghi,
Volume 14, Issue 11 (4-2016)

Introduction and Objectives. The trajectory of center of pressure (COP) during the stance phase of gait is considered as an important parameter in assessing of dynamic balance, foot and ankle function and effectiveness of shoe and orthotics. The aim of this study was to determine the COP trajectory during stance phase of gait in healthy males and females, by means of Pedar-X plantar pressure measurement apparatus.Methods: 15 healthy adult females who didn’t have any history of injury that altered their normal gait pattern and trajectory of COP, participated in this study. The coordinate of COP in transverse (X) and vertical (Y) axes were measured using Pedar-X system. The stance phase of gait divided into the four sections by key points of acceleration vector in Y direction and then position, velocity and acceleration of COP at these portions were computed. To statically analysis, Descriptive statistic (Mean and standard deviation), Pearson correlation coefficient and ICC coefficient were used  (P≤0.05). Results and Discussion: The results indicated that during stance phase of gait, COP moves forward and medial in Y and X axes, respectively. Significant, strong but negative correlation seen between COP coordinates in X and Y axes. High Inter Class Correlation also showed between trials reliability for Pedar-X system in estimation of COP coordinates. Conclusion:  The results of this study could be used as a standard norm of trajectory of COP in healthy adult subjects

S Entezari, R Memar, M Kakavand,
Volume 15, Issue 13 (9-2017)

The aim of this study was the comparison of plantar pressure distribution, vertical ground reaction force and contact area between dominant and none-dominant limb in top-flight females taekwondo.10 healthy young top-flight females taekwondo were selected. plantar pressure ,vertical ground reaction force and contact area were evaluated by emed system .The obtained data were analyzed by paired -t test and Symmetry index significance difference in toes 3-5 contact area between dominant and none dominant limb In addition Symmetry index for each parameter indicate asymmetry between limbs. The most ground reaction force and plantar pressure applied on heel region and metatarsal 3-5 and the least ground reaction force and plantar pressure applied on toe 2and toes3-5 in both limb.

M Termeh, A Ghanbarzadeh, M.h Honarvar, K Heidari Shirazi,
Volume 18, Issue 19 (7-2020)

In a walking cycle design, maximizing the upright balance should be considered in addition to the kinematic constraints, energy consumption rate must be considered. The purpose of this study is to find the optimal step length obtained for each person according to the physical features. In this research, in order to minimize energy consumption rate by considering maximum balance two cost function were defined. the fall cost function was designed based on the concept of MOS and balance index. To investigate the upright balance and to reconstruct the movement pattern, Data from normal walking gait of healthy subjects was taken and seven links model was defined. In this study, the optimal step length was obtained for the person with height, weight and gait cycle characteristics. it is shown that for a person of 92kg mass and 1.87 meters height, the best step length in walking would be 0.54 meters. In this study, the kinematic and kinetic characteristics of human motion were identified by the analysis of gait patterns on a treadmill. Through the calculation of the balance index, individuals are helped to find the optimal step length for which the maximum balance is achieved. The results of the study can provide the optimal step length to correct the gait pattern.

Dr Shirin Yazdani, Prof Nader Farahpour,
Volume 19, Issue 21 (9-2021)

 Background and Objective: although it is documented that the spine and hip alignments alter in scoliosis subjects, but the effect of these changes on the lower extremities’ biomechanics have not been well understood yet. So, the aim of this study was to compare hip, knee and ankle joint’s power generation and absorption during gait in patients with adolescent idiopathic scoliosis (AIS) and healthy controls.  Methods: Using motion analysis system with 4 Vicon-460 cameras and two Kistler force plates, the kinematics and kinetics of gait was assessed in twenty girls with AIS and 20 matched healthy controls, then the power of the right and left hip, knee and ankle joints in sagittal plane was calculated. Data was analyzed using ANOVA statistical method with significance level of α<0.05. Results: Results showed that in scoliosis group, the peak power absorption of the right knee was significantly 12.5% smaller than that in control group (p=0.01). But, peak power generation and absorption of the hip and ankle joints in both right and left limbs were not statistically differed between the two groups (p>0.05). Conclusion: scoliosis is associated with the smaller power absorption of the knee joint at convex side. This might be linked with unilateral alterations of the joints' moment, joint forces, and the related muscle activity which might impose asymmetrical force to the hip and cause curve progression.

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