جستجوی مقالات مرتبط با کلیدواژه « postural sway » در نشریات گروه « تربیت بدنی »

The aim of the present study is to compare the symmetry of postural sway while maintaining static balance in elderly women with and without poor central stability.

The statistical sample of the study was made up of 16 elderly women over 55 years of age, who were selected using available and targeted sampling. Subjects were placed on the force plate to perform balance analysis, and according to the protocol described in the balance evaluation process section, their posture sway were evaluated in the medio-lateral, anterior-posterior, and total directions. Independent t-tests were conducted using SPSS version 26 statistical software to compare the groups (P < 0.05).

The research showed that the postural sway of the left support leg in the medio-lateral direction (toward the medial side) and the right support leg in the anterior-posterior direction (toward the posterior side) in the group of elderly women with instability in the central region was higher (P < 0.05). Also, the average index of imbalance in both left and right limbs in both medio-lateral and anterior-posterior directions in two groups of elderly women with and without instability in the central region showed the greatest difference in the medio-lateral direction of the right leg (0.77 cm). Comparing the percentage of balance asymmetry index in the group of elderly women with and without instability in the central region also showed the greatest asymmetry in the medio-lateral direction (P = 0.010, 32.65%).

From the results of the present research, it can be stated that there is a significant difference between elderly women with and without poor central stability in the symmetry of postural sway while maintaining static balance. Considering that the asymmetry in postural sway has a direct relationship with the loss of balance and the increase of falling, exercises that lead to an increase in central stability and thus improve their physical posture should be considered in the daily training protocol of the elderly.

According to embodied cognition theory, cognitive processes originate from the areas of the brain involved in motor programing and execution and areas that are responsible for processing sensory inputs. According to the embodied cognition perspective, cognitive systems and perception-motor systems are deeply intertwined and exert a causal effect on each other. Therefore, cognitive activity should cause changes in observable movements. For this reason, in this study, we asked participants (20 females; M age= 21±4) to listen to sentences with action verbs while standing quietly on a balance board. We then examined the standard deviation (SD) and the mean within-trial of their center of pressure (CoP) while the participants were listening to the sentences. This test was repeated for three consecutive days.The analysis of standard deviation demonstrated that CoP fluctuations changed significantly from the baseline when participants listening to action verbs. However, none of the main effects were significant for the mean of CoP. Changes in CoP fluctuations relative to normal body fluctuations while participants were asked to stand quiet and listen only to sentences indicates how cognition and motor are intertwined which was reflected in their motor behavior.

Chronic musculoskeletal pain increases significantly with age. Back pain is the most common pain reported by elderly people in the world. Virtual reality (VR) technology has become increasingly prevalent in many spheres of knowledge, including healthcare rehabilitation. The aim of this study was to determine the effect of eight weeks of virtual reality training (VRT) on pain and postural control of elderly men with chronic nonspecific low back pain (CNLBP).

Thirty elderly patients with CNLBP in both experimental and control groups participated in this study. The experimental group performed 30 min VRT three times a week for eight weeks, and the control group continued their normal life routine during this period. Pain and center of pressure (CoP) variable were assessed before and after the intervention using visual analogue scale and foot pressure system, respectively. Paired sample t-test and one way analysis of covariance at SPSS software version 22 were used for data analysis (P<0.05).

The results of statistical analysis indicated that pain (P=0.001) and CoP variables (oscillation velocity (P=0.014), sway area (P=0.004), anterior-posterior displacement (P=0.000) and medial-lateral displacement (P=0.03)) in the experimental group had a significant decrease compared to the control after eight weeks.

According to the obtained results, the use of VRT with the aim of reducing pain and postural fluctuations is recommended to rehabilitation of geriatric with CNLBP.

Considering the importance of core stability training and the high prevalence of aspirin and ankle instability and the subsequent loss of balance and postural sway, as a risk factor in the occurrence of recurrent ankle sprain, doing core stability exercises to increase balance and improve postural sway, can have a significant role in reducing re-injury. The aim of this study was to investigate the effect of six weeks of core stability training on dynamic balance and postural sway men's basketball players with functional ankle instability.

male athletes with functional ankle instability basketball players participated in this study. After initial screening and identification of eligible athletes using performance questionnaire ankles, athletes into two groups (n = 12) and control (n = 12), respectively. The experimental group do of core stability training athletes for six weeks. The evaluation of dynamic balance and postural sway in both groups before and after the test was performed by test Y and the force plate.

Statistical tests showed that core stability training have significantly effect on dynamic balance and postural sway male basketball athlete's whit functional ankle instability (p≤0/05).

The addition of core stability training programs in therapeutic rehabilitation programs to ease restrictions men basketball players with functional ankle instability caused by this complication such as defects balance and postural sway, it is recommended.

Pronation distortion syndrome is one of the most common abnormalities in the body that causes distortions in the structures of the skeletal structures of the lower extremities and increases postural sways. The purpose of this study was to determine the effect of 12-week corrective exercises on postural sways in male students with pronation distortion syndrome. In this semi experimental research, 30 volunteers had pronation distortion syndrome, were selected and then randomly and equal divided into two groups of control and experimental (n=15). The experimental group performed corrective exercise consisting of inhibitory, stretching, strengthening, and integrated exercises for three months, but the control group carried out their routine exercise. The postural sways conterol were evaluated before and after of the three month of performing corrective exercises. Independent and dependent t-test were used to analyze the results (P≤0/05). The showed significant improvement in postural sways control and ground reaction force (P≤0/001), effect size 0.8 and 95% confidence interval after three months of corrective exercise, but in control group there was no significant difference (P≥0/05). In addition, after intervention, the experimental group were significantly lower in postural sways conterol and ground reaction force than the conterol group (P≤0/001), but this difference was not  significant in the pre-test (P≥0/05). It seems that systematic corrective exercise led to improve the activity of the muscles responsible for body sways conterol, which also reduces postural sways and ground reaction force in people with pronation distortion syndrome, so it is recommended that researchers, trainers, and specialists consider systematic corrective exercise in order to improve posture sways conterol and ground reaction force in people with pronation distortion syndrome.

Multiple sclerosis is a demyelinating disease that due to the involvement of multiple areas in central nercous system, including sensorimotor system can impair the patients,balance. Purpose of this study was to evaluate the effect of cognitive task on postural sway in multiple sclerosis patients. Twenty volunteer men and women with multiple sclerosis (mean ±SD age: 41.85± 12.59 years old and EDSS score 0-5) from Tehran multiple sclerosis association and twenty healthy adults (mean ±SD age: 46.52± 8/6 years old) were participated in this study and area of postural sway measured in 3 different level by static stabilometer. Repeated measurment test were used for statistical analysis (P

The purpose of present study was to determine the effect of different levels of balance task difficulty and visual feedback on balance in elderly women. Fourteen healthy elderly women (mean age 57/65 yr) were selected voluntarily. Participants were asked to stand still on a stability platform under each of two conditions (with visual feedback and without visual feedback) in three levels of difficulty (6, 8, 10). Stability index scores (Overall, Anterior- Posterior and Medial- Lateral) were calculated by Biodex Balance System. Duration of each test was 20 seconds and rest times were 20 seconds. Results showed that with increasing task difficulty, score of Medial- Lateral balance (p= 0/02) increased significantly. In addition, There was a significant reduction in the scores of Overall balance (p= 0/001), anterior - posterior balance (p= 0/01) and medial - lateral balance (p= 0/01) in visual feedback condition compared with without feedback condition. Overall, the results of this study showed that increasing task difficulty increases postural sway and availability of visual feedback can improve balance and reduce the postural sway.

The aim of the present study was to assess how increasing fatigue in standing balance task affects performance and the variability of postural sway. Fifteen young healthy men participants were asked to stand still on a force plate after three levels (40 50%, 60-70%, 80-90% max of heart rate) of Physical Activity. As physical activity intensity increased, the amplitude of postural sway also increased. In the antero-posterior axis and medio-lateral axis Fuzzy Entropy (variability) of postural sway decreased from the stable condition to three level of physical activity condition. Lower values of Fuzzy Entropy in postural sway during stable condition correlated with greater percent increases in postural sway in medio-lateral and antero-posterior axis from the standing still condition to the highest level of physical activity intensity condition. With fatigue, The structure of variability move to less flexibility And it makes the system less flexible and environmental constraints limited duty to adapt their show lower and decrease the performance qualitative level of postural control task.

The performance of postural tasks jeopardized consistency by some of the physiological constraints such as noise induced fatigue. The purpose of this study was to investigate the effect of fatigue levels on postural sway variability dynamic structure of people with different levels of physical activity. recurrence
quantification analysis (RQA) was used to compare the nonlinear dynamic structure of postural sway in three groups of students (n = 12), novice shooters (n = 6) and Skilled shooters (n = 6) after isometric fatigue. The frequency domain median parameter of EMG data and Borg scale of perceived fatigue was used as an indicator of fatigue. Analysis of variance with repeated measures was used to determine the effect of fatigue on the variability variables of the three groups. The results showed that fatigue had significant effect on the value of the total variability, while the values of recurrence rate, deterministic structure and trend of 3 groups significantly increased from percent 70 of fatigue. It seems that Consistent performance is created through compensatory variability strategy of motor Parameters and this effect will not be influenced by the level of physical activity. However, the main effect of group is indicative of more adaptability of the skilled athletes in the face of fatigue to maintain optimal performance.

The Aim of Present study was to examine effects of Attentional focus on performance (postural sways) and EMG’s changes. Thus, 10 Athletes (19-26 Years old) with at least 10 years experience in Gymnastics, in a counterbalanced manner performed under tow conditions of internal (focus on legs) and external (focus on stabilimeter plate) focus. In each condition, 10 trails 20 seconds conducted. Postural sways using Biodex Stabiliometer device and EMG signals using ME6000 recorded and analyzed using paired t test. Results showed no effects on balance performance of skill athletes and reduced EMG activity under external focus. Research findings (reduced EMG) supports Constraint action hypothesis. Although attentional Focus have no effects on balance performance of skilled athlete but it can have profound effects on motor behavior and the underlying neurophysiologic including completing action with more efficiency in external focus and skilled athletes will used its advantages at least in movement quality.