Effect of 6-week karate (kihon) and basic movement exercise on balance performance in visually impaired individuals

Today, the participation of visually impaired individuals in sports activities is essential. Because the ability to move independently starts to develop with a delay in visually impaired individuals, physical activity is necessary to compensate for developmental delay, eliminate the problem of independent movement in social life by reducing obstacle perception problems, develop self-confidence, and provide regular muscle activation and motivation to move. The study investigated the effect of 6 weeks of karate (kihon) and basic movement training on balance performance in individuals with congenital visual impairment. Fifteen visually impaired individuals aged between 10 and 14 participated in the study, and three groups were formed: experiment 1, experiment 2, and the control group. After the pre-tests were taken, the experimental groups received karate and basic movement training in addition to physical education classes for 6 weeks, while the control group received only physical education classes. When the study results were examined, there were highly significant differences between the pre- and post-test values of the groups receiving karate and basic movement training. At the same time, no progress was observed in the control group. In the post-test comparison of the karate and control groups, positive significance was found in the values of the karate group. In the same way, in the post-test comparison of the basic movement training group and the control group, positive progress was made in the basic movement training group. The post-test comparison of the basic movement training and karate groups was the same. As a result, it was concluded that basic movement training and karate exercises applied for 6 weeks positively affected the balance development in visually impaired individuals aged 10-14 years. No difference was found between the exercise protocols regarding effectiveness, and no improvement was observed in individuals who did not participate in any exercise.

The influence of curricular physical activities on the values of body balance indices in university students

The investigation analyzes the effect of specific motor structures on the indicators of the static and dynamic balance of the students of Dunărea de Jos University in Galați (99 boys aged = 20.29 years, body weight = 84.17 kg, height = 180.08 cm, respectively 96 girls aged = 20.09 years, mass bodyweight = 60.88 kg, height = 164.73 cm. The members of the tested group have no concerns related to performance sports or physical activities as a lifestyle. The application of the experi-mental program was made during the 28 weeks of the academic year 2018-2019, with 3 distinct moments: T1 / initial at the beginning of the 1st semester, T2 / intermediate before the winter break, T3 / final at the end of the academic year. The battery of tests included 7 tests: One leg standing test with eyes closed (sec), Stork test (sec), Flamingo test (number of attempts), Bass test (points), Functional reach test (cm), Walk and turn field sobriety test (errors) and Fukuda test (degrees). The results of the Anova parametric test with repeated measurements revealed statis-tically significant values of F associated with critical thresholds (p <0.05), and the values of Parti-al eta squared (Ƞ2p) indicate strong influences of the proposed program on test performance in most cases, both at the level of the whole group and also for each gender. It should be noted that the performance improvements are greater in the first part of the study (differences between ini-tial and intermediate tests, with p <0.05), compared to those in semester 2 (differences between intermediate and final tests), which can be explained by the adaptation to the planned and ap-plied stimuli, so modifying or changing their dosage is necessary in order to have a better chan-ce of improving the results. Significant differences are confirmed for most tests of both genders (p <0.05), with exceptions being the Walk and turn field sobriety test for boys (at the level of the difference between intermediate and final testing) and the Fukuda test for both genders (for dif-ferences between initial and intermediate testing). However, the results should be viewed with caution, the low level of physical training and sedentary behavior of most students providing the premises for such progress, even with a single weekly physical activity. Keywords: students, balance, postural stability, physical exercise, progress, motor skills

Body Balance of Children and Youths with Visual Impairment (Pilot Study)

AIM

The study was designed to assess the effects of surface instability in the response of the balance control system in children and youths with visual impairment (BL) and in normally sighted controls (NE).

MATERIALS AND METHODS

The empirical research study involved 80 individuals, aged from 6 to 20 years, with a mean age of 14.37 (±4.68), including 40 blind individuals and a randomly selected control group 40 normally sighted. Stabilometric measurements were performed with the use of the Platform CQ Stab 2P, with eyes open (EO) and closed (EC) on the solid surface, and then, the same procedure was performed on the platform covered with 1-centimetre-thick foam.

RESULTS

Statistical analyses (Wilcoxon matched-pairs test, Mann-Whitney U test) of the results identified during the trials reveal the following findings in the BL group in the EO and EC tests. The results of the foam surface test were higher and the differences were statistically significant in the BL group (sway path EO p = 0.009, EC p = 0.006; mean amplitude EC p = 0.030; mean velocity EO p = 0.009, EC p = 0.006; sway area EO p = 0.017, EC p = 0.009; and number of COP deflections along the sagittal plane EO p = 0.004). No similar correlations were observed in the NE group, except for the mean amplitude EO p = 0.033 and sway area EO p = 0.030. There was one difference between the BL and the NE group for the mean amplitude parameter, p = 0.018, in a solid surface test with open eyes. The results were higher in the BL group.

CONCLUSIONS

The present study showed no worse balance in the BL group than in the NE group but worse performance on the foam than without it. It indicates the need to develop body balance skills in blind people by improving their proprioceptive sensitivity. In everyday life and training, blind people should experience exteroceptive stimuli, different textures, and unstable surfaces as much as possible.

The effects of balance and core stability training on postural control in people with visual impairment: A systematic review

Visual impairment is one of the most common functional impairments that considerably affects the postural control process and the ability to maintain balance. The purpose of this study was to perform a systematic review concerning the effects of balance and core stability training on postural control in individuals who are visually impaired. This article comprehensively reviewed studies on balance in individuals who are blind from the following databases: PubMed, Embase, Web of Science, and Scopus from 2007 to 2021. Inclusion and exclusion criteria were people who were blind or visually impaired (acquired and congenital), men and women, all ages, and at least 6 weeks balance or core stability training program. Twelve articles were included in this review. Individuals with visual impairment and blindness from all ages were included in this study. According to this review, all balance and core stability protocols in this article have positive effects on balance and postural control for individuals with visual impairments. Therefore, balance and core stability intervention for at least 6 weeks is one of the more well-established protocols for improving balance and postural control in people with visual impairment and can have a positive impact in risk of falling regardless of age, gender, or severity of visual impairment.

Examination of the Relationship Among Balance, Physical Activity, and Anthropometry in Athletes With Visual Impairments

Introduction

Although it is well documented in the literature that individuals with visual impairments have low physical activity levels and impaired body compositions and postural controls compared with peers without vision loss, the relation between these parameters in athletes with visual impairments is unknown.

Research Question

Here, we (i) evaluated the physical activity levels, balance measures, and anthropometry parameters in athletes with visual impairments and peers without vision loss controls and (ii) compared these variables between the two groups.

Methods

We designed a retrospective observational study with parallel groups conducted on 33 athletes with visual impairments and 33 sighted controls matched for age and sex. We also utilized a questionnaire about physical activity levels and assessed static balance for 4 conditions (eyes-open firm surface, eyes-closed firm surface, eyes-open foam surface, and eyes-closed foam surface) and anthropometry.

Results

In athletes with visual impairments, body composition, body mass index (BMI), physical activity level, and static balance parameters revealed no significant relationship ( p > .05), whereas eyes-open and -closed firm and foam surface conditions were positively related with physical activity at a moderate level ( r = 0.39, r = 0.38, p < .05, respectively). Moderate-intensity and high-intensity physical activity was positively associated with fat-free mass ( r = 0.82, r = 0.68, p < .01, respectively) and negatively related with body mass, fat %, and fat mass ( r = −0.67, r = −0.52, r = −0.72, r = −0.66, r = −0.50, r = −0.50, p < .01, respectively). Athletes with visual impairments presented lower static balance than the sighted controls for three conditions, while eyes-closed foam surface scores were similar in both groups. The physical activity levels were higher for athletes with visual impairments ( p < .05). However, we found no difference in the body composition and BMI between two groups ( p > .05).

Discussion

Sports participation from individuals with visual impairments is related to higher physical activity levels, resulting in better anthropometric profile. The balance control was not related to physical activity levels in athletes with visual impairments.

Role of vision in static balance in persons with and without visual impairments

BACKGROUND

Vision is one of the elements of the system responsible for maintaining static balance. Any visual impairments or conditions hampering the reception of visual stimuli may affect static balance. It would be interesting to identify to what extent people with different degrees of dysfunction and in different conditions are able to compensate for the inability to receive visual stimuli while maintaining balance.

AIM

The aim of this study was to determine the role of the vision in maintaining static balance. This study sought to assess balance and the degree of compensation when the possibility of receiving visual stimuli is limited in persons without visual impairments and persons with varying degrees of visual impairments.

DESIGN

Controlled observational study.

SETTING

Main University Laboratory.

POPULATION

The study included 122 individuals, 81 of whom were visually impaired. The participants with visual impairments were divided into three groups according to their levels of disability.

METHODS

Subjects performed tests on a stabilographic platform: standing on both feet with eyes open and closed, single right- and left-leg stance with eyes open and closed. The center of pressure path length and the visual inspection indicator were analysed. Significance of differences between the groups regarding the visual inspection indicator and tests performed with eyes open and closed was assessed with the use of the Mann-Whitney U test. The effects and interactions between variables were verified using the ANOVA test for the main effects and factorial designs.

RESULTS

Differences were noted in balance of persons without visual impairments in single-leg stance tests with eyes open and closed as well as when standing on both feet with eyes open and closed. In persons with visual impairment, significant differences were observed in the single left-leg stance test with eyes open and closed only. Testing conditions and disability levels exerted a significant influence on static balance in single-leg tests.

CONCLUSIONS

The findings of the study confirm the role of vision in maintaining balance in the context of factors that may affect it, i.e. conditions (eyes open or closed) and possibilities of receiving visual stimuli (disability level).

CLINICAL REHABILITATION IMPACT

The significance of the visual effect was noted in single-leg tests. More demanding tests detect compensatory mechanisms of balance more accurately.

Comparisons of Spatiotemporal and Ground Reaction Force Components of Gait Between Individuals with Congenital Vision Loss and Sighted Individuals

Introduction:

The understanding of abnormalities in biomechanical parameters of gait in individuals with vision loss (i.e., blindness or low vision) has clinical importance. The aims of this study were to compare the spatiotemporal and ground reaction force variables of sighted individuals with those with vision loss.

Methods:

Ten sighted males and 10 young males with congenital vision loss were recruited. A Vicon motion analysis system with four cameras and two Kistler force plates was used to quantify spatiotemporal and ground reaction force components of both groups during walking without shoes. Sighted individuals walked in eyes-open and eyes-closed conditions.

Results:

Results showed that the stride and step length, walking speed, the vertical and posterior–anterior reaction forces in heel contact and push-off phase, and the impulse of the control group during walking with the open- and closed-eyes conditions were significantly smaller than those in persons with vision loss ( p < .05).

Discussion:

Vision loss is associated with decreased step and stride length, slower walking, and smaller propulsive reaction force. These kinematic and kinetics alterations suggest an adaptation to a new neuromuscular response for dynamic postural control as a result of lack of vision. These alterations in the long term may result in rigidity and muscle weakness.

Implications for practitioners:

A rehabilitation program to enhance mobility and strength is suggested for individuals with vision loss.

Assessment of Motor Skills in Children With Visual Impairment: A Systematic and Integrative Review

This study aimed to review and examine the tools used to assess psychomotor performance of children with visual impairment. Databases, such as SCOPUS, MEDLINE/PubMed, Medline/EBSCO, Web of Science, LILACS, CINAHL, and ScienceDirect, were searched using Mesh terms. Data from manuscripts fully available in these databases between 1994 and 2017 (except CINAHL—2014) concerning the evaluation, tool development, or intervention for the improvement of motor skills in children (age, 7-10 years) with visual impairment were collected. The Critical Review Form—Quantitative Studies was used to evaluate the quality of the articles. As a result, 1113 articles were found, but only 24 met the inclusion criteria; 66.7% of the articles had moderate quality, with unsatisfactory results regarding the validity and reliability of the tools used to assess these children, as well as the absence of clinical importance and practical application in such studies. Only the Test of Gross Motor Development-2 and Movement Assessment Battery for Children-2 described data on the validation and reliability in visually impaired children. To minimize systematic errors and improve the quality of the investigations, increasing the number of studies regarding the tools, functionality of their activities, and testing the adaptions is necessary.

Interventions to improve functioning, participation, and quality of life in children with visual impairment: a systematic review

Visual impairment in childhood often has life-long implications. To aim for the highest levels of functioning, participation, and quality of life and to ensure children's well-being, children should be entitled to the most effective rehabilitation programs. We review evidence for the effectiveness of rehabilitation interventions for children with visual impairment to improve skills and behavior, thereby improving participation and quality of life as an ultimate goal. Of the 441 potentially relevant articles identified, 66 studies met our inclusion criteria (i.e., 28 randomized controlled trials, 18 nonrandomized controlled trials, and 20 before-after comparisons). The results suggest that sports camps, prescription and training in the use of low vision devices, and oral hygiene programs might be effective in improving functioning and elements of participation and quality of life in children with visual impairment. Other interventions showed mixed or negative results. The results should be interpreted with caution because of moderate to high risk of bias and suboptimal reporting. Heterogeneity of results and the use of over 50 different outcome measures prevented a meta-analysis. Future studies should focus on promising interventions for which effectiveness is still unclear (e.g., mobility, social skills), with adequately designed methodology.

Insight into falls prevention programmes for people with visual impairments and intellectual disabilities: A scoping review

The aim of this study was to review the current literature on falls prevention in people with visual impairment and to estimate the applicability of methods of fall prevention for people with visual impairment and intellectual disability. A scoping review was performed according to the Arksey and O’Malley framework. Relevant studies were collected from PubMed, Web of Science, and the Cochrane Register of Controlled Trials (CENTRAL). All records covering the time span from January 1980 until November 2017 were collected. Studies were included if the participants had a visual impairment according to objective ophthalmic assessments, the article described interventions to reduce falls or risk factors for falls, and the study was written in English and published in a peer-reviewed journal. The methodological quality of the studies were determined by consensus of the authors on the PEDro scale. Fifteen articles were included in this scoping review. Three articles focused on screening and intervention programmes, five articles addressed the effectiveness of environmental adjustments, and seven articles involved training programmes for physical improvement. Environmental adjustments emerged as having the best evidence for falls prevention for people with a visual impairment. Physical training programmes improved balance in those with a visual impairment but could not reduce the number of falls. Environmental adjustments also may be effective for persons with a visual impairment and intellectual disability. In addition, multifactorial screening and intervention programmes are recommended as an important new research direction with important clinical implications.

Development and validation of a yoga module for children with visual impairment: A feasibility study

Yoga has been found to be an effective intervention in children with visual impairment. Yoga modules used in previous studies were based on individual researcher’s experience. However, no mention was given of them being endorsed by other specialists in the field. This study aimed to develop, validate, and assess the feasibility of a yoga module exclusively for children with visual impairment. A yoga module was developed based on traditional and contemporary yoga literature and published studies with the objectives of determining needs of the participants and yoga practices that could prove efficient. Its validation was carried out with 25 experts over two rounds of iteration and feasibility of the practices evaluated on nine children with visual impairment. Tennis ball throw and standing vertical jump tests were done to evaluate success of yoga practice. A total of 30 yoga practices with content validity ratio ⩾ 0.37 were retained in the final yoga module. All experts opined that the final module is technically easy to teach, learn, and practice. All the children reported 80% of satisfaction level with the yoga practices and the procedure used to teach them at the end of the intervention. The score in tennis ball throw increased significantly ( p = .011) after the intervention, but the standing vertical jump score ( p = .585) did not. Positive exit survey responses and good participation rates support the module’s feasibility. Based on evidence from the traditional knowledge and scientific studies, the yoga module was validated for the children with visual impairment. The feasibility of the module was also assessed successfully which can be used safely and effectively as an alternative training for individuals with visual impairment.

Time-motion analysis of goalball players in attacks: differences of the player positions and the throwing techniques. Sports Biomech 2018;18:470-481. [PMID: 29578380 DOI: 10.1080/14763141.2018.1433871]

In this study, we aimed to analyse goalball players time-motion variables (distance covered, time spent, maximum and average velocities) in official goalball match attacks, taking into account the attack phases (preparation and throwing), player position (centres and wings) and throwing techniques (frontal, spin and between the legs). A total of 365 attacks were assessed using a video based method (2D) through manual tracking using the Dvideo system. Inferential non-parametric statistics were applied for comparison of preparation vs. throwing phase, wings vs. centres and, among the throwing techniques, frontal, spin and between the legs. Significant differences were found between the attack preparation versus the throwing phase for all player time-motion variables: distance covered, time spent, maximum player velocity and average player velocity. Wing players performed most of the throws (85%) and covered longer distances than centres (1.65 vs 0.31 m). The between the legs and the spin throwing techniques presented greater values for most of the time-motion variables (distance covered, time spent and maximum player velocity) than did the frontal technique in both attack phases. These findings provide important information regarding players' movement patterns during goalball matches that can be used to plan more effective training.

Adaptation of the MABC-2 Test (Age Band 2) for children with low vision

BACKGROUND

The tools used to assess motor performance in children with low vision often have no validity and reliability data concerning this population and use non-standardized modifications. Adaptations of these tools could help to identify motor problems and mitigate their effects.

AIM

To assess aspects of validity and reliability in an adaptation of the Movement ABC-2 Test (MABC-2) for children with low vision.

METHODS AND PROCEDURES

The research was undertaken in two stages: 1) application of the original MABC-2 to 10 children with low vision, adaptation and pilot test; 2) administration and re-administration of the adapted MABC-2 in 30 children with low vision. Inter-rater reliability and test-retest reliability were assessed with an intraclass correlation coefficient and Kappa index; internal consistency was assessed with Cronbach's alpha.

OUTCOMES AND RESULTS

Substantial to almost perfect inter-rater reliability was found between the component standard scores and a reasonable to excellent concordance rate in the classification of movement difficulty. The adapted tool has moderate internal consistency.

CONCLUSIONS AND IMPLICATIONS

The adapted MABC-2 Test has improved the assessment of motor performance in children with low vision.

The effects of trunk stabilization exercise using a Swiss ball in the absence of visual stimulus on balance in the elderly

[Purpose] This study was undertaken to investigate the effects of the balance exercises with a Swiss ball on static and dynamic balance abilities in elderly (≥65 years) subjects. [Subjects and Methods] Twenty elderly subjects with no relevant orthopedic history of a back condition were selected for trunk stabilization exercises with a Swiss ball (Thera-Band, USA). The subjects performed these trunk stabilization exercises for 20 minutes, five times per week for 4 weeks. The experimental group (n=10) was blindfolded during these balance exercises, while the control group control group (n=10) was not. [Results] The experimental group showed significant improvements in velocity in the evaluation of static balance and in time, total distance, and left/right movement distance in the evaluation of dynamic balance after the intervention, whereas the control group showed significant improvements in time in the evaluation of dynamic balance. A significant intergroup difference was observed after the intervention for velocity gain. [Conclusion] Exercising with a blindfold stimulates other senses by blocking visual information, and hence it enhances improvements in balance ability.