Development of a new index of strength in adults with intellectual and developmental disabilities

Cut-off points for isometric handgrip and low limb explosive strength in relation to indicators of overweight/obesity in people with intellectual disabilities: analysis by age groups

BACKGROUND

The prevalence of overweight/obesity has been increasing globally and in people with Intellectual Disabilities (IDs), this problem is exacerbated even more, which added to a low physical condition that contributes to the deterioration of functionality and increases the risk of developing chronic diseases in the course of life. Therefore, the aim of this study was to establish cut-off points for levels of isometric handgrip and low limb explosive strength in children, adolescents and adults, which identify overweight/obesity in people with IDs and their respective associations.

METHODS

The sample was made up of 131 individuals with IDs, belonging to four special and community educational centres in the city of Santiago, Chile. Body mass index (BMI) and waist-to-height ratio (WHR) were used as indicators of overweight/obesity. Handgrip strength was used as a measure of isometric strength, and countermovement jump was used as a measure of low limb explosive strength. For the comparison of variables by age group, the analysis of Ancova, Kruskal-Wallis and chi-square tests were used. The total area under the receiver operating characteristic curve of isometric handgrip and low limb explosive strength was identified as an indicator of overweight/obesity according to age groups. A logistic regression model was used to quantify the effect that strength categories below the cut-off point have on the risk of overweight and obesity.

RESULTS

Significant differences were observed between the age groups for body weight, height, BMI and WHR, as well as in the levels of absolute handgrip strength and vertical jump with countermovement (P ≤ 0.05). Children showed the lowest cut-off points for absolute and relative strength. The adolescent group showed the highest cut-off points for relative strength and countermovement jump and adults showed the highest value for absolute strength as indicators of overweight/obesity. Different associations between cut-off points with BMI and WHR were found.

CONCLUSIONS

Adolescents showed the highest cut-off point for relative strength and countermovement jump, and adults showed the highest value for absolute strength, according to overweight/obesity indicators (BMI and WHR). It is suggested to adjust resistance training programmes according to age categories for the prevention of overweight/obesity in people with IDs.

Aquatic exercise for people with intellectual disabilities: findings from a systematic review

Background: There is a need for promoting exercise practice among people with intellectual disabilities (ID). Aquatic exercise (AE) could be a viable option in this regard. Objective: To identify and critically analyze the best available evidence concerning the effects of AE in the physical and mental health of people with ID. Methods: A systematic review of randomized controlled trials (RCTs) and comparative studies was performed after searching within several databases up to March 2021. Results: A total of 4 RCTs and 3 comparative studies were found. Their methodological quality ranged from high to low. Aquatic interventions had positive effects on cardiorespiratory, muscular fitness and balance. Mixed effects were seen on parameters related to obesity and cognition. Scant information regarding feasibility and intervention fidelity was provided. In general, interventions details were not discussed in deep. Conclusion: Preliminary evidence shows that aquatic exercise can be prescribed to people with ID in order to improve their physical health. The impact of aquatic exercise on motor skills, cognitive function and mental health remains unclear. Further research on this topic should provide a detailed description of the interventions carried out, including information on the feasibility and intervention fidelity.

Considerations for the Design of a Physical Fitness Battery to Assess Adults with Intellectual Disabilities: Preliminary Reference Values for the SAMU DIS-FIT Study

For the assessment of the health-related physical fitness (PF) of individuals with intellectual disabilities (ID), tools designed for people without disabilities have generally been used. Also, the results of these assessments have routinely been compared with the scores obtained by people without ID. The objectives of the present study are to present the rationale for the design of an assessment battery for PF, the so-called SAMU DIS-FIT battery, and to present the results obtained by the participants classified according to age, sex, and level of PF (physical fitness). The selection criteria for the tests that would make up the battery were: (i) utility, (ii) psychometric properties, (iii) easiness and diversity, (iv) simplicity of execution, (v) familiarity and motivation, and (vi) economy of resources. A cross-sectional study was designed to assess the PF of 261 individuals with ID. To interpret the results obtained by the participants, each of the quantitative variables of PF was categorized into three levels: lower-fit, mid-fit, and higher-fit. The findings of this study serve as a first step in establishing PF baseline values for individuals with ID.

Questionnaires for the evaluation of the cervical and lumbar spine in Italian language: a systematic review of the structural and psychometric characteristics

INTRODUCTION

There has been an increase in the use of questionnaires as tools for the subjective evaluation of patients with neuro-musculoskeletal problems. The aim of this study was to analyze the psychometric properties of the questionnaires published in Italian for the evaluation of cervical and lumbar spine pain and related dysfunction.

EVIDENCE ACQUISITION

Two blinded bibliographical searches were carried out on seven databases, regarding back, lumbar and/or cervical musculoskeletal problems. Both the structural characteristics and the psychometric aspects of each of the questionnaires were extracted from each of the selected articles. The structural characteristics were: full name, acronym, author and date of adaptation to the Italian language, what it measures, number of items, time to complete, the result scale, where the points are located and the cost. The psychometric aspects were: standard error of measurement (SEM), minimum detectable change (MDC), minimal clinically important difference (MCID), test-retest reliability, internal consistency, criterion validity, construct validity and sensitivity to changes.

EVIDENCE SYNTHESIS

For the structural characteristics of the questionnaires identified for the valuation of the lumbar area, the number of items ranged between 10 and 24. Only two of the questionnaires presented specific categories, and the time to complete ranged between 5 and 7 minutes. The reliability of the questionnaires ranged between 0.869 and 0.961. None of the questionnaires calculated the inter-observer reliability. The internal consistency ranged between 0.82 and 0.90 for criterion validity. None of the questionnaires calculated sensitivity, SEM, MDC or MCID, with the exception of the Fear-Avoidance Beliefs Questionnaire, which showed a value of 12 on MDC. For the assessment of the cervical region, the number of items ranged from 6 to 20. Three of the questionnaires had sub-categories, and the time to complete them ranged between 2 and 5 minutes. The test-retest reliability ranged between 0.78 and 0.997. The internal consistency ranged between 0.842 and 0.942.

CONCLUSIONS

The Italian versions of the questionnaires present good basic structural and psychometric characteristics for the evaluation of patients with back, lumbar and/or cervical musculoskeletal disorders. The analysis of the structural and psychometric characteristics of these questionnaires is fundamental to identify the best tools to use in research and in clinical practice.