BackgroundPeople with intellectual disabilities (ID) seem to have a lower physical fitness (PF) than their peers without disabilities which coincides with reduced autonomy, life expectancy and quality of life. To assess PF in these individuals, it is necessary to use appropriate tools that permit the assessment of their physical capacities taking into account their specific characteristics. The aim of this work is to study the feasibility and reliability of the Alpha-Fit test battery for adults in a group of men and women with mild to moderate ID. MethodForty-one adults with ID of both sexes, ranging in age from 20 to 60 years old, participated in the study. To identify the feasibility and reliability of the Alpha-Fit test battery for adults, two complete assessments were done for each one of the tests included in the battery. The assessments were performed for a period of no more than two weeks (test-retest). An intraclass correlation coefficient (ICC) was used to determinate test-retest reliability, and a mixed ANOVA factorial was used for each of the dependent variables. Bland-Altman plots were also used to assess consistency between the two measurements. Feasibility was calculated as the percentage of people who were able to perform the tests correctly (not feasible <50%, fairly feasible 50%-75%, and feasible >75%).In order to determine other psychometric properties, minimal detectable change (MDC) and standard error of measurement (SEM) were also calculated. ResultsOf the 10 tests in the Alpha-Fit test battery, 8 were shown to be feasible. High reliability was obtained (> .90) for the variables related to body composition. In the hand-grip test, reliability was high in the men's group, but low in the women's group. Good reliability results were also found (.80-.89) in the dynamic sit-up test for women, but not for men. Fair reliability (.70-.79) was found in jump-and-reach and neck-shoulder mobility tests. The variables in the 2km walk and agility tests indicated poor reliability. Al tests showed SEM values related to high variability. However, Bland-Altman plots showed results related to lack of consistency. ConclusionsThe feasibility and reliability calculations, as well as the SEM values, confirm that not all the tests of the Alpha-Fit Test Battery for Adults are suitable for the assessment of PF in adults with ID, probably because of the complexity of the motor fitness tests. The authors emphasise the necessity of making adaptations to the protocols used, or of using other tests more appropriate to the characteristics of people with mild to moderate ID.

Introducción: Las personas con discapacidad intelectual (DI) muestran, en general, menores niveles de condición física (CF) que las personas sin discapacidad. Sin embargo, la mayoría de test utilizados para su valoración han sido diseñados para población normalizada y no muestran su conveniencia para ser utilizados con personas con DI. Entre las capacidades condicionales una de las que habitualmente es valorada es la amplitud de movimiento (ADM). El objetivo de esta investigación fue conocer la idoneidad de dos test de evaluación de la ADM a través de la valoración de sus propiedades psicométricas en personas con DI leve-moderada. Los test seleccionados fueron el sit and reach (SAR) y el deep trunk flexion (DTF). Método: Se llevó a cabo el estudio con un diseño test-retest, en el que participaron 60 personas con DI: se distribuyeron aleatoriamente 15 mujeres (37.07±11.60 años) y 15 hombres (37.47±11.62) para valorar el DTF y 15 mujeres (36.87±11.72) y 15 hombres (36.40±8.57) para el SAR. Para conocer la idoneidad de ambos test, se calculó la fiabilidad, la viabilidad, el error estándar de la medida (EEM) y el mínimo cambio detectable (MCD). Resultados: La fiabilidad del DTF y del SAR fue buena-alta. Sin embargo, los gráficos de Bland-Altman mostraron sesgos para el SAR. La viabilidad del SAR fue baja, con menos del 50% de los participantes realizando la prueba correctamente. El EEM y el MCD mostraron mayor variabilidad de puntuaciones del SAR respecto al DTF. Conclusiones: el DTF se ha mostrado como el más recomendable de los dos test para la valoración de la ADM en personas con DI. Sin embargo, futuras investigaciones deben orientarse a la creación de test específicos diseñados para personas con DI.  Abstract. Introduction: People with intellectual disabilities (ID) show, in general, lower levels of physical fitness (PF) than people without disabilities. However, most of the test used for their assessment have been designed for the general population and do not show their suitability to be used with people with ID. Among the conditional capabilities, one of the most commonly assessed is the range of motion (ROM). The aim of this research was to assess the psychometric properties of the deep trunk flexion (DTF) and the sit and reach test (SAR) in people with mild-moderate ID in order to find out whether they are suitable for assessing this population. Method: The study was carried out with a test-retest design, in which 60 people with ID participated: 15 women (37.07±11.60 years) and 15 men (37.47±11.62) were randomly distributed to assess the DTF, and 15 women (36.87±11.72) and 15 men (36.40±8.57) were randomly distributed to assess the SAR. Reliability, feasibility, standard error of measurement (EEM) and minimum detectable change (MDC) were calculated to determine the suitability of both tests. Results: The reliability of the DTF and SAR was good to high. However, Bland-Altman plots showed biases for the SAR. The feasibility of the SAR was low, with less than 50% of participants performing the test correctly. The EEM and the MDC also showed higher variability for SAR with respect to the DTF. Conclusions: The DTF has been shown to be the more suitable of the two tests for the assessment of ROM in people with ID. However, future research should be oriented towards the creation of specific test for people with ID.