Academic journal article Research Quarterly for Exercise and Sport

Reliability of Muscular Strength and Endurance Assessments for Individuals with Mental Retardation Using Generalizability Theory

Academic journal article Research Quarterly for Exercise and Sport

Reliability of Muscular Strength and Endurance Assessments for Individuals with Mental Retardation Using Generalizability Theory

Article excerpt

Muscular strength and endurance are important for individuals with mental retardation (MR) because they are integral parts of daily living and recreation skills. They also are more like to have employment opportunities that require physical labor. Although a few studies have focused on muscular strength, there is limited information on muscular endurance of individuals with MR. Lack of research may be related to the difficulty of accurately assessing muscular strength and endurance. Considering that large within-individual variability and lack of motivation are often observed in persons with MR, it is important to evaluate the appropriateness of assessing muscular strength and endurance in this population. Therefore, the purpose of this study was to examine the reliability of muscular strength and endurance assessments in adults with MR using Generalizability theory (G-theory). G-theory is a psychometric theory that not only estimates overall reliability but also evaluates possible sources of error. Nineteen individuals with MR participated in the study. Four separate testing sessions were conducted within a 4-week period. Muscular strength and endurance were measured with a hand-grip dynamometer by two raters. Each rater tested participants on two different days. For muscular strength, the participants were asked to squeeze the dynamometer as hard as they can three times during each testing session. …

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