Purpose: To estimate the within-day test-retest reliability and standard error of measurement (SEM) of the unsupported upper limb exercise test (UULEX) in adults without disabilities and to determine the effects of age and gender on performance of the UULEX.
Method:A cross-sectional study was conducted with 100 adults without disabilities (44 men, mean age 44.2 [SD 26] y; 56 women, mean age 38.1 [SD 24.1] y). Participants performed three UULEX tests to establish within-day reliability, measured using an intra-class correlation coefficient (ICC) model 2 (two-way random effects) with a single rater (ICC [2,1]) and SEM. The effects of age and gender were examined using two-factor mixed-design analysis of variance (ANOVA) and one-way repeated-measures ANOVA. For analysis purposes, four sub-groups were created: younger adults, older adults, men, and women. Results: Excellent within-day reliability and a small SEM were found in the four sub-groups (younger adults The within-day test-retest reliability and SEM values of the UULEX may be used to define the magnitude of the error obtained with repeated measures. One UULEX test seems to be adequate for younger adults to achieve reliable results, whereas three tests seem to be needed for older adults.:Key Words: outcome assessment; standard error of measurement; UULEX; within-day reliability. Nevertheless, arm ergometers are expensive and require trained health professionals to conduct and interpret the tests; thus, their use is somewhat limited in community exercise programmes.The unsupported upper limb exercise test (UULEX) is a symptom-limited, incremental test first described by Takahashi and colleagues 14 to assess upper limb peak exercise capacity in patients with chronic obstructive pulmonary disease (COPD). UULEX test-retest reliability has been studied in patients with COPD, and it has shown excellent ICCs for UULEX total exercise time (ICC = 0.98), with no significant differences among tests conducted within 2-4 days. 14 The UULEX's excellent reliability results, along with its higher portability, ease of implementation, and low cost, make it a promising measure for use in community exercise programmes with people without disabilities.Nevertheless, evidence shows that the measurement properties of a given test are specific to a particular population. 15 Thus, before recommending use of the UULEX with people without disabilities, its reliability -namely, its within-day test-retest and standard error of measurement (SEM) -should be established for younger and older people without disabilities, as well as for men and women, because significantly different performances on endurance tests have been found with these populations. 16,17 SEM values will inform health and sports professionals about the minimum number of tests needed to achieve a reliable baseline measure. This information will enhance the assessment of upper limb peak exercise capacity in people without disabilities and the development of exercise programmes for this population.As a result, this st...