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- Age-related influence on reliability and learning effect in the assessment of lower limb strength using sit-to-stand tests: A cross-sectional studyPublication . Vilarinho, Rui; Montes, António Mesquita; Melo, Cristina; Mesquita Montes, AntónioDecreased muscle strength, especially in the muscles of lower limbs, is an important risk factor for early age‐related decline in physical function, morbidity, hospitalization, and mortality.1 This evidence should be a stimulus for healthcare professionals to include the assessment of muscular strength as a priority in the community due to its substantial value in predicting future health status.2 For this purpose, sit‐to‐stand tests represent one of the simple and valid options to quantify lower limb strength,3 and two of the most used are the 1‐min sit‐to‐stand (1MSTS)4 and the 5 times sit‐to‐stand (5TSTS).5 To standardize the use of 1MSTS and 5TSTS, it is important to explore whether a similar reliability and learning effect exist between adults and older adults in community settings. Since aging may cause a significant reduction in motor skill acquisition,6 it is important to carefully consider whether performances on these tests are the same for repeated measurement over time (test‐retest) and if a practice test is needed according to age. Another reason to establish the reliability and learning effect, before recommending the use of the sit‐to‐stand tests for adults and older adults, is because significantly different performances have been found between these populations.7,8 With this research, we aimed to determine the within‐day test‐ retest reliability and the learning effect of the 1MSTS and 5TSTS in adults (