Abstract
BackgroundDynamic knee extensor muscle strength is a valid measure among healthy older adults but has not been tested in the sarcopenia condition. This study’s objective was to test the validity of a one-repetition submaximal strength protocol to measure dynamic knee extension strength in older adults with and without sarcopenia.MethodsNinety-four physically independent older adults (female: n = 64, 60 to 85 years; male: n = 29, 60 to 85 years) participated in this study in Brazil during 2016–2017. Sarcopenia was classified and isokinetic unilateral knee extension strength was measured at 60°/s. Bilateral dynamic knee extension strength was estimated with an extensor chair using one-repetition submaximal protocol. Validity was determined using Spearman’s correlation with isokinetic muscle strength.ResultsThe frequency of sarcopenia was 11.7%. Sarcopenic individuals presented lower body mass, body mass index and skeletal muscle index. Only chronological age was higher among the sarcopenic individuals. A high correlation was found between isokinetic unilateral knee extension strength and bilateral estimated one-repetition with submaximal protocol (r = 0.74; p < 0.001), when the presence (r = 0.71; p = 0.014) and absence of sarcopenia (r = 0.74; p < 0.001) were considered. The validity of the one-repetition submaximal protocol for bilateral knee extension was confirmed.ConclusionsThe estimated measure of bilateral knee extension muscle strength can be used to monitor adaptations promoted by physical exercise for older adults with and without sarcopenia. The validation enable studies that will propose cutoff points to identify sarcopenia with this submaximal protocol. This will enable early diagnosis and better management of sarcopenia, a disease with adverse impacts for older adults.
Highlights
Dynamic knee extensor muscle strength is a valid measure among healthy older adults but has not been tested in the sarcopenia condition
Sarcopenia is a progressive and generalised skeletal muscle disorder, which is characterized by loss of muscle strength and muscle mass [1]
The main goal of this study was to validate of a onerepetition submaximal strength protocol to measure dynamic knee extension strength in older adults with and without sarcopenia
Summary
Dynamic knee extensor muscle strength is a valid measure among healthy older adults but has not been tested in the sarcopenia condition. This study’s objective was to test the validity of a one-repetition submaximal strength protocol to measure dynamic knee extension strength in older adults with and without sarcopenia. The number of older adults in the world is increasing exponentially and by 2050 there will be 1.5 billion [6]. At this time, low- and middle-income countries will be responsible for housing 1.2 billion [6]. Low- and middle-income countries will be responsible for housing 1.2 billion [6] This raises concerns for populous countries like China, India, Indonesia and Brazil. Actions are necessary to identify and prevent sarcopenia, a chronic public health problem with a considerable economic impact [5]
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