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Firstly, it was a cross-sectional study and involved a limited number of participants. Ultrasound image of the vastus lateralis VL. Older adults are less steady during submaximal isometric contractions with the knee extensor muscles. Effect of aging on human muscle architecture.

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Decline in isokinetic force with age. Two best quality images were selected and then averaged for further analysis. The statistical analysis was performed using SPSS Mechanical and morphological properties of human quadriceps femoris and triceps surae muscle-tendon unit in relation to aging and running. Hip fracture risk in older white men is associated with change in body weight from age 50 years to old age. Lower extremity stiffness. Effects of 20 days bed rest on muscle morphology.

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Subsequently, force signals were converted into torque values Nm. Lorena Nappa for her assistance with data collection. This is particularly relevant to females, who live longer, reach the threshold of dependence earlier and have lower physical capacities than males at all ages Larsson et al. Author information Article notes Copyright and License information Disclaimer. Mechanical and morphological properties of different muscle-tendon units in the lower extremity and running mechanics. There was a problem providing the content you requested Please contact us via our support center for more information and provide the reference number below.

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Description: Briefly, the RMS value from the antagonist muscle group was reported as a percentage of the RMS amplitude during its MVIC when acting as an agonist and used to express the level of antagonist co-activation during knee extension. Therefore, one factor to explain the age-related reduction in MS may be the loss of the sarcomeres in series due to the reduction of fibre length observed in older participants Narici and Maganaris Moreover, our results are comparable with the results of previous studies which have examined the age-related decline in maximal i. Assessment of musculo-articular and muscle stiffness in young and older men. Methods for estimating numbers of motor units in biceps-brachialis muscles and losses of motor units with aging. Table 2 Effects of age and sex on mechanical and neural factors.
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