2008
DOI: 10.1007/s00421-008-0845-0
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Long-term resistance training improves force and unloaded shortening velocity of single muscle fibres of elderly women

Abstract: Four elderly women (78 +/- 4.3 years) were resistance trained (RT) for one year and needle biopsies of the vastus lateralis muscle were taken pre- and post-RT. A training intensity of 60% one-repetition maximum (1RM) was adopted for the entire duration of the study. Following RT, significant gain in isometric force of the quadriceps muscles was observed and MHC isoform distribution of vastus lateralis muscle showed a very significant shift from MHC-1 and MHC-2X towards MHC-2A, i.e. a bi-directional shift. A la… Show more

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Cited by 30 publications
(30 citation statements)
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“…This finding is in agreement with those from previous studies in which lowvelocity PRT was employed (14,16,36,37,43), although a much longer PRT duration (52 wk) has been reported to increase sF o in both young (28) and older (29) women.…”
Section: Sex Dimorphicsupporting
confidence: 95%
“…This finding is in agreement with those from previous studies in which lowvelocity PRT was employed (14,16,36,37,43), although a much longer PRT duration (52 wk) has been reported to increase sF o in both young (28) and older (29) women.…”
Section: Sex Dimorphicsupporting
confidence: 95%
“…One potential reason behind these varying results is differences in physical activity among the populations studied (Figure 1), a factor that is difficult to control for and has commonly not been addressed. Physical activity in older adults is well-known to alter single fiber contractile properties (Trappe et al, 2000, 2001; D'Antona et al, 2003, 2007; Frontera et al, 2003; Parente et al, 2008; Harber et al, 2009; Toth et al, 2012), with higher levels of daily activity or specific exercise training regimens tending to reduce or eliminate age-related differences. Such adaptations are not, however, simply linear throughout the activity spectrum, as immobilization in older individuals has been found to increase velocity (D'Antona et al, 2003, 2007), suggesting that complete loss of weight-bearing activity is characterized by very different adaptations, in keeping with findings from animal studies (Reiser et al, 1987) and muscle unloading due to short duration spaceflight in humans (Widrick et al, 1999).…”
Section: Agingmentioning
confidence: 99%
“…Tais resultados podem ser explicados pelos ajustes cardiovasculares ao treinamento, como a redução da PA para uma mesma intensidade de exercício (15) . Essa diminuição da PA talvez esteja atrelada à melhora da eficiência no recrutamento das fibras musculares (16) , que possivelmente proporcionaria menor demanda sanguínea para a musculatura ativa durante o exercício, refletindo nas respostas da PA pós-exercício. Nesse sentido, exemplificam-se os resultados de Mediano et al (9) , que observaram queda da PA durante os 60 min de recuperação pós-exercício em hipertensos sem experiência prévia com os exercícios com pesos.…”
Section: Grupo Treinadas Grupo Não Treinadasunclassified