| Texto completo | |
| Autor(es): Mostrar menos - |
Lixandrao, Manoel E.
;
Bamman, Marcas
;
Vechin, Felipe C.
;
Conceicao, Miguel S.
;
Telles, Guilherme
;
Longobardi, Igor
;
Damas, Felipe
;
Lavin, Kaleen M.
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Drummer, Devin J.
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Mcadam, Jeremy S.
;
Dungan, Cory M.
;
Leitao, Alice E.
;
Riani Costa, Luiz A.
;
Aihara, Andre Y.
;
Libardi, Cleiton A.
;
Gualano, Bruno
;
Roschel, Hamilton
Número total de Autores: 17
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Journal of Applied Physiology; v. 136, n. 2, p. 9-pg., 2024-02-04. |
| Resumo | |
The magnitude of muscle hypertrophy in response to resistance training (RT) is highly variable between individuals (response heterogeneity). Manipulations in RT variables may modulate RT-related response heterogeneity; yet, this remains to be determined. Using a within-subject unilateral design, we aimed to investigate the effects of RT volume manipulation on whole muscle hypertrophy [quadriceps muscle cross-sectional area (qCSA)] among nonresponders and responders to a low RT dose (single-set). We also investigated the effects of RT volume manipulation on muscle strength in these responsiveness groups. Eighty-five older individuals [41M/44F, age = 68 +/- 4 yr; body mass index (BMI) = 26.4 +/- 3.7 kg/m(2)] had one leg randomly allocated to a single (1)-set and the contralateral leg allocated to four sets of unilateral knee-extension RT at 8-15 repetition maximum (RM) for 10-wk 2 days/wk. Pre- and postintervention, participants underwent magnetic resonance imaging (MRI) and unilateral knee-extension 1-RM strength testing. MRI typical error (2x TE = 3.27%) was used to classify individuals according to responsiveness patterns. n = 51 were classified as nonresponders (<= 2x TE) and n = 34 as responders (>2x TE) based on pre- to postintervention change qCSA following the single-set RT protocol. Nonresponders to single-set training showed a dose response, with significant time x set interactions for qCSA and 1-RM strength, indicating greater gains in response to the higher volume prescription (time x set: P < 0.05 for both outcomes). Responders improved qCSA (time: P < 0.001), with a tendency toward higher benefit from the four sets RT protocol (time x set: P = 0.08); on the other hand, 1-RM increased similarly irrespectively of RT volume prescription (time x set: P > 0.05). Our findings support the use of higher RT volume to mitigate nonresponsiveness among older adults. (AU) | |
| Processo FAPESP: | 18/15691-2 - Efeito do volume de treinamento de força sobre a variabilidade da hipertrofia muscular em idosos |
| Beneficiário: | Manoel Emílio Lixandrão |
| Modalidade de apoio: | Bolsas no Exterior - Estágio de Pesquisa - Doutorado |
| Processo FAPESP: | 16/22635-6 - Efeito do volume de treinamento de força sobre a variabilidade da hipertrofia muscular em idosos |
| Beneficiário: | Manoel Emílio Lixandrão |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |