The effects of respiratory muscle training on respiratory mechanics and energy cost.
Respir Physiol Neurobiol
; 200: 7-17, 2014 Aug 15.
Article
em En
| MEDLINE
| ID: mdl-24816143
ABSTRACT
Resistance respiratory muscle training (RRMT) increases respiratory muscle strength and can increase swimming endurance time by as much as 85%. The purpose of this study was to examine potential mechanisms by which RRMT improves exercise endurance. Eight healthy adult male scuba divers underwent experiments in a hyperbaric chamber at sea level (1 atmosphere absolute (ATA)), 2.7 ATA and 4.6 ATA, both dry and fully submersed. Subjects rested, exercised, and rested while mimicking their own exercise breathing (ISEV). Airway resistance (R(aw)), exhaled nitric oxide output (VË(NO)), and respiratory duty cycle (T(I)/T(Tot)) were determined before and after four weeks of RRMT. RRMT decreased T(I)/T(Tot) (-10% at rest at 1 ATA), VË(O2) (-17% at 2.7 ATA during submersed exercise), VË(E) (-6% at 2.7 ATA during submersed exercise), and R(aw) (-34% inspiratory at 4.6 ATA submersed, -38% expiratory at 2.7 ATA dry), independent of changes in VË(NO). Most importantly, respiratory muscle efficiency increased (+83% at 2.7 ATA submersed).
Palavras-chave
Texto completo:
1
Temas:
ECOS
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Financiamentos_gastos
Bases de dados:
MEDLINE
Assunto principal:
Músculos Respiratórios
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Exercícios Respiratórios
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Mecânica Respiratória
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Mergulho
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Esforço Físico
Tipo de estudo:
Health_economic_evaluation
Limite:
Adult
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Humans
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Male
Idioma:
En
Revista:
Respir Physiol Neurobiol
Ano de publicação:
2014
Tipo de documento:
Article