Associação entre equilíbrio muscular de membros inferiores e economia de corrida em corredores bem treinados do sexo masculino

• Autor(a) principal: Silva, Wallace de Almeida [UNIFESP]
• Data de Publicação: 2017
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da UNIFESP
• Texto Completo: https://sucupira.capes.gov.br/sucupira/public/consultas/coleta/trabalhoConclusao/viewTrabalhoConclusao.jsf?popup=true&id_trabalho=5193672; https://repositorio.unifesp.br/handle/11600/50765
• topic: Muscular balance ratio; Running economy; Body composition; Strength; Equilíbrio muscular; Economia de corrida; Composição corporal; Força

Background: The aim of the present study was to verify if flexor and extensor muscles peak torque (PT), balance ratios of knee and hip muscles or body composition is associated with running economy (RE) evaluated in level or uphill running in well trained male runners. Methods: 24 male long distance runners (31.0±7.7 years old, 176.2±7.3 cm and 70.4±8.4 kg) participated in the study. Maximal oxygen uptake ( ̇O2máx), conventional and functional balance ratio, PT of hip and knee flexor and extensor muscles, total body mass, fat mass and fat free mass were evaluated. RE was evaluated through the variables: Oxygen cost (OC) and energy cost (EC). In two separated days, RE was evaluated at 11 and 14 km/h on level ground (1% level-grade) and in 10 and 12 km/h on uphill (3% level-grade). Isokinetic testing was performed at 60 and 180º/s for hip and at 60 and 240º/s for knee joint. Results: Functional balance ratio of the hip muscles presented a significant negative relationship (p<0.05) with EC at 12 km/h in uphill and at 14 km/h in level-grade running (r= -0.69 to -0.70, respectively), OC presented meaningful relationship with hip functional balance ratio only when evaluated at 14 km/h (r= -0.73). Conventional and functional balance ratio of knee joint presented no relevant correlations with EC and OC. EC and OC presented significant relationships with PT of knee and hip muscles, total body mass, fat mass and fat free mass (p<0.05). Conclusion: High hip functional balance ratio values are associated with better RE. On the other hand, high PT values, total body mass, fat mass or fat free mass values are associated with poor RE. Thus, eccentric strengthening of hip flexor muscles should be emphasized in training, aiming to increase the functional balance ratio in long distance male runners. However, muscle strength training shouldn´t aim to increase muscular hypertrofy, but should aim to improve neuromuscular recruitment, since the increase of total body mass and fat free mass are associated with poor RE.