Desempenho fisico e respostas eletromiograficas dos musculos vasto lateral, vasto medial e reto femoral durante esforços intermitentes anaerobio em ciclistas

AUTOR(ES)
DATA DE PUBLICAÇÃO

2004

RESUMO

The purpose of the present study was to investigate the neuromuscular recruitment characteristics of Vastus Lateralis (VL), Vastus Medialis (VM), and Rectus Femoris (RF) during anaerobic intermittent effort in cyclists and the relationships between electromyographic signal of muscles and physical performance. Eight males cyclists (age 18-30 years) performed three Wingate Anaerobic Test (WAnT1, WAnT2, and WAnT3) on a cycle ergometer with two minutes of rest between each exercise bout. Relative mean power (RMP) and Root Mean Square amplitude (EMG-RMS) were recorded throughout the cycling. RMP decreased significantly between WAnT1 and WAnT3 by 27%. EMG-RMS decrease was slightly more pronounced for RF (13%) than VL and VM (6%). The different EMG-RMS fatigue patterns between the VL, VM, and RF may be explained by morphological, architecture, and biomechanical factors. The multiple regression analysis indicated that for performance the most prominent predictor was the VL. This variable alone explained 68%, 45%, and 60% of the variance in performance during WAnT1, WAnT2, and WAnT3, respectively. We concluded that EMG-RMS fatigue patterns were different between the VL, VM, and RF. MPO and EMG-RMS declined during high intensity exercise but not in the same proportion. Further investigation is required to measure both metabolite accumulation and changes in neural firing patterns during high intensity intermittent effort

ASSUNTO(S)

cyclists musculos aptidão fisica - testes ciclistas wingate test fadiga capacidade anaerobica eletromiografia electromyography

ACESSO AO ARTIGO

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