Muscle Recruitment Between Increasing Force Output

COMPARISON OF MUSCLE RECRUITMENT BETWEEN INCREASING lead OUTPUT, CONCENTRIC AND ECCENTRIC CONTRACTIONS, AND MUSCLE FATIGUE INTRODUCTION: forcefulness end product by skeletal vim occurs when put through potentials signal muscularity fibers to contract. Motor neurons are a specific instance of neuron involved in goodly contraction. These neurons transmit galvanizing signals that understanding a certain number of push building blocks to fire. The point of this testing ground was to ascertain the relationship between force back unit natural action under increasing loads. Also, to compare activeness between homocentric and reference contractions as well as the effects of muscular fatigue on motor unit recruitment. METHODS: Two males and 2 females, between 18 and 25 days old, were assessed using BioPac electromyography (electromyogram). Subjects upraised increasingly heavier weights at 3, 5, and 10 pounds. The electromyogram activity was enter for the bicep s brachii for each person on both(prenominal) the coaxial and outlandish somas of the bicep curl. Subjects were instructed to perform the lift with approximately tetrad seconds in the concentrical phase and four seconds in the eccentric phase with a one second pause in between the concentric and eccentric phases.

To assess muscular fatigue, subjects were infallible to hold a 15 pound weight with their elbow at ninety degrees of flexion for approximately two minutes. electromyogram activity was save for the duration of the isometric hold. RESULTS: The average EMG area for the concentric phase of exercise was 0.4, 0.56, 1.12 mV/s at 3, 5, and 10 po! unds, respectively (see graphs). For the eccentric phase, the average was 0.24, 0.36, and 0.48 mV/s. Under muscle fatigue, EMG areas were taken at xx second intervals resulting in the following averages: 0.45, 0.57, 0.5, 0.66, 0.82, 0.78 mV/s. DISCUSSION: An individual exercising with progressively heavier loads appears to recruit more motor units as the request for force output is increased. Concentric phase EMG activity is markedly higher than...If you want to sop up a ample essay, order it on our website: OrderCustomPaper.com

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