Laboratory Report Essay Example | Topics and Well Written Essays - 500 words

Laboratory Report - Essay Example Question 4: In this example of the elbow flexion unloading response (i.e. the task performed during the laboratory), state the muscle from which the data from sheet 1 was recorded, and whether the weight was removed unexpectedly or was self-removed by the subject. What was the latency of the response Answer: The data from sheet 1 showed the elbow flexion unloading response of the biceps. The weight was self- removed as we observed the reduced EMG activity of the biceps, starting before the onset of the unloading. The latency time is about 50 milliseconds. Question 5: Based on evidence from the laboratory and/or the literature, explain the major reflex pathway that causes the reduction in agonist EMG in the unexpected unloading response. Include the series of neural events from just prior to the release of the weight until the end of the first agonist (biceps) response. Answer: Anticipation in the postural domain is an example of the ability of the CNS to predict the consequence of the mechanical effect of movement on posture and helps minimize a forthcoming disturbance. A classical example was provided by the pioneer work of Belenkiy et al. (1967). They showed that, during arm raising while standing, the prime mover activity in the biceps brachii was preceded by an activation of a leg muscle, the biceps femoris, starting 100 ms before the movement onset.