UMass Amherst KIN 470 - Lab 4 - spinal cord reflexes (3 pages)

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Lab 4 - spinal cord reflexes



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Lab 4 - spinal cord reflexes

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Pages:
3
School:
University of Massachusetts Amherst
Course:
Kin 470 - Exercise Physiology

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Spinal cord reflexes KIN 460 Motor Control Lab Section 2 Lab 4 Spinal cord reflexes Monosynaptic stretch reflex lab The nervous system likes to keep tabs on the state of the body Reflexes provide the nervous system a way to protect the body i e withdrawal reflexes or to restore deviations from intended movements i e a slip of the foot on ice When a difference between the expected position or change in position of a joint occurs stretch reflexes mediate a restoration of the joint to its intended position by activating the muscle that is stretched to contract and increase its tension through a monosynaptic stretch reflex Reflexes provide a rapid error correction process which happens at a latency i e delay that is quicker than we can voluntarily respond This process is a powerful way for us to establish corrective mechanisms that allow the execution of complex coordinated actions like walking in otherwise dangerous conditions i e icy surface Lab objectives 1 To become familiar with anatomical and physiological elements of simple spinal reflexes 2 To examine properties of some simple neuromuscular reflexes commonly tested in physical diagnosis 3 To measure and compare latent periods and reaction times of extensor reflexes 4 To elicit an extensor reflex and compare contractile force vs stimulus strength 5 To make associations between stimulus intensity reflex latency and excitation magnitude Spinal Cord Reflexes Setup 1 Set up each workstation accordingly Make sure you have a EMG electrode lead set b Three disposable vinyl electrodes c Reflex Hammer Transducer 2 Next locate the middle belly of the rectus femoris and place the first electrode pad white negative two inches below this mark on the mid line from the ASIS to the knee mid patella Place the next electrode pad red positive 4 inches above the first pad 3 Plug the EMG lead set into Channel 2 and the Reflex Hammer into Channel 1 4 Select Lesson 20 Spinal Cord Reflexes and type in your name Calibration 1 Set the



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