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MEDN2001 Medical Physiology and Pharmacology

Question

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Task

Aim
To examine heart rate and blood pressure responses to static and dynamic exercise
 
Introduction
During exercise, the cardiovascular system performs a number of important functions:
(1) to increase blood flow and oxygen delivery to contracting skeletal and cardiac muscle
(2) to maintain mean arterial pressure (MAP), thereby ensuring adequate cerebral blood flow, and
(3) to minimize exercise-induced hyperthermia by transporting heat to the skin where it is used to evaporate sweat.
The cardiovascular centre controls cardiovascular function and is activated in concert with the motor cortical inputs contracting skeletal muscle. This central command is subject to feedback modification by baroreceptors, chemoreceptors, volume receptors and afferents within contracting skeletal muscle. The cardiovascular response to exercise is influenced by a number of factors including mode of exercise, exercise intensity and active muscle mass. Thus, the responses to different types of exercise can provide a lot of information about the health of the cardiovascular system.
 
Note
Students with a history of hypertension or a resting diastolic blood pressure of >90 mmHg are excluded from being subjects in this class
 
Part A: Static Exercise (the same volunteer has to do both parts!)
 
Getting Started – Baseline Assessment
Record resting heart rate – Palpitation (carotid or radial pulse) is fine
Measure blood pressure a number of times to establish resting values. Record resting blood pressure
Place a blood pressure cuff on the non-exercising arm (usually your non-dominant arm)
While seated, exert maximum force with the hand-grip dynamometer with your dominant hand.
The highest of three trials is to be recorded as the maximum voluntary contraction (MVC) Procedure: Test 1
 
Start and maintain a handgrip contraction of the hand-held dynamometer at 30% MVC for 3 minutes, breathing normally
Record heart rate and measure blood pressure each minute during exercise
At the end of 3 minutes contracting - Stop contracting
Record heart rate and measure blood pressure during 3 minutes of recovery
 
Part B: Dynamic Exercise (the same volunteer has to do both arm and leg exercises!)
Getting Started – Baseline Assessment
Place a blood pressure cuff on the arm for blood pressure
Record heart rate and measure blood pressure to establish resting (baseline) values
The subject then exercises for 12 minutes (4 minutes at 3 workloads) in 2 ways (these can be done in any order you like):
(a) leg exercise
the subject performs step ups at a rate of 1 every 3 seconds, 1 every 2 seconds and then 1 every second
(b) arm exercise
the subject will "bicep curl" (Both arms) light, medium and heavy loads
Record heart rate and measure blood pressure during the last 30 seconds of each workload
 
Note 1
As the subject will have to cease exercising for the blood pressure to be accurately taken, pump up the cuff just prior to the subject stopping so that you are ready to take the measurement as soon as the person stops exercising and ensure that you take no more than 30 seconds to measure blood pressure.
Graph heart rate and systolic, diastolic and mean arterial pressure against workload for the two modes of exercise.

MEDN2001 Medical Physiology and Pharmacology

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