Download presentation
Presentation is loading. Please wait.
1
INSY 3020 Work Physiology Dr. Robert E. Thomas Industrial & Systems Engineering Department Auburn University Spring 2005
3
ANTERIORPOSTERIOR
13
Systems Most Relevant To Work Physiology Muscular Cardiovascular Respiratory Nervous
14
Types of Muscle Tissue - Skeletal - Cardiac - Smooth
17
Muscle System Functions Movement / Posture Circulation Blood Pressure Food Movement Heat Production Breathing Expelling of Waste Products
18
Skeletal Muscle Motor Units “ The functional unit of neuro- muscular control of movement. It consists of an anterior motor neuron in the spinal cord, the nerve fibers that innervate muscle cells, and junctions between the nerve and muscle cells.”
22
Physiology vs. Work Physiology Physiology The study of the functions of the body parts. ie. How the body parts work.
23
Physiology Vs.. Work Physiology (cont’d) Exercise / Work Physiology The study, description, evaluation, and explanation of the physiological changes in the human body resulting from either a single or repeated series of exposure to work stresses.
24
Exercise Physiology vs. Work Physiology (cont’d) Primary differences are in the target populations and in some assumptions about where and how they are working.
25
Exercise Physiology Goal: Maximize the physiological efficiency of the target population. Target Population: Fit, healthy, young, and motivated. Environment: Usually optimum or controlled.
26
Work Physiology Goal: To ensure worker can perform task efficiently and safely within the environment. Target Population: All kinds of people. Environment: Usually not optimal or controlled (noise, heat, etc.)
27
How Do We USE Work Physiology? To enhance EFFICIENCY – To monitor energy expenditure and avoid excess fatigue To ensure SAFETY - do not push people beyond their physical limitations.
28
Example Uses of Work Physiology Can the job be safely accomplished by people---- for the required duration using prescribed tools and methods. Which methods are easier? Can a specific individual perform a job safely? How should jobs be ranked (for compensation & work-rest cycle purposes)?
29
EFFICIENCY
34
Heart Rate Measurements Palpation Electronics Light Sound Reference Konz, pg. 123
38
Effects of Aging Decline starts at about 30 years Progressive loss of muscle mass Lost muscle tissue replaced by fat Decrease in maximal strength Diminishing of muscle reflexes
40
Fatigue Two general types: Central... Nerve related Peripheral... Muscle related
41
Efficiency Lesson Use heart rate to evaluate energy usage Design work for light to moderate energy expenditure
42
SAFETY
43
Heart Rate Max HR (Beats/Min)= 220-Age (In Years) Criteria: Rest: 65-85 BPM Not Consistently Above (Moderately Heavy Work): 120- 150BPM
44
Work –Rest Cycles
45
Work-Rest Cycles
46
AIHA CRITERIA For Work Rest Cycles
47
Summary Ergonomics uses physiological responses to address both efficiency and safety issues Responses of the respiratory and cardiovascular systems are are most accessible Oxygen uptake and Heart Rate are the most frequently used measures…..but particularly heart rate Work -Rest Cycles are used to practically achieve efficiency and safety goals when work varied and includes is moderate to heavy components
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.