Lecture 35 - Occupational and work physiology Flashcards Preview

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Flashcards in Lecture 35 - Occupational and work physiology Deck (20):

what is the primary focus of work and occupational physiology?

ensure workers are physically capable of achieving their daily tasks without undue fatigue or risk of injury


how do you match job demands with physical capability?

alter the job tasks to fit the worker population

selection the worker to perform the task

train the work force


what is the first step in developing physical tests for job performance?

define job tasks - talk to experts

separate based on physiological capacities

measure different markers


In a load Carriage (march with 40kg pack), what is an appropriate intensity and why?

55% VO2MAX

important to be able to complete sub-maximally as there may be battles along the way, need to have reserves for section attack (20-30 x10m bounds over 20 mins)


What are the factors affecting measurements of work rate

physical profile of the worker - VO2MAX, body mass, height

task paramenters - scenario, worker proficiency, motivation


true or false

HR overestimates VO2 max:

high thermal burden
static work
work by small muscle groups
prolonged work at high intensity


measuring VO2max is better


uphill incline will increase __ ___ and downhill incline increases _____ work

uphill incline will increase work rate and downhill incline increases eccentric work

even quite light hilly terrain will increase work rate by quite a bit


If you weigh less you're at a disadvantage of performing army tasks as...

the weight you carry will have more of an impact on you VO2MAX


Male vs. female:

females are initially disadvantaged due to ___ ______

The percentile required for females would be ___

for males ___

Male vs. female:

females are initially disadvantaged due to weighing less

The percentile required for females would be 90th

for males 60th


Employees must be capable of performing their job in a ___ manner

safe manner


manula handling accounts for __% of work related injuries



The recommended weight of lift takes into account with 3 factors of manual handling:

- perceived acceptible limit

= % max aerobic capacity

-lumbosacral stress

horizontal/vertical/distance/coupling/asymmetry/frequency multipliers


What is the the max weight suggested under optimal circumstances for the recommended weight of lift


But not always possible to alter the task - pack weight weight 30kg
- select individuals capable of performing the task safely


The problem:
-increased risk of injury if jon tasks are at maximal capacity
- biomechanical factors cannot be influenced
-psychophysical measures are self selected

whats the manual handling solution?

max lifting capacity is correlated with psychophyical measures

max lifting tests can be used to predict a 'safe'standard


High body fat % and inexerpeience are the greatest risk factors for...

heat-related illness


what is the effective ways of dealing with heat-related illness?

-sweating;faster onset, greater production
-increased BV
- lower resting core temp and lower rise during exercise


Hypothermia is a core body temp below ___

35 degrees


what is cold-induced vasodilation?

increased peripheral blood flow at the expense of core temp

avoids frostbite - a good protective mechanism


how is performance affected by the cold?

reflexes and movements slower and less precise

reduced force

dexterity decreases

3% increase in VO2 per 1kg of additional clothing


people exposed to cold over a long period of time will have what changes?

blunted shivering and vasocontriction

increased loss of core body temp

for workers this means:
improved dexterity, less uncomfortable, maintained performance - but no reduction in the risk of hypothermia

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