Lecture 35 - Occupational and work physiology Flashcards Preview

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Flashcards in Lecture 35 - Occupational and work physiology Deck (20):
1

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

2

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

3

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

4

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)

5

What are the factors affecting measurements of work rate

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

task paramenters - scenario, worker proficiency, motivation

6

true or false

HR overestimates VO2 max:

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

true

measuring VO2max is better

7

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

8

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

9

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

10

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

safe manner

11

manula handling accounts for __% of work related injuries

35%

12

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

Psychophysical
- perceived acceptible limit

Physiological
= % max aerobic capacity

Biomechanical
-lumbosacral stress

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

13

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

23kg

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

14

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

15

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

heat-related illness

16

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

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

17

Hypothermia is a core body temp below ___

35 degrees

18

what is cold-induced vasodilation?

increased peripheral blood flow at the expense of core temp

avoids frostbite - a good protective mechanism

19

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

20

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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