Define Work
The product of force and the distance through which that force acts.
W=F*d
Define Power
Describes how much work is accomplished per unit of time.
P=W/t
Define percent grade
The amount of vertical rise per 100 units of belt travel
Define relative VO2
Expressing VO2 as a function of the body weight
Define net efficiency
The mathematical ratio of work output divided by the energy expended above rest
Define metric system
Used in most countries. The standard system of measurement for scientists (Mega, Kilo, Centi, Mili, Micro, Nano, Pico)
Define SI units
Uniform system of reporting scientific measurement (Kg, m, s, N, J, W, m
s, n
m)
Calculate the total amount of work performed in 5minutes of exercise on the cycle ergometer given; resistance of the fly wheel= 25N
cranking speed= 60rpm
distance traveled per revolution= 6 meters
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Compare total work and power output per minute for 10 minutes of treadmill exercise given the following;
treadmill grade= 10%
horizontal speed= 90m*min
weight= 70kg
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Briefly describe the procedure used to estimate energy expenditure using (a) direct calorimetry and (b) indirect calorimetry
a. the process of measuring a person's metabolic rate via the measurement of heat production
b. estimation of heat or energy production on the basis of oxygen consumption, carbon dioxide production, and nitrogen excretion
Compare the estimated energy expenditure during horizontal treadmill walking for the following;
a. treadmill speed= 50m*min-1
subjects weight= 62kg
b. treadmill speed= 100m*min-1
subjects weight= 75kg
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Calculate the estimated O2 cost of horizontal treadmill running for a 70kg subject at 150, 200, and 235 m*min-1
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Calculate the power output during 1 minute of cycle ergometer exercise given the following;
flywheel resistance= 3.0 kp
cranking speed= 50 rpm
distance traveled per revolution= 6m
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Calculate net efficiency given the following;
resting VO2= .3L*min-1
exercise VO2= 2.1L*min-1
work rate= 150w
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Compute the oxygen cost of cycling at work rates of 50, 75, 100, 125w for a 60kg person
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