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Exercise Physiology 8th Edition by Edward Howley, Scott Powers
Edition 8ISBN: 978-0078022531Exercise Physiology 8th Edition by Edward Howley, Scott Powers
Edition 8ISBN: 978-0078022531 Exercise 1
Define the following terms:
a. work
b. power
c. percent grade
d. relative
e. net efficiency
f. metric system
g. SI units
a. work
b. power
c. percent grade
d. relative
e. net efficiency
f. metric system
g. SI units
Explanation
Verified
Verified
a.
Work is defined as the product of force and the extent of distance through which the force acts. It has dimensions of Newton-meters or joules. Work performed can be calculated from force multiplied with distance travelled.
b.
The term power defines how much work is accomplished per unit of time. The SI (system international) unit for power is watt (W). A watt is defined as 1 joule per second. Power is calculated by dividing work with time.
c.
The term "percent grade" defines the incline of the treadmill. It is the amount of vertical rise per 100 units of belt travel. The percent grade of a treadmill is calculated by multiplying the sin of the treadmill angle by 100.
d.
VO2 is the volume of oxygen consumed per minute (L/min). Relative VO2 is the volume of oxygen consumed in liters, with respect to the body weight. It has the dimensions of ml.kg -1.min -1.
e.
In terms of physiology, efficiency is the capacity to convert energy expenditure into work. Net efficiency is the ratio of work output divided by the energy expended, when a person is at work. Measurement of net efficiency is required since no machine is 100% efficient. Some amount of energy always dissipates as heat.
f.
Metric system is an internationally accepted decimal system of measurement. It contains the meter, the litre, and the gram as basic units of length, volume, and mass. The subdivisions and multiples of the basic units are expressed in the factors of 10, which are expressed using a prefix attached to the basic unit.
g.
SI units or System International units are standardized units of measurement used t o present research data. SI system is the modern form of metric system. It is based on metre-kilogram-second units system.
Work is defined as the product of force and the extent of distance through which the force acts. It has dimensions of Newton-meters or joules. Work performed can be calculated from force multiplied with distance travelled.
b.
The term power defines how much work is accomplished per unit of time. The SI (system international) unit for power is watt (W). A watt is defined as 1 joule per second. Power is calculated by dividing work with time.
c.
The term "percent grade" defines the incline of the treadmill. It is the amount of vertical rise per 100 units of belt travel. The percent grade of a treadmill is calculated by multiplying the sin of the treadmill angle by 100.
d.
VO2 is the volume of oxygen consumed per minute (L/min). Relative VO2 is the volume of oxygen consumed in liters, with respect to the body weight. It has the dimensions of ml.kg -1.min -1.
e.
In terms of physiology, efficiency is the capacity to convert energy expenditure into work. Net efficiency is the ratio of work output divided by the energy expended, when a person is at work. Measurement of net efficiency is required since no machine is 100% efficient. Some amount of energy always dissipates as heat.
f.
Metric system is an internationally accepted decimal system of measurement. It contains the meter, the litre, and the gram as basic units of length, volume, and mass. The subdivisions and multiples of the basic units are expressed in the factors of 10, which are expressed using a prefix attached to the basic unit.
g.
SI units or System International units are standardized units of measurement used t o present research data. SI system is the modern form of metric system. It is based on metre-kilogram-second units system.
Exercise Physiology 8th Edition by Edward Howley, Scott Powers
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