The metric or SI (Le SystÃ¨me International d'UnitÃ©s) system of units has many derived units from the seven base units. A derived unit would be a unit that is a combination of base units. Density would be an example where density = mass/volume or kg/m3. Many derived units have special names for the properties or measurements they represent. This table lists eighteen of these specialized units along with their basic unit factors.
Cadence (cycling) In cycling, cadence (or pedalling rate) is the number of revolutions of the crank per minute; this is the rate at which a cyclist is pedalling/turning the pedals. Cadence is directly proportional to wheel speed, but is a distinct measurement and changes with gearingâwhich determines the ratio of crank rpm to wheel rpm.
A man riding a recumbent bike. Photo Credit: Huntstock/DisabilityImages/Getty Images A recumbent bike is a cardiovascular machine that gives you a similar workout to a regular exercise bike. The difference is with the way the bike is set up. On a recumbent bike, there is a bucket seat with a backrest. The pedals are out in front of you, so when you operate the machine, you are in a horizontal position. This can take pressure off your lower back and prevent you from slouching. Even though the bike is a piece of aerobic equipment, there are multiple muscles that you will work when you use one. Video of the Day