Indoor rower

An indoor rower, or rowing machine, is a machine used to simulate the action of watercraft rowing for the purpose of exercise or training for rowing. Indoor rowing has become established as a sport in its own right. The term also refers to a participant in this sport.

Modern indoor rowers are often known as ergometers (colloquially erg or ergo), an ergometer being a device which measures the amount of work performed. The indoor rower is calibrated to measure the amount of energy the rower is using through their use of the equipment.

Chabrias, an Athenian admiral of the 4th century BC, introduced the first rowing machines as supplemental military training devices. "To train inexperienced oarsmen, Chabrias built wooden rowing frames on shore where beginners could learn technique and timing before they went on board ship."

Early rowing machines are known to have existed from the mid-1800s, a US patent being issued to W.B. Curtis in 1872 for a particular hydraulic based damper design. Machines using linear pneumatic resistance were common around 1900—one of the most popular was the Narragansett hydraulic rower, manufactured in Rhode Island from around 1900–1960. However they did not simulate actual rowing very accurately nor measure power output.

In the 1950s and 1960s, coaches in many countries began using specially made rowing machines for training and improved power measurement. One original design incorporated a large, heavy, solid iron flywheel with a mechanical friction brake, developed by John Harrison of Leichhardt Rowing Club in Sydney, later to become a professor of mechanical engineering at the University of New South Wales. Harrison, a dual Australian champion beach sprinter who went on to row in the coxless four at the 1956 Melbourne Olympics, had been introduced to rowing after a chance meeting with one of the fathers of modern athletic physiological training and testing, and the coach of the Leichhardt Guinea Pigs, Professor Frank Cotton. Professor Cotton had produced a rudimentary friction-based machine for evaluating potential rowers by exhausting them, without any pretence of accurately measuring power output. Harrison realised the importance of using a small braking area with a non-absorbent braking material, combined with a large flywheel. The advantage of this design (produced by Ted Curtain Engineering, Curtain being a fellow Guinea Pig) was the virtual elimination of factors able to interfere with accurate results—for instance ambient humidity or temperature. The Harrison-Cotton machine represents the very first piece of equipment able to accurately quantify human power output; power calculation within an accuracy range as achieved by his machine of less than 1% remains an impressive result today. The friction brake was adjusted according to a rower's weight to give an accurate appraisal of boat-moving ability (drag on a boat is proportional to weight). Inferior copies of Harrison's machine were produced in several countries utilising a smaller flywheel and leather straps—unfortunately the leather straps were sensitive to humidity, and the relatively large braking area made results far less accurate than Harrison's machine. The weight correction factor tended to make them unpopular among rowers of the time. Harrison, arguably the father of modern athletic power evaluation, died in February 2012.

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