- published: 09 Sep 2014
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Walking (also known as ambulation) is one of the main gaits of locomotion among legged animals, and is typically slower than running and other gaits. Walking is defined by an 'inverted pendulum' gait in which the body vaults over the stiff limb or limbs with each step. This applies regardless of the number of limbs - even arthropods with six, eight or more limbs.
The word walk is descended from the Old English wealcan "to roll". In humans and other bipeds, walking is generally distinguished from running in that only one foot at a time leaves contact with the ground and there is a period of double-support. In contrast, running begins when both feet are off the ground with each step. This distinction has the status of a formal requirement in competitive walking events. For quadrupedal species, there are numerous gaits which may be termed walking or running, and distinctions based upon the presence or absence of a suspended phase or the number of feet in contact any time do not yield mechanically correct classification. The most effective method to distinguish walking from running is to measure the height of a person's center of mass using motion capture or a force plate at midstance. During walking, the center of mass reaches a maximum height at midstance while during running, it is at a minimum. Definitions based on the percent of the stride during which a foot is in contact with the ground (averaged across all feet) of greater than 50% contact corresponds well with identification of 'inverted pendulum' mechanics and are indicative of walking for animals with any number of limbs, although this definition is incomplete. Running humans and animals may have contact periods greater than 50% of a gait cycle when rounding corners, running uphill or carrying loads.
Christopher John "Chris" Matthews (born December 17, 1945) is an American news anchor and political commentator known for his nightly hour-long talk show, Hardball with Chris Matthews, which is televised on the American cable television channel MSNBC. On weekends he hosts the syndicated NBC News–produced panel discussion program The Chris Matthews Show. Matthews makes frequent appearances on many other NBC and MSNBC programs. On March 22, 2009, Matthews renewed the contract for Hardball with Chris Matthews through 2012.
Matthews was born in Philadelphia, Pennsylvania, to Irish American parents and is a Roman Catholic. He attended La Salle College High School. He is a 1967 graduate of the College of the Holy Cross in Worcester, Massachusetts, and did graduate work in economics at the University of North Carolina at Chapel Hill.
Matthews served in the United States Peace Corps in Swaziland from 1968 to 1970 as a trade development adviser.
When Matthews first arrived in Washington, D.C., he worked as a police officer with the United States Capitol Police. Subsequently, he served on the staffs of four Democratic members of Congress, including Senators Frank Moss and Edmund Muskie. In 1974, he mounted an unsuccessful campaign for Pennsylvania's 4th congressional district seat in the U.S. House of Representatives in which he received about 24% of the vote in the primary. Matthews was a presidential speechwriter during the Carter administration and later worked for six years as a top aide to longtime Speaker of the House of Representatives Tip O'Neill, playing a direct role in many key political battles with the Reagan administration.
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