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The chain gang. In gridiron football, the chain crew (commonly known as the "chain gang") is a crew that manages signal poles on one of the sidelines.There are three primary signal poles: the "rear rod" that marks the beginning of the current set of downs, the "forward rod" that marks the line to gain, and the "box" that marks the line of scrimmage.
Collegiate and professional football games are 1 hour long, divided into four quarters of 15 minutes each. In high school football, 12-minute quarters are usually played. However, the game clock is stopped frequently, and a typical college or professional game can exceed three total hours.
Fractional flow reserve (FFR) is a diagnostic technique used in coronary catheterization. FFR measures pressure differences across a coronary artery stenosis (narrowing, usually due to atherosclerosis ) to determine the likelihood that the stenosis impedes oxygen delivery to the heart muscle ( myocardial ischemia ).
Missouri football is in the midst of what's shaping up to be one of its most successful seasons in recent memory. The No. 16 Tigers (7-1, 3-1 SEC) are second in the SEC East standings behind No. 1 ...
With the Kansas City Chiefs set to play for their third straight championship, the state of NFL officiating is under the microscope ahead of Sunday's Super Bowl. So much so that commissioner Roger ...
Following a controversial spot of the football in last Sunday's AFC championship game that many felt cost the Buffalo Bills a possible victory over the Kansas City Chiefs, renewed support for ...
In American football, a play is a close-to-the-ground plan of action or strategy used to move the ball down the field. A play begins at either the snap from the center or at kickoff. Most commonly, plays occur at the snap during a down. These plays range from basic to very intricate. Football players keep a record of these plays in a playbook. [1]
In American football, only one offensive player can be in motion at a time, cannot be moving toward the line of scrimmage at the snap, and may not be a player who is on the line of scrimmage. In Canadian football, more than one back can be in motion, and may move in any direction as long as they are behind the line of scrimmage at the snap.