![]() ![]() You will quickly see their rotational bias. I stand about ten meters back and tell them that when they hear the clap of my hands, they are to stand up, turn and run toward me as fast as they can. I have my athletes kneel on both knees facing away from me. These are usually the great defensive backs in football. Others can easily rotate right or left without betraying a bias or appearing awkward. Some are what researchers refer to as cross dominant. How might a coach determine these kinds of rotational tendencies? We can’t always just assume right-handers will go right, and left-handers left. In other words, forcing an athlete to move in the opposite direction of his or her rotational tendency or bias puts that player at a disadvantage. “It is not surprising that left-handers, always forced in the direction away from natural counter-clockwise running tendencies, are more apt to make mistakes or to be slower or less graceful in their body movements.” For example, when asked to turn around on the spot, right-handers have a natural tendency to rotate their bodies to the right, resulting in a clockwise pirouette, while left-handers rotate more naturally to the left, resulting in a counterclockwise turn.”Ĭoren offers the following analysis, which is important for those of us who coach athletes in multi-directional sports. “Other more formal studies have confirmed that left and right handers have different turning tendencies. Stanley Coren notes that the vast majority of right-handers like to turn right while the majority of left-handers prefer to turn left. For example, why is it so difficult for football coaches to move a player from the right side of the line to the left-or vice-versa? Why do some defensive backs break better inside or outside on the ball? Figure 2: The cover of The Left-hander Syndrome by Stanley Coren We see these kinds of biases at all levels of sport. This left drifting may be basic to our human nature, and running counter-clockwise instinctual.īut does this theory make sense relative to what we know about movement choice in right or left dominant athletes?Īll of us reveal what is often referred to as a veering tendency, or what I like to call a “rotational bias.” For multi-directional sports, determining an athlete’s rotational bias can give an opposing player an advantage. These factors influence right leg dominance, which leads to a tendency to turn to the left. We also have a slightly longer right leg than left leg. One theory is that the majority of people are right-handed, which means they are often right-footed. Track coaches working with developmental sprinters in Junior Olympics note this same drifting to the left, often to the consternation of LYNX timing operators who end up with two athletes in the same lane even though they didn’t start that way. ![]() He noted a tendency in most of us when blindfolded to begin walking a little bit to the left. It was Professor Hiroshi Watanabe from SOKA University in California who came up with an answer while researching whether winding stairs should be designed clockwise or counter-clockwise. For twenty-five years, we always turned left. For my cross country team, we run a 1.5 mile crushed limestone loop in an area forest preserve. What we know is that almost all joggers, if given a choice of direction, choose circular routes that run counter-clockwise. Ask people to think of activities that require a left rotation, and they will usually come up with things like Roller Derby, indoor bicycle racing, baseball running, speed skating, merry-go-rounds, revolving doors, and even Hula Hoops.īut is there something unique to track that suggests left is best? We call this movement counter-clockwise. The question may well be related to why we turn left in a lot of activities. Undefined, and hence non-deterministic.) Parameters: ring - an array of Coordinates forming a ring (with first and last point identical) Returns: true if the ring is oriented counter-clockwise.I often tell my athletes that track running is a lot like NASCAR-run fast, turn left, repeat as necessary. ![]() (Note that the orientation of rings with zero area is essentially However, this approach may be less accurate in the case of This provides a more useful result in some situations, such as buffering. The largest enclosed area (including overlaps). The algorithm determines the orientation of ![]() This algorithm is guaranteed to work with valid rings.įor invalid rings (containing self-intersections), This handles rings which are invalid due to self-intersection.(in particular, along the top of the ring). This handles rings which contain collapsed segments.This handles coordinate lists which contain repeated points.The list of points is assumed to have the first and last points equal.Oriented counter-clockwise, using the signed area of the ring. Tests if a ring defined by an array of Coordinates is ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |