One place is the American Heart Association and the American College of Cardiology guidelines. There are conditions where most doctors agree that a pacemaker should be placed. These would be called a Class I condition. For a Class I condition, the device is clearly indicated no matter what.
Enquire about Football Pitch Maintenance. The grass should be maintained at between 25 & 30 mm in the playing season, using good quality cylinder mowers that provide an even and true cut.et out a set of catch cans at 90 degrees to your pass. The catch cans should be 0.5 m apart from the centreline of your pass and extend beyond the maximum throw of the spreader. Plastic take-away boxes make great catch cans but should be weighted down in windy conditions.
On artificial surfaces, the field of play should be coloured green, ultramarine blue or signal blue. It is permitted for the run-off portion of the pitch to be an alternative colour.