Premature ventricular contractions can occur in a healthy person of any age, but are more prevalent in the elderly and in men. They frequently occur spontaneously with no known cause. Heart rate turbulence (HRT) is a phenomenon representing the return to equilibrium of the heart rate after a PVC.
Microcycle is the training work unit that can be various on lasting, structure and contents. In praxa microcycles last 2-14 days, but the most often variant is 7 days.ecause of that it can be told that there is no unique, universal microcycle structure that can be thought to be equally good for each possible cases. In the theory of sports training there is multiple microcycles classifications.
A trampoline is a device consisting of a piece of taut, strong fabric stretched between a steel frame using many coiled springs. People bounce on trampolines for recreational and competitive purposes. The fabric that users bounce on is not elastic itself; the elasticity is provided by the springs that connect it to the frame, which store potential energy.