Continuing plyometrics?
If the athlete gradually improves his jump height, the same platform height is continued until increases in jump height are no longer observed. At this time takeoff height is increased by a few inches. If the athlete continually fails to jump very high, the height of the drop-down is lowered somewhat.[18] Most important here is how high the athlete jumps after the drop-down.
The maximum platform height used by a high level athlete is no more than 40 inches. Rather than developing greater explosive power this height leads to more eccentric strength development. Because of this, going higher than 30 inches is usually counterproductive and may lead to injury. This occurs when the intensity of the forced involuntary eccentric contraction upon landing is greater than the muscles can withstand. In addition, the athlete will not be able to execute a quick return (fast transition between muscular contractions) which is the key to successful execution of explosive plyometrics.
Because of the forces involved and the quickness of execution, the central nervous system is strongly involved.[19] Because of this, it is important that the athlete not overdo using the shock plyometric method. Doing so will lead to great fatigue and according to Verkhoshansky, sleep disturbances.[20] For example, athletes have great difficulty sleeping well if they execute too many depth jumps. This indicates that athletes must be well prepared physically before doing this type of training.[21]