An athlete's development phase in the USSA Training Systems can be determined by taking regular accurate and relatively simple measurements. Phases 3-6 are based on the rate of growth of an athlete, not just their age. If the athlete is before their growth spurt they are in phase 3, in their growth spurt they are in phase 4, or after their growth spurt in phase 5. Phase 6 is a fully mature athlete.
The adolescent growth spurt initially starts in the extremities. By monitorng standing height and sitting height together, one can detect the onset of the growth spurt. When an increase in the rate of growth in standing height occurs without an increase in growth rate of sitting height, it is a signal that the athlete has entered into the growth spurt, or phase 4 in the USSA Training Systems. It is important that these measurements are taken accurately and regularly (every three months during the age range around the growth spurt). Check back soon for proper measurement protocols and more information.
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