The calculation estimates where the child is in his or her physical development. The calculation indicates when the child will reach the maximal growth rate (APHV; Age Peak Height Velocity) and in which ASM stage the child is located at that moment.
The biological developmental age determines for a large part what is trainable and what is less trainable in children. Stage P1 includes, for example, other training types, but also another balance between intensity and volume when compared to stage P2 or P3.
please note that:
The ASM Growth model serves as a framework, the ‘master’s eye’ determines ultimately what can be trained and who fits in which stage.
The period of accelerated growth (P2) is an important learning stage, in which steps should be taken to prevent children getting injured. Adapting to the ‘new proportions of the body’ should best be done during movement (sports).
The ASM Growth model is based on the scientific study of Mirwald et al. (2002) and is most reliable for girls in the age of 9-13 years and for boys in the age of 12-16 years.
We refer to the ASM book for more information about the exercises regarding the ASM Growth Model.
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The calculation estimates where the child is in his or her physical development. The calculation indicates when the child will reach the maximal growth rate (APHV; Age Peak Height Velocity) and in which ASM stage the child is located at that moment.
PHV is determined by simply measuring standing height at regular intervals (we suggest every 3-6 months). Once several measurements have been obtained, velocity curves (i.e. how fast a child is growing) can be charted. As shown in Figure 1 (above), complete height velocity can be charted and PHV can be observed.
Peak height velocity (PHV) is simply the period of time in which an adolescent experiences the fastest upward growth in their stature (i.e. the time when they grow the fastest during their adolescent growth).
Age PHV was calculated using the formula x-[y 2 / (y 1 +y 2 )], where x, y 1 , and y 2 are defined as the age at PHV, absolute value of the difference between PHV and HV at 1 yr before the age at PHV, and absolute value of the difference between PHV and HV at 1 yr after the age at PHV, respectively (Fig. 1).
To calculate the percentage growth rate, use the basic growth rate formula: subtract the original from the new value and divide the results by the original value. To turn that into a percent increase, multiply the results by 100.
Instantaneous growth rates are loga- rithmic and inherently difficult to interpret, but specific growth rates (SGR) express growth as the intuitively understandable per cent change in size per unit of time. A simple metric of SGR (G) is easily computed by exponentiating g, subtracting 1 and multiplying by 100.
Growth rates are computed by dividing the difference between the ending and starting values for the period being analyzed and dividing that by the starting value. Time periods used for growth rates are most often annually, quarterly, monthly, and weekly.
In general, healthy term infants and children grow about 2.5 cm/month between birth and 6 months, 1.3 cm/month from 7 to 12 months, and about 7.6 cm/year between 12 months and 10 years. Before 12 months of age, height velocity varies and is due in part to perinatal factors (eg, prematurity).
To calculate the peak height h r , the first step is to calculate the difference h d between the ball radius d b ∕2 and h r . This is performed using the Pythagorean theorem for the two same-sized right-angled triangles between both center points and the intersection of both spheres (Fig. ...
For example, you are 17 years old and your maturity offset is 2.5. You have to subtract that 2.5 from the age of 17, so that is 14.5. That means that you have had your Peak Height Velocity at the age of 14.5.
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”The maturity offset can be used to calculate a child's age of PHV, which is commonly used by strength and conditioning coaches and sports scientists to adapt their training prescription. Thus, understanding PHV and monitoring your athletes' maturity offset (age of PHV) is highly-encouraged.
Although children may have a few smaller secondary growth spurts, PHV usually occurs as a single event. This usually takes place few years earlier in girls (10-12 years old) than boys (12-14 years old). Peak growth can last anything from a few weeks to a few months.
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