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Calculate the growth spurt and peak at the right time.
Calculate growth spurt
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Note: This data is not stored. Always take the child’s social safety into account when calculating the growth spurt. Inform and collaborate with the involved parents/guardians, and never store data without consent.
Need help? Check out the frequent asked questions (FAQ)
This line represents the growth curve and schematically indicates the average growth rate in centimeters per year.
P1
P1 (puberty phase 1) is the period before the start of the growth spurt, approximately 1 to 2.5 years, and is also referred to as the 'preparatory phase' in the ASM.
This marks the start of the growth spurt. On average, this occurs 1 year before the peak of the growth spurt for both boys and girls.
P2
P2 (puberty phase 2) is the period from the start of the growth spurt until a few months after the peak (PHV) and is also referred to as the 'acceleration phase' in the ASM.
The peak of the growth spurt (PHV; Peak Height Velocity) is the time of the most rapid height growth. For girls, this is on average around age 12, and for boys around age 14.
P3
P3 (puberty phase 3) is the final growth phase and is also referred to as the 'stabilization phase' in the ASM.
Peak at the right time.
The ASM Growth Calculation provides an estimate of where the child is in their physical development and measures biological age.
Chronological age is often used when forming groups and setting boundaries and expectations during development. However, children, especially around the growth spurt, develop individually at different paces. Each child therefore has their own ‘biological age’ during the growth spurt.
The result of the ASM Growth Calculation indicates when the child has reached or will reach their peak growth rate and in which growth phase (P1, P2, or P3) they currently are. In the Athletic Skills Model, the biological developmental age largely determines what is trainable or less trainable.
Calculation example
A girl aged 9.8 years* (chronological age) has a PHV value of -1.5 years at the time of measurement. This means she is one and a half years before the peak of her growth spurt. The girl’s current biological age is therefore 10.5 years. The estimated age at which she will reach the peak of her growth spurt is 11.3 years.
*Note: 0.8 is not 8 months, but 0.8 years. 12 * 0.8 = 9.6 months.
Need help?
FAQ
Seated height is the distance from the sitting surface to the top of the head. When measuring, ensure the child is sitting upright against a wall or measuring rod.
The ASM Growth Calculation is based on the scientific studies of Mirwald et al. (2002) and is most reliable for girls between the ages of 9 and 13 and boys between the ages of 12 and 16.
The ASM Growth Calculation is intended for professionals as part of an objective monitoring of physical development. Ultimately, the ‘eye of the expert’ determines what is best to train and which phase the child best fits in. In case of doubt or growth-related issues, always consult a local physiotherapist.
All children go through the growth spurt at different times and in different ways. One child may go through the growth phases earlier than average, while another may go through them later. Within the ASM, we refer to a child as an early bloomer if the peak of the growth spurt is more than a year earlier than average, and a late bloomer if it is more than a year later.
In the Athletic Skills Model, the growth spurt is divided into three growth phases: the puberty phases. These phases differ for boys and girls.
P1: The preparatory phase
P2: The acceleration phase
P3: The stabilization phase
Contact a professional with knowledge of the growth spurt and the Athletic Skills Model for targeted advice during the growth spurt.
PHV stands for Peak Height Velocity and is the moment during the growth spurt when the most height growth occurs (in cm per year). The result of the ASM Growth Calculation indicates when the child has reached or will reach their peak growth rate and in which growth phase (P1, P2, or P3) they currently are. In the Athletic Skills Model, the biological developmental age largely determines what is trainable or less trainable.
Want to learn more?
Do you want to know how to ensure optimal training load during the growth spurt and prevent injuries? Check out the courses offered by the ASM Academy.
ASM Academy
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