Testing protocol · Jumps
Countermovement jump (CMJ)
A vertical jump with a countermovement, in three attempts, recorded as direct height or as flight time. With direct height and the day's body mass, power is estimated with the Sayers equation.
Version 3 of the protocol in the StatsCenter catalogue.
Calculator
Jump power calculator: the Sayers equation
Enter the jump height and the day's body mass. Peak power comes from the Sayers equation; relative power divides it by body mass.
The formula
Estimated peak power = 60.7 × jump height (cm) + 45.3 × body mass (kg) − 2055
Estimated relative peak power = peak power ÷ body mass (kg)
Sayers, Harackiewicz, Harman, Frykman & Rosenstein (1999), Medicine & Science in Sports & Exercise 31(4):572-577. The equation estimates; it is not a clinical report and does not replace a direct measurement. It is the same calculation StatsCenter applies when a club collects.
Result
When collecting
What StatsCenter records and calculates.
Read from the product's protocol catalogue, in the version a club uses today when it creates an assessment.
Measures
- Jump height
- cm · the highest attempt counts
- Body mass
- kg · recorded as measured · one reading per athlete on the day · optional
- Flight time
- ms · the highest attempt counts · in flight time mode
Collection conditions
- Measurement method
- Listed: direct measurement and self-reported; another can be described. Must match for two collections to be compared.
- Instrument
- Listed: contact mat, force plate, app (MyJump) and no technology; another can be described. Must match for two collections to be compared.
Derived values
Estimated peak power
W- Equation
- 60.7 × jump height (cm) + 45.3 × body mass (kg) − 2055
- Fitted on
- Squat jump (SJ); with CMJ data it overestimates by 2.7% on average
Sayers equation for peak power in the vertical jump. Sayers, Harackiewicz, Harman, Frykman & Rosenstein (1999), Medicine & Science in Sports & Exercise 31(4):572-577. Source
Estimated relative peak power
W/kg- Equation
- 60.7 × jump height (cm) + 45.3 × body mass (kg) − 2055
- Fitted on
- Squat jump (SJ); with CMJ data it overestimates by 2.7% on average
- Relative
- peak power ÷ body mass (kg)
Sayers equation for peak power in the vertical jump. Sayers, Harackiewicz, Harman, Frykman & Rosenstein (1999), Medicine & Science in Sports & Exercise 31(4):572-577. Source
Height estimated from flight time
cmin flight time mode
- Gravity, in m/s²
- 9.80665
- Equation
- g × t² ÷ 8
Jump height from flight time. Bosco, Luhtanen & Komi (1983), Eur J Appl Physiol 50:273–282. Source
Other protocols
Who uses it at the club
Collect your squad's CMJ in StatsCenter.
The protocol comes ready, with its attempts, its formulas and every athlete's history.
No card needed, every module included. Sign-up and the product are in Portuguese.