MAXIMUM MUSCULAR POWER
(High-Speed Strength)

Equipment

• Boxes of varying heights—for example, 20 cm

(7.9 inches), 30 cm (11.8 inches), and 40 cm (15.7

inches)

• A commercial device able to measure contact

time—for example, a jump or contact mat (contact

mat systems calculate jump height using

flight time (37, 62, 122)

Personnel

• One tester/recorder

Procedure

1. Begin with the athlete standing on top of the

drop box with the contact mat placed at least

0.2 m in front of the box.

2. Instruct the athlete to place hands on hips,

to step forward off the box without stepping

down or jumping up, and, upon contact with

the ground, to jump as high as possible while

minimizing contact time as much as possible

(figure 13.4).

3. The takeoff and landing positions, as well as

jumping strategy, should be the same for each

trial.

4. From the measuring device, obtain the jump

height and contact times.

5. The best of three trials is recorded.

6. Calculate the reactive strength index as jump

height divided by contact time.

7. The procedure can be repeated from boxes of

varying heights to obtain a stretch tolerance

profile for the athlete.

Fitness Equipments
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Reactive Strength Index

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