Gyko system

The Gyko inertial sensor system (dimensions: 50 × 70 × 20 mm, mass: 35 g; Microgate, Bolzano, Italy) contains three-dimensional accelerometer, gyroscope, and magnetometer, which allows recordings (full scale range: 8 g) at a sampling frequency of 500 Hz (Fig. 2a-c). The Gyko system was perpendicularly attached to an elastic belt provided with the system. The Gyko system was fixed on the waist level on the back of the body, as indicated by the manufacturer (http://www.gyko.it/en). During assessment, accelerometer and gyroscope signals are transferred via blue tooth to a personal computer (Lenovo, model T 530) and stored using the proprietary software (GykoRePower Software). The software automatically calculated vertical jump height from the obtained flight time using the following formula: jump height = 1/8 × g × t ², where g is the acceleration due to gravity and t is the flight time [8].

The Gyko inertial sensor system (Microgate, Bolzano, Italy) presented beside a 2 Euro coin (a), attached to the proper Velcro elastic belt (b), and fixed on the waist level on the back of the body for acceleration recordings during squat jump (c)