Validity and Reliability of the Myotest Accelerometric System for the Assessment of Vertical Jump Height

Abstract

The aim of the present study was to verify the validity and reliability of the Myotest accelerometric system (Myotest SA, Sion, Switzerland) for the assessment of vertical jump height. Forty-four male basketball players (age range: 9-25 years) performed series of squat, countermovement and repeated jumps during 2 identical test sessions separated by 2-15 days. Flight height was simultaneously quantified with the Myotest system and validated photoelectric cells (Optojump). Two calculation methods were used to estimate the jump height from Myotest recordings: flight time (Myotest-T) and vertical takeoff velocity (Myotest-V). Concurrent validity was investigated comparing Myotest-T and Myotest-V to the criterion method (Optojump), and test-retest reliability was also examined. As regards validity, Myotest-T overestimated jumping height compared to Optojump (p < 0.001) with a systematic bias of approximately 7 cm, even though random errors were low (2.7 cm) and intraclass correlation coefficients (ICCs) where high (>0.98), that is, excellent validity. Myotest-V overestimated jumping height compared to Optojump (p < 0.001), with high random errors (>12 cm), high limits of agreement ratios (>36%), and low ICCs (<0.75), that is, poor validity. As regards reliability, Myotest-T showed high ICCs (range: 0.92-0.96), whereas Myotest-V showed low ICCs (range: 0.56-0.89), and high random errors (>9 cm). In conclusion, Myotest-T is a valid and reliable method for the assessment of vertical jump height, and its use is legitimate for field-based evaluations, whereas Myotest-V is neither valid nor reliable.

The influence of explosive power on the performance of an elite swimmer in 25 and 50 metre pools

“…Jump height was measured by a Myotest device (Myotest, Sion, Switzerland), which is based on 3D acceleration, is designed for commercial use, and is worn at the waist. The validity and reliability of the Myotest device have been recently verified (Casartelli, Muller, & Maffiuletti, 2010;Castagna, 2013;Comstock et al, 2011;Dinu et al, 2011;Gindre et al, 2016;Houel, Faury, & Seyfried, 2013;Choukou, Laffaye, & Taiar, 2013).…”

Correlation Between Speed and Height Jump in Junior Football Players

“…Measurements done with high precision equipment gives us a high degree of confidence compared to previously manual recordings (Houel, Dinu, Faury, Seyfried, 2011), (Casartelli, Müller, Maffiuletti, 2010). Coaches are the first beneficiaries of these study results who have been waiting for a long time for a restructuring concept, methodically speaking (Grosu 2013).…”

Validation of a force platform clinical for the assessment of vertical jump height

“…tlanding) (Bui et al 2015). The literature suggests that the measurement of flight time is the most frequently used and valid and reliable method to calculate the jump height (Casartelli et al, 2010;Dias et al, 2011;Glatthorn et al 2011;Girard et al, 2011). It was calculated by the following formula described in the literature (Aragón-Vargas, 1996): hmax = a x (tof/2) 2 x 2 -1 , where a is the acceleration of gravity (9.81 m·s -2 ).…”