Author(s): AKYILDIZ, Z., SENTURK, D., Institution: AFYON KOCATEPE UNIVERSITY, Country: TURKEY, Abstract-ID: 440

INTRODUCTION:
Linear position transducers (LPTs) are portable and practical instruments that measure the
displacement and velocity of an object using optical encoding technology. LPTs are widely used
in training and athletes physical rehabilitation due to the widespread adoption of velocity-based
training. LPTs also measure the distance traveled by the bar, and this function of the LPT can be
used to assess vertical jump height before a training session to measure the athletes preparation
and recovery. This study aimed to assess the concurrent validity and intra-device reliability of a
linear position transducer (LPT) for counter-movement jump (CMJ) height. The Gymaware RS
model was analyzed for intra-unit reliability by obtaining data from two devices simultaneously.
METHODS:
Twenty-six subjects (22.21 ± 5.3 years) performed five CMJs using a force plate (Forcedecks) concurrently
with the LPT to test validity. Data were taken from two units simultaneously to examine their
values for inter-unit reliability.
RESULTS:
A paired t-test showed a significant difference between the two devices (Forcedecks and
Gymaware RS ) for CMJ (p < 0.001). Bland-Altman analysis for validity revealed that LPT
overestimated jump height for CMJ in both units, Gymaware RS unit 1 (MD = 6.18 cm) and
Gymaware RS unit 2 (MD = 6.38 cm). Gymaware RS unit 1 (CV%: 1.41) and Gymaware RS unit
2 (CV%: 1.14) units appear below 5% CV, as does the forcedecsk force platform (CV%: 1.41).
Reliability of the Gymaware RS unit 1 and Gymaware RS unit 2, intraclass correlation (ICC) for
CMJ (ICC = 0.97) was high.
CONCLUSION:
The Gymaware RS overestimates jump height but is a reliable tool for tracking changes in jump
height to measure performance improvement and monitor fatigue