reliability

An undergraduate student intern project comparing three GymAware PowerTools to a robotic calibration rig the Australian Institute of Sport (AIS). This pilot study was done by Madeline Black, a University of Canberra student. It was supervised by technical staff in the AIS who have developed a calibration rig specifically for calibrating LPT sensors.


The purpose of this study was to determine the reliability and validity of the GymAware optical encoder (Kinetic, Canberra, ACT) to measure displacement data (distance, peak velocity, mean velocity and time). Three GymAware sensors were attached to a Calibration Rig (CalRIG), a novel piece of technology engineered specifically for accurate calibration of dynamometry equipment. The CalRIG was programmed to perform 4 identical sets of 14 repetitions, each repetition increasing in displacement by 0.1m and 0.2m/s.

Validity of displacement measures by GymAware were evaluated by typical error estimate (TEE), intra- and inter- reliability was assessed through typical error measurement (TEM). TEE values were very low at 0.00m for distance and 0.01m/s for mean and peak velocity variables. TEE was higher at up to 0.16s for time (repetition duration). TEM was 0.00m for distance, 0.01- 0.02m/s for velocity and 0.01-0.02s for repetition duration variables when comparing both between sensors and between sets.

In conclusion, the GymAware optical encoder accurately measured displacement of the CalRIG shaft, thereby indicating its validity as a linear position transducer employed to calculate other strength and power related variables of interest through differentiation of measured displacement data. GymAware was found to be highly reliable with little variation between sets or sensors, of great benefit to practitioners or coaches utilizing GymAware in assessment and monitoring of athletic performance over time.

It is recommended that consumers use velocity as a performance indicator as the measurement of this variable showed only minor error. A Smith machine is also recommended during resistance exercises to control the direction of displacement and facilitate measurement. read more...

GymAware Articles

Read the stories below to learn more:
Bryan Mann
Dr Bryan Mann MS, PhD, CSCS

Assistant Director of Strength and Conditioning, University of Missouri.

Mladen Jovanovic
Mladen Jovanovic
Strength & Conditioning Coach, Port Adelaide FC.
Madeline Black: GymAware Reliability
Madeline Black
Bachelor of Sport Coaching and Exercise Science
Kristie Taylor
Kristie Taylor
Sport Scientist (PhD), Strength & Conditioning Coach
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