Findings
High validity for velocity (R² = 0.935 vs Vicon, R² = 0.968 vs T-Force). Moderate to high ICCs (0.662–0.938) for intra-day reliability. Vmaxpro overestimated velocities by 0.06 m/s.
- Random measurement and prediction errors limit the practical relevance of two velocity sensors to estimate the 1RM back squat
- Validity and Reliability of the VmaxPro IMU for back squat exercise in multipower machine
- Implementing a velocity-based approach to resistance training: the reproducibility and sensitivity of different velocity monitoring technologies
- Valid and Reliable Barbell Velocity Estimation Using an Inertial Measurement Unit
- Validity and Effects of Placement of Velocity-Based Training Devices
- Validity and Test-Retest Reliability of the Vmaxpro Sensor for Evaluation of Movement Velocity in the Deep Squat
- Evaluation of the Vmaxpro sensor for assessing movement velocity and load-velocity variables: accuracy and implications for practical use
- Velocity-Based Strength Training: The Validity and Personal Monitoring of Barbell Velocity with the Apple Watch
- Concurrent validity of VmaxPro, Kinovea, and Speedograph for the assessment of peak barbell velocity during the bench press: A comparison of technological approaches and historical evolutions
- Validity and Reliability of a Commercially Available Inertial Sensor for Measuring Barbell Mechanics during Weightlifting
The Journal of Strength and Conditioning Research
Validity and Test-Retest Reliability of the Vmaxpro Sensor for Evaluation of Movement Velocity in the Deep Squat
We aimed at assessing the validity and test-retest reliability of the inertial measurement unit-based Vmaxpro sensor compared with a Vicon 3D motion capture system and the T-Force sensor during an incremental 1-repetition maximum (1RM) test and at submaximal loads. Nineteen subjects reported to the laboratory for the 1RM test sessions, whereas 15 subjects carried out another 3 sessions consisting of 3 repetitions with 4 different intensities (30, 50, 70, and 90% of 1RM) to determine the intra- and interday reliability. The Vmaxpro sensor showed high validity (Vicon: R2 = 0.935; T-Force: R2 = 0.968) but an overestimation of the mean velocities (MVs) of 0.06 ± 0.08 m·s−1 and 0.06 ± 0.06 m·s−1 compared with Vicon and T-Force, respectively. Regression analysis indicated a systematic bias that is increasing with higher MVs. The intraclass correlation coefficients (ICCs) for Vmaxpro were moderate to high for intraday (ICC: 0.662–0.938; p ≤ 0.05) and for interday (ICC: 0.568–0.837; p ≤ 0.05) reliability, respectively. The Vmaxpro is a valid and reliable measurement device that can be used to monitor movement velocities within a training session. However, practitioners should be cautious when assessing movement velocities on separate days because of the moderate interday reliability.