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Validity and Reliability of a Novel Inertial Measurement Unit for Assessing Vertical Jump Performance

Mathis Rollin¹, Cole Strickland¹, Nikolas Keratsopoulos¹, Jaci Kelly¹, Dimitrije Cabarkapa², and Mandy Parra¹

¹Human Performance Lab; School of Exercise & Sport Science; University of Mary Hardin-Baylor; Belton, TX

²Jayhawk Athletic Performance Laboratory – Wu Tsai Human Performance Alliance, University of Kansas, Lawrence, KS

THIS NOVEL INERTIAL MEASUREMENT UNIT DEVICE WAS DEEMED VALID AND RELIABLE FOR ASSESSING VERTICAL JUMP PERFORMANCE

SECONDARY ANALYSIS & REFERENCES

ACKNOWLEDGEMENTS

Thank you to the UMHB Men's & Women's Basketball teams, UMHB Acrobatics & Tumbling team, and Men’s & Women’s golf team for participating, the respective coaching staffs, and UMHB Human Performance Lab staff for helping in this study.

• Vertical jump (VJ) performance is a key component of many sports and high jumping ability has been correlated with successful athletic development (1-2).
• The countermovement jump (CMJ) is among the most popular jump variation used by sport practitioners (3).
• Currently, force plates (FP) are considered the ‘gold standard’ for assessing jump performance; however, they can be impractical for most athletic programs (4).
• Field-based alternatives exists; however, the reliability and validity are questioned in literature.
• Therefore, the purpose of this study is aimed to investigate the accuracy of a novel inertial measurement unit (IMU) device on the CMJ compared to the FP.

PRACTICAL APPLICATION

These results deemed this IMU device a valid and reliable field-based tool to accurately measure jump performance in a practice setting due to the price, portability, simplicity, and efficiency.

DISCUSSION

• This IMU device utilized in this trial was show to be valid and reliable in all three CMJ metrics compared to the criterion measurement (force plates).
• A secondary analysis in this trial validated the interrater agreement between the left and right IMU device (see QR below) showing the ability in accurate results with only one sensor.
• This device is valid and reliable for assessing VJ performance and neuromuscular fatigue.

METHODS

• Independent t-tests were used to examine differences in each dependent variable between the IMU and FP system.
• Pearson product-moment correlation coefficient (r) for linear regression were used to determine the degree of association between the two testing modalities (IMU vs. FP) for each dependent variable and the intra-class correlation coefficients (ICC) to determine the magnitude of absolute agreement.
• The α level of p<0.05 was used as a criterion for statistical significance.

• 50 (ht. = 181.2±12.3 cm; wt. = 78.0±14.3 kg) NCAA Division-III athletes from the University of Mary Hardin-Baylor volunteered for this study.
• IMU sampling at 500 Hz, was secured over midfoot of both feet using a velcro strap to minimize movement.
• While standing on FP, each athlete completed two CMJs separated by 30 seconds of rest. Athletes were instructed to achieve ~90° knee flexion and told to "jump as high as possible” while keeping hands on hips.
• Unless technically unsound, the second jump was used for analysis and JH, FT, and TOV were the metric of choice.

STATISTICAL ANALYSIS

Table 1: Descriptive statistics for agreement between the IMU device and FP.

Figure 1: Comparison of JH between the IMU device and FP.

Figure 2: Comparison of FT between the IMU device and FP.

Figure 3: Comparison of TOV between the IMU device and FP.

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