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  • 269 Commercially-available inertial measurement unit underestimates number of jumps for females more than males: implications for load monitoring and injury prevention

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269 Commercially-available inertial measurement unit underestimates number of jumps for females more than males: implications for load monitoring and injury prevention
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  1. Tyler J Tait1,
  2. Lauren C Benson1,
  3. Kimberley Befus1,
  4. John Choi1,
  5. Colin Hillson1,
  6. Carlyn Stilling1,
  7. Sagar Grewal1,
  8. Kerry MacDonald2,
  9. Kati Pasanen1,3,4,5,
  10. Carolyn Emery1,4,5,6,7
  1. 1Sport Injury Prevention Research Centre, Faculty of Kinesiology, University of Calgary, Calgary, Canada
  2. 2Volleyball Canada, Ottawa, Canada
  3. 3Tampere Research Center of Sports Medicine, UKK Institute, Tampere, Finland
  4. 4Alberta Children’s Hospital Research Institute, University of Calgary, Calgary, Canada
  5. 5McCaig Bone and Joint Institute, Cumming School of Medicine, University of Calgary, Calgary, Canada
  6. 6Department of Community Health Sciences, Cumming School of Medicine, University of Calgary, Calgary, Canada
  7. 7Department of Pediatrics, Cumming School of Medicine, University of Calgary, Calgary, Canada

Abstract

Background A high incidence of overuse knee injuries among youth basketball players may be attributed to improperly-managed jump load. Inertial measurement units are effective for counting jumps compared to traditional methods, but devices with a minimum threshold may underestimate total load.

Objective To compare jump counts from a commercially-available inertial measurement units to traditional counting methods for male and female youth basketball players.

Design Cross-sectional.

Setting Youth basketball practices and games.

Patients (or Participants) 46 (19 Female) youth basketball players (ages 13–18).

Interventions (or Assessment of Risk Factors) Jump count and height were recorded using an inertial measurement unit (VERT®Classic) and raters counted the number of jumps from a simultaneous video recording.

Main Outcome Measurements The height of VERT®Classic jumps was compared between males and females. The total number of jumps recorded by the VERT®Classic and evaluated by video raters were compared using intraclass correlation coefficient (ICC(3,k)), mean offset, and Bland and Altman limits of agreement.

Results Males (14.1’ ±3.2’) had a greater jump height than females (9.9’ ±1.3’, p<0.001). For males, VERT®Classic jumps had excellent reliability with video-counted jumps (ICC(3,k)= 0.969), with a mean offset of -1.9 (fewer VERT®Classic) and limits of agreement -7.1 to 3.2 jumps. For females, VERT®Classic jumps had excellent reliability (ICC(3,k)= 0.916), with a mean offset of -9.3 (fewer VERT®Classic) and limits of agreement -28.2 to 9.6 jumps.

Conclusions The VERT®Classic can provide an estimate of jump load and provides a tool to monitor jump load in relation to overuse knee injuries in youth basketball players. Female youth basketball players appear to perform more jumping movements that are not registered by the VERT®Classic compared to males. Female youth basketball players may need an inertial measurement unit with a lower height threshold for jump count in order to more accurately monitor total jump load.

https://doi.org/10.1136/bjsports-2021-IOC.248

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