Kerry MacDonald1, Roald Bahr2, Jennifer Baltich3, Jackie L Whittaker4, Willem H Meeuwisse5. 1. Sport Injury Prevention Research Centre, Faculty of Kinesiology, University of Calgary, Calgary, Canada. Electronic address: kerry.macdonald@ubc.ca. 2. Oslo Sports Trauma Research Center, Department of Sports Medicine, Norwegian School of Sport Sciences, Oslo, Norway; Aspetar Injury & Illness Prevention Program, Aspetar, Qatar; Orthopaedic and Sports Medicine Hospital, Doha, Qatar. 3. Human Performance Laboratory, Faculty of Kinesiology, University of Calgary, Calgary, Canada. 4. Department of Physical Therapy, Faculty of Rehabilitation Medicine, University of Alberta, Edmonton, Canada; Glen Sather Sports Medicine Clinic, University of Alberta, Edmonton, Canada. 5. Sport Injury Prevention Research Centre, Faculty of Kinesiology, University of Calgary, Calgary, Canada.
Abstract
OBJECTIVES: To validate the use of an inertial measurement unit (IMU) for the collection of total jump count and assess the validity of an IMU for the measurement of jump height against 3-D motion analysis. DESIGN: Cross sectional validation study. SETTING: 3D motion-capture laboratory and field based settings. PARTICIPANTS: Thirteen elite adolescent volleyball players. INDEPENDENT VARIABLES: Participants performed structured drills, played a 4 set volleyball match and performed twelve counter movement jumps. MAIN OUTCOME MEASURES: Jump counts from structured drills and match play were validated against visual count from recorded video. Jump height during the counter movement jumps was validated against concurrent 3-D motion-capture data. RESULTS: The IMU device captured more total jumps (1032) than visual inspection (977) during match play. During structured practice, device jump count sensitivity was strong (96.8%) while specificity was perfect (100%). The IMU underestimated jump height compared to 3D motion-capture with mean differences for maximal and submaximal jumps of 2.5 cm (95%CI: 1.3 to 3.8) and 4.1 cm (3.1-5.1), respectively. CONCLUSION: The IMU offers a valid measuring tool for jump count. Although the IMU underestimates maximal and submaximal jump height, our findings demonstrate its practical utility for field-based measurement of jump load.
OBJECTIVES: To validate the use of an inertial measurement unit (IMU) for the collection of total jump count and assess the validity of an IMU for the measurement of jump height against 3-D motion analysis. DESIGN: Cross sectional validation study. SETTING: 3D motion-capture laboratory and field based settings. PARTICIPANTS: Thirteen elite adolescent volleyball players. INDEPENDENT VARIABLES: Participants performed structured drills, played a 4 set volleyball match and performed twelve counter movement jumps. MAIN OUTCOME MEASURES: Jump counts from structured drills and match play were validated against visual count from recorded video. Jump height during the counter movement jumps was validated against concurrent 3-D motion-capture data. RESULTS: The IMU device captured more total jumps (1032) than visual inspection (977) during match play. During structured practice, device jump count sensitivity was strong (96.8%) while specificity was perfect (100%). The IMU underestimated jump height compared to 3D motion-capture with mean differences for maximal and submaximal jumps of 2.5 cm (95%CI: 1.3 to 3.8) and 4.1 cm (3.1-5.1), respectively. CONCLUSION: The IMU offers a valid measuring tool for jump count. Although the IMU underestimates maximal and submaximal jump height, our findings demonstrate its practical utility for field-based measurement of jump load.
Authors: Johann Windt; Kerry MacDonald; David Taylor; Bruno D Zumbo; Ben C Sporer; David T Martin Journal: J Athl Train Date: 2020-09-01 Impact factor: 2.860
Authors: Joel Mason; Kai Wellmann; Andreas Groll; Klaus-Michael Braumann; Astrid Junge; Karsten Hollander; Astrid Zech Journal: Orthop J Sports Med Date: 2021-04-06
Authors: Brett S Nickerson; Noel F Medrano; Gabriel L Perez; Samantha V Narvaez; Joshua Carrillo; Misael Duque Journal: Biol Sport Date: 2020-07-05 Impact factor: 2.806