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D-64 Thematic Poster - IMU’s- More than Step Counters Thursday, June 2, 2016, 3: 15 PM - 5: 15 PM Room: 103

Measuring Fatigue Induced Changes In 3d Trunk Kinematics, Measured By Inertial Magnetic Measurement Units.

2286 Board #4 June 2, 3

15 PM - 5

15 PM

Reenalda, Jasper; Maartens, Erik

Author Information
Medicine & Science in Sports & Exercise: May 2016 - Volume 48 - Issue 5S - p 636
doi: 10.1249/01.mss.0000486907.47758.cb
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Trunk Range of Motion (RoM) during running is hypothesized to be related to back and pelvis injuries. Fatigue might increase this trunk motion. Research on 3D trunk motion has been limited to the laboratory but advances in sensor technology now allow for quantification of the 3D trunk ROM outside the lab on the athletic track.

PURPOSE: To investigate 3D trunk RoM as a consequence of fatigue at the athletic track

METHODS: As part of an ongoing study, five male runners (30.6 +/- 5,6 years, 181.6 +/- 4.0 cm, 69.2 +/- 2.7 kg) performed a fatiguing 20 minute run at Critical Velocity on an athletic track. Two Inertial Magnetic Measurement Units (sampling freq. = 240Hz) were fixed on sternum and sacrum. 3D sternal and sacral orientation was calculated from gyroscope, accelero- and magnetometer IMMU data with respect to a global, static reference frame, constructed from gravity and the Earth’s magnetic north. A calibration procedure is used to translate sensor to body orientations. The relative movement between the trunk and pelvic bodies was calculated and expressed in Euler angles. The RoM is defined as the peak-to-peak amplitude of axial rotation, combining the frontal, sagittal and transversal movement, at every stride. At two stages (3 and 18 min.) RoM over 100 strides was calculated and expressed in angles (degrees). An unpaired two-sample t-test was used to analyse the differences in RoM at the two stages on an individual level.

RESULTS: 3D trunk RoM increased significantly (p<0.001) in all runners.

CONCLUSIONS:Increased trunk RoM was seen towards the end of the fatiguing run. This might increase the risk of back and pelvis injuries as a consequence of repetitive running in the runners natural environment. More subjects are needed to test this hypothesis.

© 2016 American College of Sports Medicine