reliability 32 , 33 for measuring 3-dimensional angular movements. Accelerations derived from 3 of the 12 IMUs were used for analysis in this study. Those were the 3 IMUs positioned along the spine and included the pelvis, lower spine, and the upper spine positions (Figure 1 ). These positions were chosen
Craig A. Staunton, Mikael Swarén, Thomas Stöggl, Dennis-Peter Born, and Glenn Björklund
Niels J. Nedergaard, Mark A. Robinson, Elena Eusterwiemann, Barry Drust, Paulo J. Lisboa, and Jos Vanrenterghem
To investigate the relationship between whole-body accelerations and body-worn accelerometry during team-sport movements.
Twenty male team-sport players performed forward running and anticipated 45° and 90° side-cuts at approach speeds of 2, 3, 4, and 5 m/s. Whole-body center-of-mass (CoM) accelerations were determined from ground-reaction forces collected from 1 foot–ground contact, and segmental accelerations were measured from a commercial GPS accelerometer unit on the upper trunk. Three higher-specification accelerometers were also positioned on the GPS unit, the dorsal aspect of the pelvis, and the shaft of the tibia. Associations between mechanical load variables (peak acceleration, loading rate, and impulse) calculated from both CoM accelerations and segmental accelerations were explored using regression analysis. In addition, 1-dimensional statistical parametric mapping (SPM) was used to explore the relationships between peak segmental accelerations and CoM-acceleration profiles during the whole foot–ground contact.
A weak relationship was observed for the investigated mechanical load variables regardless of accelerometer location and task (R 2 values across accelerometer locations and tasks: peak acceleration .08–.55, loading rate .27–.59, and impulse .02–.59). Segmental accelerations generally overestimated whole-body mechanical load. SPM analysis showed that peak segmental accelerations were mostly related to CoM accelerations during the first 40–50% of contact phase.
While body-worn accelerometry correlates to whole-body loading in team-sport movements and can reveal useful estimates concerning loading, these correlations are not strong. Body-worn accelerometry should therefore be used with caution to monitor whole-body mechanical loading in the field.
Jurdan Mendiguchia, Adrián Castaño-Zambudio, Pedro Jiménez-Reyes, Jean–Benoît Morin, Pascal Edouard, Filipe Conceição, Jonas Tawiah-Dodoo, and Steffi L. Colyer
, and in turn, maximal sprint speed. Therefore, the aim of the present study was to examine if a specific 6-week multimodal intervention combined with an on-field running technique program induced changes in pelvis and lower-limb kinematics at maximal speed. Based on our recent study showing changes in
Heather K. Vincent, Laura A. Zdziarski, Kyle Fallgatter, Giorgio Negron, Cong Chen, Trevor Leavitt, MaryBeth Horodyski, Joseph G. Wasser, and Kevin R. Vincent
, handheld bottles restrict natural motion of the control elbow, minimize trunk-to-pelvis crossover, and shift the COM for stability. Partially full bottles introduce a complicating factor of sloshing when moved. Sloshing fluid mass from bottles in the hand or worn at the waist creates momentum forces that
Kym J. Williams, Dale W. Chapman, Elissa J. Phillips, and Nick Ball
to define the foot (calcaneus, proximal phalanx of the big toe, and proximal phalanx of little toe), pelvis (left and right anterior superior iliac spine and posterior superior iliac spine), and trunk (clavicle, sternum, C7 vertebra, and T10 vertebra). 29 The athlete’s center-of-mass (COM) position
Scott R. Brown, Erin R. Feldman, Matt R. Cross, Eric R. Helms, Bruno Marrier, Pierre Samozino, and Jean-Benoît Morin
sprint faster. Additionally, it could be speculated that both legs and adjacent structures (pelvis, spine) may experience unnecessary or even hazardous stress due to exceeding physical capacities or imbalance-related compensations. The data presented in this case study favors the notion that greater hip
Kadhiresan R. Murugappan, Michael N. Cocchi, Somnath Bose, Sara E. Neves, Charles H. Cook, Todd Sarge, Shahzad Shaefi, and Akiva Leibowitz
.3–5.1), acidemia with serum bicarbonate of 8 mEq/L (reference range 22–32), and acute kidney injury with a serum creatinine of 1.98 mg/dl (reference range 0.5–1.2). Imaging studies including computed tomography scans of the head, cervical spine, chest, abdomen, and pelvis were unrevealing. A urine toxicology
Bryan Holtzman, Adam S. Tenforde, Allyson L. Parziale, and Kathryn E. Ackerman
-bearing sport (e.g., a swimmer doing resistance training) were classified as weight bearing Stress reaction/fracture • Assessed through self-reported stress fracture or stress reaction and site of injury • 2 points: ≥2 BSI or ≥1 BSI at femoral neck, sacrum, or pelvis • 1 point: 1 BSI Note . BEDA-Q = brief
Mathieu Lacome, Simon Avrillon, Yannick Cholley, Ben M. Simpson, Gael Guilhem, and Martin Buchheit
the exercise positioned slightly ahead of a wall (∼10 cm) with a partner applying a pressure to the hip (Figure 3 ). As a deadlift exercise, and with a pelvis anteversion, players slowly leaned forward (ie, flexing the hip) during the eccentric phase, maintaining trunk and hips help in a neutral
Lasse Ishøi, Per Aagaard, Mathias F. Nielsen, Kasper B. Thornton, Kasper K. Krommes, Per Hölmich, and Kristian Thorborg
rigid belt was placed around the pelvis to minimize any hip flexion during testing. The dynamometer was placed posteriorly at the ankle 5 cm proximal to the lateral malleolus and fixated by an external rigid belt fastened to the floor. Two isometric warm-up trials with contractions at approximately 50