Search Results

You are looking at 1 - 10 of 14 items for :

  • Physical Education and Coaching x
Clear All
Restricted access

Niels J. Nedergaard, Mark A. Robinson, Elena Eusterwiemann, Barry Drust, Paulo J. Lisboa and Jos Vanrenterghem

Purpose:

To investigate the relationship between whole-body accelerations and body-worn accelerometry during team-sport movements.

Methods:

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.

Results:

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.

Conclusions:

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.

Restricted access

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

Restricted access

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

Restricted access

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

Restricted access

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

Restricted access

João Ribeiro, Luís Teixeira, Rui Lemos, Anderson S. Teixeira, Vitor Moreira, Pedro Silva and Fábio Y. Nakamura

, while maintaining neutral spine and pelvis positions. 15 For both exercises, a load of 10% of body mass was gradually added in each set until a decrease in MPP was observed (after 5–6 sets on average). A 5-minute interval was provided between sets. To determine MPP, a small valid, reliable

Restricted access

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

Restricted access

Herbert Wagner, Patrick Fuchs, Andrea Fusco, Philip Fuchs, Jeffrey W. Bell and Serge P. von Duvillard

. In male team handball players, ball velocity in throwing is due to an optimal throwing technique determined by an optimal proximal-to-distal sequencing as well as a high pelvis, trunk, and shoulder internal rotation angular velocity. 24 – 26 Conversely, we found a high and significant correlation

Restricted access

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

Restricted access

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