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Esther Morencos, Blanca Romero-Moraleda, Carlo Castagna and David Casamichana

by the manufacturer 8 and are similar to those used by time motion investigations in hockey. 10 The numbers of accelerations and decelerations were analyzed using recently defined thresholds (low, 1–1.9 m·s −2 ; moderate, 2–2.9 m·s −2 ; high, >3 m·s −2 ). 19 Sprint number, sprint distance, and

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Pedro Jiménez-Reyes, Amador García-Ramos, Victor Cuadrado-Peñafiel, Juan A. Párraga-Montilla, José A. Morcillo-Losa, Pierre Samozino and Jean-Benoît Morin

Soccer and futsal are 2 popular sports in many countries. 1 Although soccer and futsal present different physical demands, the ability to perform accelerations and sprints is of paramount importance for reaching success in both sports. 2 – 5 Thus, it is not surprising that numerous studies have

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Elizabeth L. Stegemöller, Joshua R. Tatz, Alison Warnecke, Paul Hibbing, Brandon Bates and Andrew Zaman

velocity and acceleration, respectively. Peak velocity and peak acceleration were marked in a similar fashion to peak flexion and averaged across conditions. Peak EMG amplitude and area under the curve were obtained for each movement for both the first dorsal interosseous and extensor digitorum communis

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Mohamed S. Fessi, Fayçal Farhat, Alexandre Dellal, James J. Malone and Wassim Moalla

velocities. 12 – 14 Recently, the metabolic-power concept 10 , 11 was suggested as a new GPS parameter estimated from acceleration and deceleration phases according to the theoretical approach introduced by di Prampero et al. 16 This new approach could help coaches better understand the positional demands

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Alejandro Muñoz, Álvaro López-Samanes, Alberto Pérez-López, Millán Aguilar-Navarro, Berta Moreno-Heredero, Jesús Rivilla-García, Pablo González-Frutos, José Pino-Ortega, Esther Morencos and Juan Del Coso

Handball is an intermittent team sport characterized by high-intensity actions such as accelerations and decelerations, fast changes of direction, running sprints, and collisions with opponents. 1 , 2 At the elite level, women handball players cover ∼4000 m during a match while high

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Pedro Figueiredo, George P. Nassis and João Brito

/h), sprints (>19.8 km/h), number of accelerations, number of decelerations, dynamic stress load (total of weighted impacts), and total load (total of accelerometer-derived forces applied on the player without any weightings). Magnitude-based inference statistics were used to compare measures over the 3 days

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Heidi R. Thornton, Jace A. Delaney, Grant M. Duthie and Ben J. Dascombe

During the same training camp, 9 a research abstract showed that an increased acceleration/deceleration load (SumAccDec) was associated with very likely small increases in sleep duration (effect size [ES] = 0.27; ±0.16), time in bed (TIB; ES = 0.25; ±0.16), and sleep-onset latency (ES = 0.20; ±0

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Jairo H. Migueles, Alex V. Rowlands, Florian Huber, Séverine Sabia and Vincent T. van Hees

science, and thanks to technological evolution towards smaller, cheaper, and power efficient sensors, accelerometers now tend to store ‘raw’ data for offline processing and analysis. The data recorded are typically expressed in gravitational acceleration ( g ) because this is the reference point for

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Sarah G. Sanders, Elizabeth Yakes Jimenez, Natalie H. Cole, Alena Kuhlemeier, Grace L. McCauley, M. Lee Van Horn and Alberta S. Kong

physical activity (MVPA) on all 7 days in the past week (2013 Youth Risk Behavior Surveillance System). 4 Accelerometers, small electronic devices that measure gravitational accelerations that occur with movement, provide device-based measures of free-living MVPA. In a nationally representative sample of

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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.