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Dale Bickham, Warren Young and Peter Blanch

Objective:

To determine the relationship between lumbopelvic (LP) stabilization strength and pelvic motion during running.

Design:

Runners were assessed for pelvic motion and undertook an LP stabilization strength test.

Participants:

Sixteen elite male middle- and long-distance runners.

interventions:

Pelvis kinematics were assessed while subjects ran at 5 m/s on a treadmill.

Main Outcome Measures:

Angular pelvis displacement was divided into 3 axes of rotation: pelvic tilt, obliquity, and rotation. LP stabilization strength was the capacity to resist increasing static loads applied to each leg and maintain a neutral LP zone. Intercorrelations were calculated for all measures of pelvic motion and LP stabilization strength.

Results:

There were no significant relationships found among any of the variables (P > .05). However, the LP stabilization strength test possessed good interday reliability.

Conclusions:

The relationship between pelvic motion and muscle function should be studied under a variety of other conditions.

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Stephen P. Messier and Mary Ann Brody

This study examined the mechanics of translation and rotation during the conventional and handspring soccer throw-ins. Thirteen male collegiate soccer players were filmed at 100 fps while performing a conventional soccer throw-in for distance. Additionally, two male collegiate and two male youth league soccer players were filmed at 200 fps while performing a handspring throw-in. Analysis of the conventional throw-in revealed that rapid trunk flexion, and shoulder and elbow extension just prior to release appear to make important contributions to the performance variables (initial ball velocity, angle of release, range, angular momentum). Results of the handspring throw-in analysis suggest that the angular momentum generated during the preparatory and ball support phases was transferred to the arms, forearms, and ball during the latter stages of the movement. Although generalization to a larger population is limited, the results of this study suggest that the handspring throw-in technique has the potential to generate greater release velocities and longer throws, thereby enhancing scoring opportunities during throw-in situations.

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Vinícius Yan Santos Nascimento, Rafaela Joyce Barbosa Torres, Natália Barros Beltrão, Priscila Soares dos Santos, André Luiz Torres Pirauá, Valéria Mayaly Alves de Oliveira, Ana Carolina Rodarti Pitangui and Rodrigo Cappato de Araújo

This study evaluated the effects of instability on the EMG activity of scapular stabilizing and upper limb muscles during exercises with axial and rotational load. Twenty male volunteers (20.9 ± 1.8 years, 174.1 ± 0.04 cm, 73.17 ± 8.77 kg) experienced in strength training participated in a crossover design. Muscle activation of anterior deltoid (AD), posterior deltoid (PD), pectoralis major (PM), biceps brachii (BB), triceps brachii (TB), upper trapezius (UT), middle trapezius (MT), lower trapezius (LT), and serratus anterior (SA) were determined on both conditions. Participants performed a single series of 10 repetitions of bench press and fly exercises on stable (bench) and unstable (proprioceptive disc) conditions at 60% of 1-RM. The Friedman test and post hoc Dunn’s indicated that the unstable condition showed greater EMG activity for AD (P = .001) and BB (P = .002) on the fly exercise, SA (P = .001) and LT (P = .048) on the bench press, and PM (P ≤ .002) on both exercises. These results show that using an unstable surface in exercises with rotational load provides superior EMG activity of the agonist muscles, while in exercise with axial load, the instability favors EMG activity of the scapular stabilizing muscles.

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Ziemowit Bańkosz and Sławomir Winiarski

. Prior to measurement, each player took part in a standard (15 min) and a technical (20 min) warm-up. Each person presented three modifications of topspin shots: (f1) topspin forehand against a ball without rotation, played with force, velocity, and rotation of about 75%; (f2) topspin forehand against a

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Lydia R. Vollavanh, Kathleen M. O’Day, Elizabeth M. Koehling, James M. May, Katherine M. Breedlove, Evan L. Breedlove, Eric A. Nauman, Debbie A. Bradney, J. Eric Goff and Thomas G. Bowman

that do not exist in football and ice hockey. The purpose of our study was to establish the frequency of head impacts across impact mechanism and to determine differences in linear and rotational head impact accelerations according to impact mechanism in NCAA Division III men’s lacrosse athletes. We

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Rienk M.A. van der Slikke, Annemarie M.H. de Witte, Monique A.M. Berger, Daan J.J. Bregman and Dirk Jan H.E.J. Veeger

adding mass will increase the inertia, movements require more force, so it is expected to reduce mobility performance. If centrally placed, mass mainly affects forward acceleration, whereas distributed mass also affects maximal rotational speed and rotational acceleration given the increase in rotational

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Aiko Sakurai, Kengo Harato, Yutaro Morishige, Shu Kobayashi, Yasuo Niki and Takeo Nagura

averaged and used in statistical analysis. Normality assumption was first performed using the Shapiro–Wilk test. The dependent variables were anterior inclination, inclination toward the nonlanding side, and rotation toward the nonlanding side in pelvis and trunk at the timing of peak vGRF. The data were

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Georgia M. Black, Tim J. Gabbett, Richard D. Johnston, Geraldine Naughton, Michael H. Cole and Brian Dawson

-field bout duration. Statistical Analyses Log transformation of all data was used to reduce bias and nonuniform error. A linear mixed model with a fixed effect for on-field bout (3 levels; whole-quarter, rotation bout 1, and rotation bout 2) and a random effect for individual player identity were used to

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Alireza Derakhshani, Amir Letafatkar and Zohre Khosrokiani

subjects with unilateral SDRS. Therefore, in the present study, we investigated the effects of 6-week Scapular Upward Rotation and Elevation Exercises (SUREE) (as a distal treatment) with and without visual feedback on neck pain, neck-flexion and rotation ROMs, and JPE in subjects with SDRS. Methods

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Timothy B. Hartwig and Geraldine Naughton

Despite widespread encouragement for children to participate in sport, the efficacy of early sporting pathways remains underexplored. We compared a rotational junior-sport model combining skills from rugby, cricket, and netball with a modified games model. Motion analysis was used to quantify movement. Results revealed no differences between sporting models in relative percent time spent stationary (p = .32), walking (p = .89), jogging (p = .45), and fast running (p =.06). The rotational model had a greater number of skill-development opportunities per minute (median = 3.4) compared with the modified games model (median = 1.1, p = .001). Promising results from varied and rotational skill exposure warrant further elucidation.