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Durva Vahia, Adam Kelly, Harry Knapman and Craig A. Williams

effort. This method is easy to implement and provides a cost-effective and efficient alternative to HR measures ( 14 , 24 , 25 ). Many studies have investigated the use of sRPE scale as a measure of ITL in soccer ( 1 , 2 , 6 , 7 , 9 , 11 , 18 , 20 , 24 , 25 ). These studies measured the correlation

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Mehmet Uygur, Goran Prebeg and Slobodan Jaric

We compared two standard methods routinely used to assess the grip force (GF; perpendicular force that hand exerts upon the hand-held object) in the studies of coordination of GF and load force (LF; tangential force) in manipulation tasks. A variety of static tasks were tested, and GF-LF coupling (i.e., the maximum cross-correlation between the forces) was assessed. GF was calculated either as the minimum value of the two opposing GF components acting upon the hand-held object (GFmin) or as their average value (GFavg). Although both methods revealed high GF-LF correlation coefficients, most of the data revealed the higher values for GFavg than for GFmin. Therefore, we conclude that the CNS is more likely to take into account GFavg than GFmin when controlling static manipulative actions as well as that GFavg should be the variable of choice in kinetic analyses of static manipulation tasks.

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Adam Culiver, J. Craig Garrison, Kalyssa M. Creed, John E. Conway, Shiho Goto and Sherry Werner

decrease the risk of error. Prior to the study, intrarater reliability was calculated and found to be good for hip abduction (intraclass correlation coefficient [ICC] = .96, 95% CI, .85–.98); hip extension [ICC = .98, 95% CI, .93–.99]); and hip ER (ICC = .87, 95% CI [.59–.97]). Hip strength asymmetry was

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John H. Hollman, Kimberly E. Kolbeck, Jamie L. Hitchcock, Jonathan W. Koverman and David A. Krause

Context:

Hip-muscle weakness might be associated with impaired biomechanics and postures that contribute to lower extremity injuries.

Objective:

To examine relationships between hip-muscle strength, Q angle, and foot pronation.

Design:

Correlational study.

Setting:

Academic laboratory.

Participants:

33 healthy adults.

Main Outcome Measures:

Maximal isometric hip abduction (Abd), adduction (Add), external-rotation (ER) and internal-rotation (IR) strength; Q angle of the knee; and longitudinal arch angle of the foot. We analyzed Pearson product– moment (r) correlation coefficients between the Abd/Add and ER/IR force ratios, Q angle, and longitudinal arch angle.

Results:

The hip Abd/Add force ratio was correlated with longitudinal arch angle (r = .35, P = .025).

Conclusions:

Reduced strength of the hip abductors relative to adductors is associated with increased pronation at the foot. Clinicians should be aware of this relationship when examining patients with lower extremity impairments.

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Erin Strutz, Raymond Browning, Stephanie Smith, Barbara Lohse and Leslie Cunningham-Sabo

in one group will precipitate PA changes in the other group. Thus, for such interventions to be successful, a significant positive correlation between parent and child PA must exist. Previous explorations that have examined the correlation between parent and child PA levels using direct observation

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Shelley L. Holden, Christopher M. Keshock, Brooke E. Forester and Robert J. Heitman

Introduction:

Athlete burnout is a phenomenon that has been studied in previous research and is a concern in terms of athlete’s health and well–being (Capel, Sisley, & Desertrain, 1987; Harris, 2005; Kelley, Eklund, & Ritter-Taylor, 1999; Kjormo & Halvari, 2006; Raedeke, Warren, & Granzyk, 2000). Further, it is assumed by many sport coaches that the longer an athlete competes competitively in a sport, the greater chance for athlete burnout and the potential negative health consequences they could incur.

Purpose:

The purpose of the current study was to determine the correlation between years of sport competition and an athlete’s level of burnout on the Maslach Burnout Inventory (MBI) subscales of Emotional Exhaustion (EE), Depersonalization (DP), and Personal Accomplishment (PA).

Method:

The study was limited female athletes at a Division I institution in the Southeastern United States. Participants for this study were obtained via voluntary participation. The number of female athletes who completed the survey was 99. Athletes who participated were members of the women’s basketball, cross country, golf, soccer, softball, track and field, and volleyball teams.

Results:

The data was analyzed using Pearson correlations. Each burnout subscale was analyzed separately with years of sport competition. Results found no significant (p<.05) correlations between years of sport competition and EE (p=.038), DP (p=.029), or PA (p=-.062).

Conclusion:

The current findings indicate that years of sport competition are not correlated with levels of burnout and female Division I collegiate athletes. Much prior research has also examined intensive training and effects on young athletes and concluded that there are concerns about intense training and psychological injury (Maffulli & Pintore, 1990). Therefore, based upon prior research and the results of the current study, future research should continue to study the effects of years of competition and burnout in order to truly understand its effects on athletes.

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Mark A. Sutherlin, L. Colby Mangum, Jay Hertel, Susan A. Saliba and Joseph M. Hart

Key Points ▸ Correlations exist between anthropometric measures and transversus abdominis and lumbar multifidus muscle thickness, but are influenced by positions and history of low back pain status. ▸ Mass and body mass index were the most consistent normalization variables for the transversus

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Kim Hébert-Losier, Kurt Jensen and Hans-Christer Holmberg

Purpose:

Jumping and hopping are used to measure lower-body muscle power, stiffness, and stretch-shortening-cycle utilization in sports, with several studies reporting correlations between such measures and sprinting and/or running abilities in athletes. Neither jumping and hopping nor correlations with sprinting and/or running have been examined in orienteering athletes.

Methods:

The authors investigated squat jump (SJ), countermovement jump (CMJ), standing long jump (SLJ), and hopping performed by 8 elite and 8 amateur male foot-orienteering athletes (29 ± 7 y, 183 ± 5 cm, 73 ± 7 kg) and possible correlations to road, path, and forest running and sprinting performance, as well as running economy, velocity at anaerobic threshold, and peak oxygen uptake (VO2peak) from treadmill assessments.

Results:

During SJs and CMJs, elites demonstrated superior relative peak forces, times to peak force, and prestretch augmentation, albeit lower SJ heights and peak powers. Between-groups differences were unclear for CMJ heights, hopping stiffness, and most SLJ parameters. Large pairwise correlations were observed between relative peak and time to peak forces and sprinting velocities; time to peak forces and running velocities; and prestretch augmentation and forest-running velocities. Prestretch augmentation and time to peak forces were moderately correlated to VO2peak. Correlations between running economy and jumping or hopping were small or trivial.

Conclusions:

Overall, the elites exhibited superior stretch-shortening-cycle utilization and rapid generation of high relative maximal forces, especially vertically. These functional measures were more closely related to sprinting and/or running abilities, indicating benefits of lower-body training in orienteering.

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Sangwoo Lee, Ronald Davis, Lawrence W. Judge, Young-Hoo Kwon, Kihoon Han, Jemin Kim, Jaewoong Kim and Jaehwa Kim

The purpose of this study was to investigate the relationships among release factors (speed, height, and angle) and distance thrown in Paralympic seated shot put. Fortyeight trials performed by 11 men and 5 women during the 2012 US Paralympic trials in track and field were analyzed. With both genders combined, release speed (r = .95, p < .01) and angle (r = .51, p < .01) showed significant correlations to distance thrown. Release speed (r = .94, p < .01) in men and all release factors (r = .60–.98, p < .02) in women showed significant correlations to distance. Release speed and angle were identified as important predictors of the distance, explaining over 89–96% of the variance in distance thrown. Unlike athletes without disability, seated shotputters exhibited significant positive speed–angle correlations (combined: r = .37, p < .01; women: r = .57, p = .03). Application of these results should address a focus in training on generating speed through the release point with a consistent release angle.

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Niell G. Elvin, Alex A. Elvin, Steven P. Arnoczky and Michael R. Torry

Impact forces and shock deceleration during jumping and running have been associated with various knee injury etiologies. This study investigates the influence of jump height and knee contact angle on peak ground reaction force and segment axial accelerations. Ground reaction force, segment axial acceleration, and knee angles were measured for 6 male subjects during vertical jumping. A simple spring-mass model is used to predict the landing stiffness at impact as a function of (1) jump height, (2) peak impact force, (3) peak tibial axial acceleration, (4) peak thigh axial acceleration, and (5) peak trunk axial acceleration. Using a nonlinear least square fit, a strong (r = 0.86) and significant (p ≤ 0.05) correlation was found between knee contact angle and stiffness calculated using the peak impact force and jump height. The same model also showed that the correlation was strong (r = 0.81) and significant (p ≤ 0.05) between knee contact angle and stiffness calculated from the peak trunk axial accelerations. The correlation was weaker for the peak thigh (r = 0.71) and tibial (r = 0.45) axial accelerations. Using the peak force but neglecting jump height in the model, produces significantly worse correlation (r = 0.58). It was concluded that knee contact angle significantly influences both peak ground reaction forces and segment accelerations. However, owing to the nonlinear relationship, peak forces and segment accelerations change more rapidly at smaller knee flexion angles (i.e., close to full extension) than at greater knee flexion angles.