English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

The surface over which people complete sports tasks can influence body posture and performance outcomes. PURPOSE: This study compared time to complete a change of direction agility drill and stopping strategies during this drill on different modern sports turfs, including three different artificial turf systems (AS1,AS2, AS3) and a natural grass surface (NS). METHODS: Six participants (ages 19-30 yrs; height = 1.79 ± 0.08 m; mass = 75.9 ± 10.1 kg) were recruited and provided voluntary consent. Each participant performed three trials of a 5-105 agility drill on each of the four surfaces, as quickly as possible. A Fitlight® timing tool was used to collect the performance measure of time to complete the task. The segment positions were collected using the Xsens MVN Awinda inertial motion capture system and the variable of angle between sacrum, heel and ground (SHAng) was determined through Visual3D for the plant leg. RESULTS: The data from three trials for each participant, for each surface, was included in the statistical analysis. The repeated measures ANOVA for each variable yielded significant differences between surfaces. Pairwise comparisons indicated that change of direction time on AS1 (4.70 ± 0.14 s) was significantly less than on AS3 (4.83 ± 0.28 s; p=.007) and NS (4.83 ± 0.30 s; p=.0014). In addition, SHAng 5 on NS (39.0 ± 4.7 deg) was significantly larger than on all artificial surfaces (AS1: 35.1 ± 3.8 deg, p=.014; AS2: 34.9 ± 2.5 deg, p=.002; AS3: 35.4 ± 3.6 deg, p=.019). Last, SHAng 10 on NS (38.5 ± 4.5 deg) was significantly larger than on all artificial surfaces (AS1: 35.7 ± 2.9 deg, p=.024; AS2: 35.7 ± 2.4 deg, p=.022; AS3: 36.1 ± 2.5 deg, p=.028). CONCLUSION: This project indicates that these participants adopted a different stopping strategy on the natural surface than the artificial surfaces. To mitigate the lower resistance to shear forces offered by natural grass, the participants adopted a more upright body position, presumably increasing the normal force as well as the friction utilized at the foot-to-ground interface. Assuming adequate friction is maintained, a smaller SHAng and thus lower body position will provide for an increase in propulsive forces resulting in a faster change in direction and better performance outcome. Funded by Shaw Industries Group, Inc.

Kinetic Strategies during Single-Leg Hopping in Individuals With and Without Chronic Ankle Instability