Full TGIF Record # 236319
Item 1 of 1
DOI:10.1177/1754337113501300
Web URL(s):http://pip.sagepub.com/content/228/1/33.full.pdf
    Last checked: 02/12/2014
    Requires: PDF Reader
    Access conditions: Item is within a limited-access website
Publication Type:
i
Report
Author(s):Twomey, Dara M.; Ullah, Shahid; Petrass, Lauren A.
Author Affiliation:Twomey and Petrass: School of Health Sciences, University of Ballarat, Mt Helen, VIC; Ullah: Flinders Centre for Epidemiology and Biostatistics, School of Medicine, Flinders University, Adelaide, SA, Australia
Title:One, two, three or four: Does the number of Clegg hammer drops alter ground hardness readings on natural grass?
Source:Proceedings of the Institution of Mechanical Engineers, Part P: Journal of Sports Engineering and Technology. Vol. 228, No. 1, March 2014, p. 33-39.
# of Pages:7
Publishing Information:London, England, United Kingdom: Professional Engineering Publishing Limited
Related Web URL:http://pip.sagepub.com/content/228/1/33
    Last checked: 02/12/2014
    Notes: Abstract only
Keywords:TIC Keywords: Athletic fields; Clegg Impact Test; Injurious factors; Playability; Soil moisture; Surface hardness
Abstract/Contents:"The Clegg hammer is currently used to measure hardness of natural turf surfaces to inform performance and safety decisions. However, the number of Clegg hammer drops reported in natural grass testing varies from one to four drops, and the impact of the choice of the number of drops is unknown. The aim of this article is to determine whether significant differences exist between the four Clegg hammer drops on natural grass across a variety of conditions. Hardness readings (using a 2.25 kg Clegg hammer), soil moisture and botanical composition were recorded at nine different sites on seven football fields during an 18-week playing season. A total of 1255 hardness readings were collected for each of four consecutive Clegg hammer drops. Overall, there were significant differences between drop 1 and the other three consecutive drops, on all fields and on all sites. Deep soil moisture was the only factor that significantly influenced the hardness readings. The results of this study demonstrate that the decision regarding the number of drops recorded needs careful consideration as conclusions drawn on playability of a ground or the association with injury risk may vary considerably depending on the number of drops."
Language:English
References:29
Note:Pictures, color
Figures
Tables
Graphs
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Twomey, D. M., S. Ullah, and L. A. Petrass. 2014. One, two, three or four: Does the number of Clegg hammer drops alter ground hardness readings on natural grass?. Proceedings of the Institution of Mechanical Engineers, Part P: Journal of Sports Engineering and Technology. 228(1):p. 33-39.
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DOI: 10.1177/1754337113501300
Web URL(s):
http://pip.sagepub.com/content/228/1/33.full.pdf
    Last checked: 02/12/2014
    Requires: PDF Reader
    Access conditions: Item is within a limited-access website
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