title: Change of Direction Deficit: A More Isolated Measure of Change of Direction Performance Than Total 505 Time.
abstract: Nimphius, S, Callaghan, SJ, Spiteri, T, and Lockie, RG. Change of direction deficit: A more isolated measure of change of direction performance than total 505 time. J Strength Cond Res 30 (11): 3024-3032, 2016-Most change of direction (COD) tests use total time to evaluate COD performance. This makes it difficult to identify COD ability because the majority of time is a function of linear running. The COD deficit has been proposed as a practical measure to isolate COD ability independent of sprint speed. This study evaluated relationships between sprint time, 505 time, and COD deficit, and whether the COD deficit identified a different and more isolated measure of COD ability compared with 505 time. Seventeen cricketers performed the 505 for both left and right sides and 30-m sprint tests (with 10-m split time). The COD deficit for both sides was calculated as the difference between average 505 and 10-m time. Correlations were calculated between all variables (p ≤ 0.05). To compare 505 time and COD deficit, z-scores were calculated; the difference in these scores was evaluated for each subject. The COD deficit correlated to 505 (r = 0.74-0.81) but not sprint time (r = -0.11 to 0.10). In contrast, 505 time did correlate with sprint time (r = 0.52-0.70). Five of 17 subjects were classified differently for COD ability when comparing standardized scores for 505 time vs. COD deficit. Most subjects (88-94%) had a meaningful difference between 505 time and COD deficit. Using 505 time to determine COD ability may result in a large amount of replication to linear speed assessments. The COD deficit may be a practical tool to better isolate and identify an athlete's ability to change direction.
authors.affiliation: 1Centre for Exercise and Sport Science, School of Exercise and Health Sciences, Edith Cowan University, Joondalup, Australia; 2School of Health Sciences, The Notre Dame University Australia, Fremantle, Australia; 3Department of Kinesiology, California State University, Northridge, California; and 4Hurley Surfing Australia High Performance Centre, Casuarina, Australia.
authors.forename: Sophia
authors.initials: S
authors.lastname: Nimphius
authors.forename: Samuel J
authors.initials: SJ
authors.lastname: Callaghan
authors.forename: Tania
authors.initials: T
authors.lastname: Spiteri
authors.forename: Robert G
authors.initials: RG
authors.lastname: Lockie
mesh_terms: D000054:Acceleration; D000328:Adult; D056352:Athletes; D054874:Athletic Performance / Q000502:physiology*; D003430:Cross-Sectional Studies; D006801:Humans; D008297:Male; D012420:Running / Q000502:physiology*