Audio Abstracts are changing the way scientific research is being communicated. Watch Sophia’s video below where she delves into her article ‘Change of Direction Deficit: A More Isolated Measure of Change of Direction Performance Than Total 505 Time’, highlighting the purpose of the study, its limitations and the practical applications. If you want to read the abstract or access the full paper (where available), all links are below.

The full paper can be found on Researchgate

Sophia can be found on Twitter @docsoph

Abstract: Most change of direction (COD) tests use total time to evaluate COD performance. This makes it difficult to identify COD ability, since 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 to 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 were evaluated for each subject. The COD deficit correlated to 505 (r = 0.74-0.81) but not sprint time (r = -0.11-0.10). In contrast, 505 time did correlate with sprint time (r = 0.52-0.70). Five of seventeen subjects were classified differently for COD ability when comparing standardized scores for 505 time versus COD deficit. The majority of 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.