The Test Re-Test Reliability of A Novel Single Leg Hop Test (T-Drill Hop Test).
Rodney Negrete, Samantha Simms, Jacob Gross and 5 others
PMID 34123525WHAT IT FOUND
The T-Drill Hop Test showed excellent consistency when healthy young adults repeated it days apart.
It also revealed no time difference between dominant and non-dominant legs in this healthy group, establishing a baseline before testing injured athletes.
Key findings
01The test demonstrated excellent reliability, with Intraclass Correlation Coefficients ranging between 0.98 and 1.00.
02There was no significant difference in completion times between the dominant and non-dominant legs in healthy participants.
03The study population consisted entirely of healthy, recreationally active college-aged individuals, not patients or competitive athletes.
STILL TO COME
How it was doneWhat they foundWhat it means for PTs
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What it does not show
The study included only healthy, non-patient college-aged subjects, so the results do not apply to injured athletes or older populations. The sample had an uneven mix of men and women, and gender differences in hopping performance were noted as a potential confounding factor. No competitive athletes were included, limiting the relevance to high-performance return-to-sport decisions. The study established reliability but did not test validity or compare the T-Drill Hop Test to existing standard hop tests.
Declared interests
The author has no conflict of interest to report.
The easy way to misread this
Do not use the completion times or limb symmetry data from this study to make return-to-sport decisions for injured patients. The data comes from healthy, recreationally active college students, not individuals with lower extremity injuries, so these values are not clinical benchmarks.