Hip Stability Isometric Test (HipSIT): Concurrent Validity and Reference Values for CrossFit® Participants.
Thiago R T Santos, Ana Luiza R Rodrigues, Henrique M P Faria and 5 others
PMID 39502539WHAT IT FOUND
HipSIT scores moderately closely tracked a laboratory hip strength test in 111 CrossFit participants, so it can be a quick portable measure.
Use sex and dominant-limb reference values rather than assuming equal scores.
Key findings
01HipSIT scores showed significant positive medium correlations with isokinetic hip measures, with correlation coefficients from 0.36 to 0.49.
02HipSIT values were higher in males than females on both dominant and non-dominant limbs, and higher in the dominant limb than the non-dominant limb.
03Bland-Altman analyses showed most HipSIT and isokinetic peak torque differences fell within limits of agreement, but differences tended to be larger at higher torque values.
STILL TO COME
How it was doneWhat they foundWhat it means for PTs
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What it does not show
The findings are generalizable only to healthy CrossFit practitioners. The study was cross-sectional, so it did not show whether HipSIT can track change over time or predict future injury. Any injury history beyond six months could influence hip performance, but it was not captured reliably because of memory bias. HipSIT and isokinetic testing showed only moderate correlations and may measure different properties of muscle performance. Differences between HipSIT and isokinetic peak torque tended to be larger at higher torque values.
The easy way to misread this
Do not conclude that HipSIT is equivalent to isokinetic testing or that it identifies injury risk. The correlations were moderate, the methods may measure different properties, and the study only included healthy CrossFit practitioners.