ArticleJournal of ultrasound2025
The effect of repetitive exercise on tensile changes in the infraspinatus muscle evaluated with ultrasound elastography.
Article in Journal of ultrasound, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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5 authors.
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Abstract
backgroundThe ability to identify muscle strain accurately is a critical aspect in managing exercise-induced muscle damage. Using differences in muscle stiffness as a proxy for muscle damage and recovery can better inform the decision to continue exercise versus pursue recovery. HYPOTHESIS/PURPOSE: To identify changes in rotator cuff stiffness after a single bout of exercise as measured by ultrasound elastography. STUDY
design10 healthy subjects, average age of 23.7, were enrolled in this prospective interventional trial. Each subject had a baseline scan then completed a standardized exercise program followed by another scan and daily evaluations until the results returned to within 10% of baseline.
methodsElastography measurements were collected around the infraspinatus tendon, and the deltoid was used as a baseline standard. STATISTICAL ANALYSIS USED: Summary statistics, t-test, and regression analysis were completed for the data.
resultsAverage strain was 0.5 at baseline, 0.7 immediately post-exercise, 0.6 on follow-up day 1, and 0.4 on follow-up day 2. There were statically significant differences between every timepoint. baseline-post 0.24, (p < 0.0001), post-day1 (decrease of 0.14, p < 0.0001), day1-day2 (decrease of 0.15, p < 0.0001), and BL-day2 (decrease of 0.05, p < 0.005).
conclusionsThese results demonstrate that the infraspinatus muscle stiffness increases immediately after exercise and takes up to 48 h to return to within 10% of baseline. We also found that at day 2 there continued to be an overcorrection with the infraspinatus remaining softer at this time point.
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