Previous work demonstrates that eccentric load associated with baseball pitching results in swelling of the infraspinatus, with accompanying changes in glenohumeral flexibility. Infraspinatus swelling and flexibility measurements provide markers for both trauma that results from pitching and a means to monitor recovery following pitching. The purpose of this study was to longitudinally track changes in measures of infraspinatus swelling (cross-sectional area and echo intensity) and humeral rotation flexibility daily, up to 7 days following a bout of pitching. Ten Division 1 baseball pitchers volunteered as participants. One general linear model was run to analyze change in scores per dependent variable per limb (twelve in total). Infraspinatus cross-sectional area increased one day following pitching and internal rotation decreased for three days after pitching. Baseball pitchers cause damage that can last up to 3 days. Recovery must occur to pitch on subsequent days so arms may return to baseline before reapplying stress.