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  • Title: Achilles tendon single bout and season long adaptations during early and late collegiate cross-country season.
    Author: Sponbeck JK, Hunter I, Neves KA, Swanson DC, Swanson DA, Johnson AW.
    Journal: Phys Ther Sport; 2021 Jan; 47():114-119. PubMed ID: 33249366.
    Abstract:
    AIMS: To examine single bout and season long Achilles tendon cross-sectional area (CSA) changes before and after running during the early and late cross-country season. DESIGN: OBSERVATIONAL: repeated measures design study. SETTING: Controlled laboratory setting. PARTICIPANTS: This study consisted of 35 participants. The running group included 11 males and 9 females, the control group was 8 males and 7 females. MAIN OUTCOME MEASURES: Diagnostic ultrasound images were taken before and after runners completed a common recovery run during the early and late cross-country season. Ultrasound images of control participants, who did not run, were taken following an averaged time that athletes spent running. RESULTS: No significant tendon season long CSA increases occurred for runners (p = 0.453). Runners experienced significant Achilles tendon CSA decreases compared within subjects (p < 0.05) and between controls (p < 0.05). Significant CSA decreases occurred for runners during the early and late season run (p < 0.05) with greater percentages of decrease in the early season (p = 0.009). Male and female runners experienced similar CSA decreases while running (p = 0.696). CONCLUSIONS: No Achilles tendon CSA increases occurred over the season. Significant Achilles tendon CSA decreases occurred while running during early and late season runs, but varied with larger CSA decreases occurring during the early season.
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