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Latella, C, Teo, WP, Spathis, J, and van den Hoek, D. Long-term strength adaptation: A 15-year analysis of powerlifting athletes. J Strength Cond Res 34 (9): 2412–2418, 2020—Strength is a fundamental component of athletic performance and development. This investigation examined the long-term strength development of powerlifting (PL) athletes. The rate of strength gain/day was assessed in 1897 PL athletes (F= 626, M= 1,271) over a 15-year period (2003–2018). Independent T-tests explored sex differences in baseline absolute (kg) and relative strength (kg· body mass− 1 [bm]) recorded from the first competition, and strength gain/day (kg· d− 1). Analyses based on initial strength quartiles were conducted using one-way analysis of variances with significance set at p< 0.05. Bivariate correlational analysis tested for relationships between strength gain/day and baseline strength, the number of competitions, and …