Sprinting, Strength, and Architectural Adaptations Following Hamstring Training in Australian Footballers

The aim of this study was to determine the sprinting, strength, and architectural adaptations following a hip‐dominant flywheel (FLY) or Nordic hamstring exercise (NHE) intervention in Australian footballers. Twenty‐seven male athletes were randomized to FLY (n = 13) or NHE (n = 14) training across a 39‐week period (inclusive of pre‐season and in‐season). Biceps femoris long head (BFlh) architecture was assessed throughout. Eccentric hamstring strength and 40 m sprint times (with force‐velocity profiling) were assessed at baseline, end of pre‐season, and following the intervention. After the intervention, BFlh fascicle length was longer in both groups compared to baseline (FLY: 1.16 cm, 95%CI: 0.66 to 1.66 cm, d = 1.99, p