Resisted sprint training with combined loads improve the maximum velocity in professional female soccer

We analysed the long-term adaptations of resisted sprint training (RST) with combined loads on the performance and kinematics of the maximal velocity (MV). One team women's professional soccer players performed a six-week training programme with progressive sled loading from 20% to 80% of body mass. Pre-training, post-training and detraining measures were obtained for sprint times for 0-20 m, 20-30 m and 0-30 m, while step length (SL), step rate (SR), step velocity, trunk, hip, thigh, knee, shank ankle, foot and centre of mass (CoM) angles were digitised with an 18-point human model. Two points were included: toe-off and touchdown, and both legs ipsilateral and contralateral. Sprint times were significantly reduced in the acceleration and MV phase, with a homogeneous individual response within the group. There were no significant alterations in the angles of the trunk, hip, thigh, knee, shank, ankle and foot across the different tests, nor in SR. Significant alterations in CoM-angle, step velocity and higher SL were observed. RST with progressive of combined loads effectively improved MV performance without causing changes that generated an adverse effect on sprint kinematics. The study offers an RST training programme to enhance sprint performance in professional female soccer.