@article { , title = {Quantifying technical actions in professional soccer using foot-mounted inertial measurement units}, abstract = {Objectives: This study aimed to (i) establish the concurrent validity and intra-unit reliability of a foot-mounted inertial measurement unit for monitoring soccer technical actions, (ii) quantify the within-microcycle inter-positional differences in the technical actions of professional soccer training, and (iii) determine the influence of drill category on the technical actions of professional soccer training. Methods: Twenty-one professional soccer players’ technical performance data (ball touches, releases, ball touches per minute, releases per minute), collected during training sessions throughout twenty-four weekly microcycles, were analysed using general linear modelling. Results: The inertial measurement unit exhibited good concurrent validity (PA=95.1\%–100.0\%) and intra-unit reliability (PA=95.9\%–96.9\%, CV=1.4\%–2.9\%) when compared with retrospective video analyses. The most ball touches ((Formula presented.) = 218.0) and releases ((Formula presented.) = 110.8) were observed on MD–1, with MD–5 eliciting the highest frequency of ball touches ((Formula presented.) = 3.8) and releases ((Formula presented.) = 1.7) per minute. Central midfielders performed the most ball touches ((Formula presented.) = 221.9), releases ((Formula presented.) = 108.3), ball touches per minute ((Formula presented.) = 3.4) and releases per minute ((Formula presented.) = 1.6). Small-sided games evoked more ball touches ((Formula presented.) diff= 1.5) and releases per minute ((Formula presented.) diff= 0.1) than previously reported in match-play. The fewest ball touches ((Formula presented.) = 1.2) and releases per minute ((Formula presented.) = 0.5) were observed during tactical drills. Conclusion: The results of this study provide a novel understanding of the within-microcycle, inter-positional and drill category differences in the technical actions performed by professional players during training.}, doi = {10.1080/24733938.2021.1910333}, eissn = {2473-4446}, issn = {2473-3938}, journal = {Science and Medicine in Football}, publicationstatus = {Published}, publisher = {Taylor \& Francis}, url = {https://hull-repository.worktribe.com/output/3747148}, keyword = {Health and Health Inequalities, Professional soccer training, technical actions, player monitoring, microcycle, microtechnology}, year = {2024}, author = {Marris, Joshua and Barrett, Steve and Abt, Grant and Towlson, Chris} }