Mechanical Player Load™ using trunk-mounted accelerometry in football: Is it a reliable, task- and player-specific observation?
The aim of the present study was to examine reliability and construct convergent validity of Player Load™ (PL) from trunk-mounted accelerometry, expressed as a cumulative measure and an intensity measure (PL · min-1). Fifteen male participants twice performed an overground football match simulation that included four different multidirectional football actions (jog, side cut, stride and sprint) whilst wearing a trunk-mounted accelerometer inbuilt in a global positioning system unit. Results showed a moderate-to-high reliability as indicated by the intra-class correlation coefficient (0.806-0.949) and limits of agreement. Convergent validity analysis showed considerable between-participant variation (coefficient of variation range 14.5-24.5%), which was not explained from participant demographics despite a negative association with body height for the stride task. Between-task variations generally showed a moderate correlation between ranking of participants for PL (0.593-0.764) and PL · min-1(0.282-0.736). It was concluded that monitoring PL®in football multidirectional actions presents moderate-to-high reliability, that between-participant variability most likely relies on the individual's locomotive skills and not their anthropometrics, and that the intensity of a task expressed by PL · min-1is largely related to the running velocity of the task.
a Sport Sciences , Liverpool John Moores University , Liverpool , England.
Paulo
P
Barreira
a Sport Sciences , Liverpool John Moores University , Liverpool , England.
Mark A
MA
Robinson
a Sport Sciences , Liverpool John Moores University , Liverpool , England.
Barry
B
Drust
a Sport Sciences , Liverpool John Moores University , Liverpool , England.
Niels
N
Nedergaard
a Sport Sciences , Liverpool John Moores University , Liverpool , England.
Raja Mohammed Firhad
RMF
Raja Azidin
a Sport Sciences , Liverpool John Moores University , Liverpool , England.
Jos
J
Vanrenterghem
D000054:Acceleration; D061725:Accelerometry / Q000379:methods*; D000328:Adult; D000886:Anthropometry; D001696:Biomechanical Phenomena; D040362:Geographic Information Systems; D006801:Humans; D007590:Jogging / Q000502:physiology; D008297:Male; D009048:Motor Skills / Q000502:physiology; D015203:Reproducibility of Results; D012916:Soccer / Q000502:physiology*; D013647:Task Performance and Analysis; D060726:Torso
Accelerometry; football; reliability; validity