Abstract
There is a growing interest in scientific literature on identifying how and to what extent interventions applied to a specific body region influence the responses and functions of other seemingly unrelated body regions. To investigate such a construct, it is necessary to have a global multivariate model that considers the interaction among several variables that are involved in a specific task and how a local and acute impairment affects the behavior of the output of such a model. We developed an artificial neural network (ANN)-based multivariate model by using parameters of motor skills obtained from kinematic, postural control, joint torque, and proprioception variables to assess the local fatigue effects of the abductor hip muscles on the functional profile during a single-leg drop landing and a squatting task. Findings suggest that hip abductor muscles' local fatigue produces a significant effect on a general functional profile, built on different control systems. We propose that expanded and global approaches, such as the one used in this study, have great applicability and have the potential to serve as a tool that guarantees ecological validity of future investigations.
Highlights
There is a growing interest in scientific literature on identifying how and to what extent interventions applied to a specific body region influence the responses and functions of other seemingly unrelated body regions
We propose a global multivariate model based on artificial neural networks that produces as output a general functional profile, built from information from different control systems, which allows us to access the effects of local muscle fatigue on tasks that imply body performance as a single system
Part of our results are expressed as the multiplication factor (MF) value of each condition that is multiplied by the constant value of each variable
Summary
There is a growing interest in scientific literature on identifying how and to what extent interventions applied to a specific body region influence the responses and functions of other seemingly unrelated body regions. Several studies have shown the isolated effects of hipabductor fatigue on postural control [15]; torque distribution and dynamics of the lower limb joints [16]; sense of joint position [17]; and motor capacities involved in the drop-landing task [18] These analyses are fragmented and do not access the interdependence among the parameters affected by the hip-abductor muscles’ local fatigue. Thereby, analyses made so far do not allow understanding of the effect of local fatigue in a general functional profile of the subject To investigate this construct, a global multivariate model is necessary, which considers the interaction of several variables involved in a motor task and how the hip-abduction force decrease, induced by muscle fatigue, affects the model output behavior
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