Analysing patterns of coordination and patterns of control using novel data visualisation techniques in vector coding

Objective
Vector coding is a non-linear data analysis technique that quantifies inter-segmental coordination and coordination variability. The traditional approach of reporting time-series data from vector coding can be problematic when overlaying multiple trials on the same illustration. The objective of this study was to describe and present novel data visualisations for displaying the coordination pattern, segmental dominancy, range of motion on an angle-angle diagram, and coordination variability. This allows for a comparison of data across multiple participants with a focus on single subject analysis.

Methods
Novel data visualisation techniques that involve the use of colour and data bars to map and profile coordination pattern and coordination variability data.The introduction and profiling of inter-data point range of motion quantifies range of motion of the dominant segment on an angle-angle plot and illustrates patterns of movement control. As an example, the dataset used the Istituto Ortopedico Rizzoli foot model to describe rearfoot-forefoot and shank-foot coordination during stance.

Results
The use of colour mapping provides the option to inspect an entire dataset and to compare data across multiple participants, groups, and segment couplings. Combining coupling angle mapping with segmental dominancy profiling offers an intuitive and instant summary on coupling angle distribution. The novel inclusion of inter-data point range of motion profiling provides meaning to the interpretation of segmental dominancy data and demonstrates distinct patterns of movement control.

Conclusions
The use of colour mapping and profiling techniques highlighted differences in coordination pattern and coordination variability data across several participants that questions the interpretation and relevance of reporting group data. Colour mapping and profiling techniques are ideal reporting methods to compliment prospective multiple single-subject design studies and to classify commonalities and differences in patterns of coordination and patterns of control between individuals or trials. The data visualisation approaches in the current study may provide further insight on overuse injuries, exercise prescription and rehabilitation interventions.

Keywords
Vector codingcoordinationvariabilitycoupling angle mappingsegmental dominancy profiling