A Critical Review of the Methods Used to Measure, Analyse and Interpret Kinetic Asymmetries During Cycling

The aim of this review was to critically assess the current methods of measuring, analysing and interpreting kinetic asymmetries during cycling. Although it has been conjectured that cycling asymmetrically may increase the risk of developing overuse injuries, and could compromise performance due to premature fatigue, there is a lack of evidence to support these claims. Many research studies in this field demonstrate conflicting findings which could be attributed to the heterogeneity of the research study characteristics. This review showed there is currently no consistent definition to classify cyclists’ pedalling as (a)symmetrical, and the magnitude of the measured asymmetry can be affected by methodological factors including: the location of the power meter on the bicycle, the cycling metric assessed for asymmetry and, the calculation used to quantify interlimb differences. The participants’ knowledge of the intent to investigate asymmetry may also result in less innate cycling techniques. Future research study designs in this field require standardisation to develop a clearer understanding of potential causes and/or effects of asymmetries during cycling.