Fig. 2.

Noise level analysis (phase one). (a) Distribution of mean noise bands for biceps and gastrocnemius. Each data point represents one minute of recording. There was a significant difference in noise levels between biceps and gastrocnemius (p < 0.0001, Mann-Whitney test). (b). Relationships between mean noise band and optimal AT_inc. AT_inc was calculated from manual counts using 10 s windows. The best-fit lines were calculated with weighted least-squares regression due to heteroscedasticity of the data. For biceps (red), n was 295 and r² was 0.648. For gastrocnemius (blue), n was 304 and r² was 0.402. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.).