The influence of providing feedback on force production and within-participant reproducibility during maximal voluntary exertions for the anterior deltoid, middle deltoid, and infraspinatus

Normalizing shoulder EMG: An optimal set of maximum isometric voluntary contraction tests considering reproducibility

“…Root Mean Square -RMS, Low Pass filtering, …). As demonstrated by Fischer et al for the deltoid muscle during a sub-maximal exertion, the method used to extract the peak activation from the EMG envelope influences the intra-session repeatability (Fischer et al, 2010). The influence of these choices on the inter-session repeatability of the normalization procedure has not been evaluated yet.…”

The use of surface electrodes to record infraspinatus activity is not valid at low infraspinatus activation levels

“…As infraspinatus is superficial and easily accessible between trapezius and deltoid, surface electrodes are commonly used to record activity from this rotator cuff muscle (Arwert et al, 1997;Clisby et al, 2008;Decker et al, 2003;Dickerson et al, 2008;Fischer et al, 2010;Wickham et al, 2010). Only two studies have compared infraspinatus activity using surface and intramuscular electrodes (Jaggi et al, 2009;Waite et al, in press).…”

Exploring the effect of repeated-day familiarization on the ability to generate reliable maximum voluntary muscle activation

“…Similar research should be conducted in female participants as well, given that it has been suggested that females sometimes have more difficulty generating maximum contractions (Vera-Garcia et al, 2010). Finally, providing sensory feedback to participants during MVCs may be a way to improve reliability, as has been shown previously in shoulder muscles (Fischer et al, 2010).…”