Evaluate the collective function of references cited together in a given text segment.
Classify their combined role into one of the following categories: 'method', 'background', or 'result'.

Text:…important disadvantages, such as Golgi tendon organ and myotatic reflex inhibition, which can lead to an increased injury risk (Jubeau et al, 2006; Requena et al., 2005), and some difficulties in obtaining improvements in agonist and antagonist muscle coordination (Holcomb, 2005; Paillard, 2008).
Category: