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:The participants tested in the present study were comparable to similar groups of older men tested in our laboratory; the sVO2p values in the full step (44 ± 11 s), which are greater than those generally reported for healthy younger adults (*20–30 s) (DeLorey et al. 2004; Gurd et al. 2006, 2008; Murias et al. 2010), are similar to pretraining values recently reported (43 ± 11 s) by Murias et al. (2010) in a study of older men of the same age and fitness (age, 68 ± 7 years, VO2peak, 2.
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