“Reliability of the accelerometer to control the effects of physical activity in older adults,” by Manne Godhe, Marjan Pontén, Johnny Nilsson, Lena V. Kallings, and Eva A. Andersson (PLoS ONE 17(9): e0274442. doi.org/10.1371/journal.pone.0274442, XML, HTML, and .pdf format, 24p.).
journals.plos.org/plosone/article?id=10.1371/journal.pone.0274442
