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Table 1 Summary of studies that met inclusion criteria – studied populations and accelerometer-specific characteristics of each study

From: A review of accelerometer-derived physical activity in the idiopathic inflammatory myopathies

Authors Population Number of participants Duration of disease Control group Accelerometer device used Duration of accelerometer data collection Body site of accelerometer placement Physical activity measurement Identified associations between accelerometer-assessed physical activity and disease activity
Bachasson et al. [28] Adult IIM cases 5 (DM = 1, IMNM = 3, ASS = 1) Newly diagnosed   GENEActiv 14 days each month for 6 months Wrist-worn ENMO Increasing ENMO followed decreasing CK and increasing SF-36 (no formal statistical test reported)
Stephens et al. [21] JDM 15 Not reported   Actical accelerometer 7 days Right hip Time spent light, moderate or vigorous physical activity Not reported
Mathiesen et al. [22] JDM 31 Range 2–36 years   ActiGraph GT1M accelerometer 7 days Not explicitly describeda Counts per minute Not reported
Pinto et al. [23] JDM 19 Mean 7.6 years (SD 3.2) Healthy controls (n = 19) ActiGraph GT3X 7 days Elastic belt at the waistline Time spent light, moderate or vigorous physical activity Longer disease duration was associated with more time spent in a sedentary state (p-value = 0.026)
Current glucocorticoid use was associated with more time spent in a moderate to vigorous physical activity state (p-value = < 0.001)
Pinto et al. [24] JDM 19 Mean 7.6 years (SD 3.2) JSLE (n = 20) ActiGraph GT3X 7 days Elastic belt at the waistline Time spent light, moderate or vigorous physical activity Not reported
Riisager et al. [25] JDM 21 Median 3.4 years (range 1.4–10.3)   Sense Wear accelerometer Two 3 day periods of data collection, 12 weeks apart Armband on upper arm Number of steps in 48 h period Accelerometer-assessed physical activity improved from 16,412 to 21,079 steps per 48 h period following a 12 week exercise programme (p-value = 0.015)
Habers et al. [26] JDM 26 Median 4.4 years (0.8–11.4) Intervention (home-based exercise programme) group vs control group Actical 7 days – carried out three or four times throughout the study Not explicitly describeda Time spent in inactive, light, moderate or vigorous physical activity No change in accelerometer-assessed physical activity between intervention (treadmill and strength exercise programme) and control groups (p-values = > 0.05)
Berntsen et al. [27] JDM 45 Mean 20.8 years (SD 11.9) Healthy controls (n = 45) Actigraph GT3X 8 days Dominant hip Time spent in inactive, light, moderate or vigorous physical activity. Counts per minute Shorter mean daily time spent in moderate to vigorous physical activity in inactive JDM group, compared to active JDM group (p-value = < 0.01)
  1. aManufacturer recommends the device to be worn on the waist at the mid-axillary line
  2. IIM Idiopathic inflammatory myopathy, JDM Juvenile dermatomyositis, DM Dermatomyositis, IMNM Immune-mediated necrotising myopathy, ASS Anti-synthetase syndrome, SD Standard deviation, JSLE Juvenile systemic lupus erythematosus, CK Creatine kinase, SF-36 36 Item Short Form Survey, MMT-8 Manual muscle testing, ENMO Euclidean norm minus one