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) |