Journal: Medicine and Science in Sports and Exercise
Article Title: Is Complexity of Daily Activity Associated with Physical Function and Life-Space Mobility among Older Adults?
doi: 10.1249/MSS.0000000000002883
Figure Lengend Snippet: Two samples of the signals used for Lempel–Ziv daily activity behavior pattern complexity estimation. ( Left panel ) A participant from the bottom 5 in terms of daily activity behavior pattern complexity. ( Right panel ) A participant from the top 5 in terms of daily activity behavior pattern complexity. Two accelerometers were worn concurrently (thigh, chest), and posture (lying, sitting, upright) was deduced based on sensor orientations in 5-s nonoverlapping epochs. Upright activities were categorized as upright, walking, or activity other than walking based on the MAD of the epoch. This resulted in five possible physical behavior states for each of the 5-s nonoverlapping epochs. Lempel–Ziv daily activity behavior pattern complexity was calculated as the ratio of the “deflate” compression algorithm compressed byte length to the uncompressed byte length. Note the gap in the data sets between at around the 70 to 80 h. This corresponds to the battery of the chest-worn device running out and being replaced by a charged device to enable more than 3 d of monitoring. The wear periods were concatenated for complexity analyses.
Article Snippet: As described in the AGNES cohort protocol , the participants were asked to wear two triaxial accelerometers (both sampling continuously at 100 Hz, 14-bit ±16 g , eMotion Faros 180, Bittium Corporation, Oulu, Finland, and 13-bit ±16 g , UKK RM42, UKK Terveyspalvelut Oy, Tampere, Finland) for 7 to 10 d before attending a laboratory gait assessment at the University of Jyväskylä, Finland, campus.
Techniques: Activity Assay, Battery