Figure 1.

Timeline of study procedures. Study procedures took place over six consecutive 24-hour monitoring periods. Participants were asked to wear an Actical accelerometer to measure activity level on the wrist for six consecutive 24-hour periods. They were also asked to wear a vest, into which a similar accelerometer was built in, for two 24-hour monitoring periods, five days apart (from the start of each monitoring period). Daily morning PEF was measured on days 1–6. Each gray bar represents one 24-hour monitoring period. D₀ = day 0.