Sedentary: Sedentary Physical Activity Summary

In PAactivPAL: Summarize Daily Physical Activity from 'activPAL' Accelerometer Data

Description

Summarize sedentary features using proportions and percentiles

Usage

Sedentary(final_dat, bed_time, takeoff_time)

Arguments

final_dat	Raw event file, will be cleaned in this function. Event file is required for this function.
bed_time	Sleep and wake up time log, reported by participants. Log is not required for this function.
takeoff_time	Take on and off time log, reported by participants. Log is not required for this function.

Details

Proportions of sedentary bout greater than 20/60/120 minutes is the ratio of the number of sedentary bouts greater than 20/60/120 minutes to the total number of sedentary recordings.

Total sedentary time greater than 20/60/120 minutes is the summation of the sedentary durations which are greater than 20/60/120 minutes.

To calculate 5%/25%/75%/95% percentile of sedentary time, all of the recorded sedentary durations are listed and R function quantile is used to find the percentiles.

alpha_sed is defined by 1+1/M, where M is the average of log(sedentary bout length /minimum sedentary bout length).

Proportions of sedentary time between 6:00-12:00/12:00-18:00/18:00-22:00 is the ratio of the sedentary durations to the total activity durations between 6:00-12:00/12:00-18:00/18:00-22:00.

Value

Year The calendar year of recorded event

Month The calendar month of recorded event

Day The calendar day of recorded event

Dayofweek The day of that week

Weekday_or_weekend The recored event date is a weekday or weekend (0 for weekday, 1 for weekend)

break_per_day Number of interrupting sedentary behavior during the given period of time

break_rate Rate of interrupting sedentary behavior

mean_sed_bout_length Mean sedentary bout length. It is the average of the duration time for all sedentary activities

prop_of_sed_time_greater_20min Proportions of sedentary bout greater than 20 minutes

prop_of_sed_time_greater_60min Proportions of sedentary bout greater than 60 minutes

prop_of_sed_time_greater_120min Proportions of sedentary bout greater than 120 minutes

total_sed_time_greater_20min Total sedentary time greater than 20 minutes

total_sed_time_greater_60min Total sedentary time greater than 60 minutes

total_sed_time_greater_120min Total sedentary time greater than 120 minutes

percentile_sed_time_5 5% Percentile of sedentary time

percentile_sed_time_25 25% Percentile of sedentary time

percentile_sed_time_50 50% Percentile of sedentary time

percentile_sed_time_75 75% Percentile of sedentary time

percentile_sed_time_95 95% Percentile of sedentary time

alpha_sed alpha of sedentary time, see details

prop_sed_time_6_12 Proportions of sedentary time between 6:00-12:00

prop_sed_time_12_18 Proportions of sedentary time between 12:00-18:00

prop_sed_time_18_22 Proportions of sedentary time between 18:00-22:00

sed_time_in_30_and_60 Minutes Spent in Sitting/Lying Bouts (at least 30 and less 60 minutes in duration)

sed_num_in_30_and_60 Number of in Sitting/Lying Bouts (at least 30 and less 60 minutes in duration)

Examples

#For CRAN less than 5s running time policy, we only select the first day to run.
r2=Sedentary(sample_event[1:3095,],sample_bed_time[1,],sample_takeon_log[1,])
summary(r2)

Example output

$call
Sedentary.default(final_dat = sample_event[1:3095, ], bed_time = sample_bed_time[1, 
    ], takeoff_time = sample_takeon_log[1, ])

$Table
     Year Month Day Dayofweek Weekday_or_weekend break_per_day  break_rate
year 2000     1   1         6                  0            11 2.207702428
     mean_sed_bout_length prop_of_sed_time_greater_20min
year          0.452959596                    36.36363636
     prop_of_sed_time_greater_60min prop_of_sed_time_greater_120min
year                    18.18181818                     9.090909091
     total_sed_time_greater_20min total_sed_time_greater_60min
year                  4.393305556                  3.228972222
     total_sed_time_greater_120min percentile_sed_time_5 percentile_sed_time_25
year                   2.167277778        0.007958333333          0.03169444444
     percentile_sed_time_50 percentile_sed_time_75 percentile_sed_time_95
year           0.1746111112           0.5821666667            1.614486111
       alpha_sed prop_sed_time_6_12 prop_sed_time_12_18 prop_sed_time_18_22
year 1.325474465        75.65161002                   0                   0
     sed_time_in_30_and_60 sed_num_in_30_and_60
year                 69.86                    2

attr(,"class")
[1] "summary.Sedentary"

PAactivPAL documentation built on May 30, 2017, 4:33 a.m.