ActiGraph ACTITRAINER Instrukcja Użytkownika Pobierz pdf (Strona 14)

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How the accelerometer determines PA intensity

 It contains a motion sensor known as an “accelerometer” that

monitors the occurrence and degree of motion.

 A signal is produced. The magnitude and duration of the

signal depends on the amount of motion.

 The activity signals are filtered to eliminate non-human

movement.

 Signals are summed across a user-defined interval called an

“epoch”

 Output is a “count” per epoch. Higher count = greater activity

intensity

Kelli L. Cain, San Diego May 2014

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 118 119

Data Collection Training 1
Overview 2
Coordinating Center Roles 3
Accelerometer Model 4
Tracking 4
Accelerometer Model: 5
 Filter: 6
 Epoch: 7
Nonwear definition: 8
Rewears boosted 9
66% to 86%! 9
Accelerometer Wearing and 10
Tracking: 11
PART 2: PRE-DATA COLLECTION 13
ActiGraph GT3X 15
ActiGraph GT3X+ 16
DO NOT tell participants 18
What do you need? 20
Determining Inventory Needs 22
Device Inventory Form 23
Staffing 24
Stages of Actigraph 26
Charging 27
Initializing 29
Initializing GT3X+ 32
Initializing GT3X 33
Only field that is required 34
86_200600 35
Data screening in the field 37
Wear for 7 complete days 38
Call with any questions 38
Over or under clothing 40
Compliance Elements 42
Instructions 44
Prompting Material Return 46
Prompt Calls 47
Call Schedule 48
Letter for teachers, coaches 50
Stickers, Incentives 51
Access Tracking Database 54
Tracking Outgoing Devices 55
Track Recruitment and Visits 56
NEED TO STRETCH? EAT??? 58
Downloading data from GT3X 61
Downloading data from GT3X+ 62
AGD to DAT 63
DAT use the DAT converter to 64
Raw to AGD (GT3X+ only) 65
Actilife 66
Screen data right away 68
Need dedicated staff person 68
Screening data – Open file 70
One line is 71
ALWAYS 1 hr 71
Top left cell is 71
MIDNIGHT 71
13 hours 72
(NONWEAR) 72
(WEARING) 72
Examples of data 73
Wearing 74
Mail day 74
Typical wearing day 76
DOCUMENTED WEAR DATES 77
Shift worker - SAVE 78
Midnight 79
Non-wearing day 80
Red flag – 24 valid hours 82
This wouldn’t 83
Device is likely 83
Constant, repeating number 84
Other strange data patterns 84
Rewear Decision 86
Ask participant for rewear 87
Rewear delivery 87
Log Entry form 91
School Times Entry form 92
Tracking rewear 94
Data Transfer 96
 Database Management 98
Certification 99
 Downloading Data 100
 Screening Data 100
 Electronic Tracking 100
Data Scoring 101
Program 102
Saving wear time 103
Pointers 104
Combining re-wear files 105
 Cut-points 106
 Filename variables 106
 Energy Expenditure 106
 Bouts 106
 Time Filters 106
Add/Edit Cut-points 107
(Tools/options) 108
Choice of 3 110
Time filters (Tools/Options) 111
One step Create 113
File type Description 114
Energy Expenditure 115
Activity 115
Output: Activity variables 116
Output: Bouts variables 117

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