Feasibility and effectiveness of online physical activity advice based on a personal activity monitor: randomized controlled trial.
BACKGROUND
Inactive people are often not aware of the fact that they are insufficiently active. Providing insight into their actual physical activity (PA) levels may raise awareness and could, in combination with tailored PA advice, stimulate a physically active lifestyle.


OBJECTIVE
This study evaluated the feasibility and effectiveness of a 3-month intervention in which Dutch office workers were provided with a personal activity monitor (PAM) coupled to simple and concise Web-based tailored PA advice (PAM COACH).


METHODS
Participants were randomly assigned to the 3-month PAM intervention (n = 51) or received a single written information brochure with brief general PA recommendations (n = 51). Study outcome measures were changes in PA (recall of minutes per week spent on PA, as measured by the Activity Questionnaire for Adolescents and Adults), determinants of PA, aerobic fitness, and body composition. Follow-up measurements were performed immediately after the 3-month intervention and at 8-months, 5 months after the end of the 3-month intervention period.


RESULTS
A total of 102 workers, 23 to 39 years old, completed the baseline measurement at the worksite. 48 completed the 3-month follow up and 38 the 8-month follow-up in the intervention group, 50 completed the 3-month follow up and 42 the 8-month follow up in the control group. 35 out of 48 (73%) participants in the PAM intervention group reported wearing the PAM regularly, and the PAM COACH was used almost once a week; 24 out of 46 (52%) PAM users set a personal goal, and 33 (72%) entered their favorite activities on the website. Main reasons for not using these items were lack of interest or not being able to find the item on the website. The majority of PAM users (34 out of 46, 74%) read the advice, of whom 14 (39%) found it unappealing. After the 3-month intervention, no significant intervention effect was observed (adjusted difference in min/week) for sedentary behavior (beta = 10, 95% CI = -435 to 455), light-intensity PA (beta = -129, 95% CI = -337 to 79), moderate-intensity PA (beta = -13, 95% CI = -89 to 63), vigorous-intensity PA (beta= -6, 95% CI = -75 to 62), and moderate- to vigorous-intensity PA (beta = -23, 95% CI = -121 to 76). No significant intervention effect was observed in the PA outcomes at the 8-month follow-up. For the determinants of PA, aerobic fitness, and body composition, no statistically significant intervention effect was observed in the total study population immediately after the 3-month intervention or the 8-month follow-up.


CONCLUSIONS
The intervention appeared to be easily applicable to real-life settings. The intervention was ineffective in improving PA behavior or its determinants in healthy office workers. More attention should have been given to the quality and appropriateness of the tailored advice.


BACKGROUND
International Standard Randomized Controlled Trial Number (ISRCTN): 93896459; http://www.controlled-trials.com/ISRCTN93896459/ (Archived by WebCite at http://www.webcitation.org/5iR3mf7ex).
Slootmaker
Sander M
SM
EMGO Institute, Department of Public and Occupational Health, Body@Work Research Center Physical Activity, TNO-VU University Medical Center, Work and Health, Amsterdam, the Netherlands.
Chinapaw
Mai J M
MJ
Schuit
Albertine J
AJ
Seidell
Jacob C
JC
Van Mechelen
Willem
W
D000293:Adolescent; D000328:Adult; D003194:Computer-Assisted Instruction / Q000379:methods*; D015444:Exercise; D005240:Feasibility Studies; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D020407:Internet; D008019:Life Style; D008297:Male; D008991:Monitoring, Physiologic / Q000379:methods / Q000523:psychology; D009043:Motor Activity / Q000502:physiology; D009426:Netherlands; D009862:Online Systems / Q000592:standards*; D010174:Pamphlets; D010809:Physical Fitness; D012420:Running; D011795:Surveys and Questionnaires
Med Sci Sports Exerc. 2005 Nov;37(11 Suppl):S531-43
16294116
Am J Prev Med. 2007 Oct;33(4):336-345
17888860
Prev Med. 2004 Dec;39(6):1215-22
15539058
Br J Nutr. 1974 Jul;32(1):77-97
4843734
Patient Educ Couns. 1999 Feb;36(2):99-105
10223015
Med Sci Sports Exerc. 2005 Apr;37(4):676-83
15809569
Med Sci Sports Exerc. 2007 Aug;39(8):1423-34
17762377
J Behav Med. 1994 Dec;17(6):589-604
7739032
Am J Prev Med. 2003 Aug;25(2):140-3
12880882
Sports Med. 1991 Jun;11(6):358-66
1925183
JAMA. 2001 Mar 7;285(9):1172-7
11231746
BMC Public Health. 2005 Dec 15;5:134
16356182
Ann Behav Med. 2006 Jun;31(3):205-23
16700634
Prev Med. 1987 Nov;16(6):825-36
3432232
Prev Med. 2008 May;46(5):431-8
18207228
Am J Prev Med. 2007 Jul;33(1):54-64
17572313
J Med Internet Res. 2007 Sep 30;9(3):e26
17942388
Int J Epidemiol. 1992 Apr;21(2):305-10
1428485
Diabetes Care. 2001 Aug;24(8):1328-34
11473065
Patient Educ Couns. 1999 Feb;36(2):145-56
10223019
Health Promot Int. 2001 Dec;16(4):305-14
11733449
Percept Mot Skills. 2005 Feb;100(1):61-8
15773694
Scand J Med Sci Sports. 2009 Feb;19(1):36-43
18266793
Int J Behav Nutr Phys Act. 2007 Nov 16;4:59
18021411
Int J Obes Relat Metab Disord. 2004 Jan;28(1):113-9
14569279
WMJ. 2003;102(4):31-6
12967019
J Med Internet Res. 2007 Apr 27;9(2):e7
17478409
Am J Public Health. 2005 Oct;95(10):1825-31
16186461
MMWR Morb Mortal Wkly Rep. 2005 Dec 2;54(47):1208-12
16319815
Br J Sports Med. 2004 Apr;38(2):197-205
15039259
Ann Behav Med. 1999 Fall;21(4):290-8
10721435
Med Sci Sports Exerc. 1992 Jun;24(6 Suppl):S221-36
1625548