In search of lost time: When people undertake a new exercise program, where does the time come from? A randomized controlled trial. Issue 1 (January 2015)

• Record Type: Journal Article
• Authors: Gomersall, Sjaan R.; Norton, Kevin; Maher, Carol; English, Coralie; Olds, Tim S.
• Is Part Of: Journal of science and medicine in sport. Volume 18:Issue 1(2015:Jan.)
• Page Start: 43
• Page End: 48
• Publication Date: 2015-01
• Subjects: Sports sciences -- Periodicals; Sports medicine -- Periodicals; Exercise -- Physiological aspects -- Periodicals; Sports -- physiology -- Periodicals; Sports Medicine -- Periodicals; Sportgeneeskunde; 617.102705
• DOI: 10.1016/j.jsams.2014.01.004
• Languages: English
• ISSNs: 1440-2440

Abstract

<abstract abstract-type="author" id="abs0005"> <title id="sect0005">Abstract</title> <sec> <title id="sect0010">Objectives</title> <p id="spar0005">The objective of this study was to investigate changes in use of time when undertaking a structured exercise program.</p> </sec> <sec> <title id="sect0015">Design</title> <p id="spar0010">This study used a randomized, multi-arm, controlled trial design.</p> </sec> <sec> <title id="sect0020">Methods</title> <p id="spar0015">A total of 129 insufficiently active adults aged 18–60 years were recruited and randomly allocated to one of three groups, a <italic>Moderate</italic> or <italic>Extensive</italic> six-week exercise group (150 and 300 additional minutes of exercise per week, respectively) or a <italic>Control</italic> group. Prescribed exercise was accumulated through both group and individual sessions. Use of time was measured at baseline and end-program using the Multimedia Activity Recall for Children and Adults, a computerized 24-h recall instrument. Daily minutes of activity in activity domains and energy expenditure zones were determined.</p> </sec> <sec> <title id="sect0025">Results</title> <p id="spar0020">Relative to changes in the control group, daily time spent in the physical activity [<italic>F</italic> (2, 108) = 20.21, <italic>p</italic> < 0.001] and Active Transport [<italic>F</italic> (2, 108) = 3.71, <italic>p</italic> = 0.03] time use domains significantly increased in the intervention groups by 21–45 min/day. Comparatively, the intervention groups spent significantly less time watching television [<italic>F</italic> (2, 108) = 5.02, <italic>p</italic> = 0.008; −50–52 min/day], relative to Controls. Additionally, time spent in the moderate to vigorous energy expenditure zone had significantly increased in the intervention groups by end-program [<italic>F</italic> (2, 108) = 6.35, <italic>p</italic> = 0.002; 48–50 min/day], relative to Controls.</p> </sec> <sec> <title id="sect0030">Conclusions</title> <p id="spar0025">This study is the first to comprehensively map changes in time use across an exercise program. The results suggest that exercise interventions should be mindful not only of compliance but also of "isotemporal displacement" of behaviors.</p> </sec> </abstract>