Menzies Institute for Medical Research, University of Tasmania, 17 Liverpool St, Hobart, Tasmania, 7000, Australia.
Baker Heart and Diabetes Institute, Melbourne, Australia.
Int J Behav Nutr Phys Act. 2024 Aug 19;21(1):91. doi: 10.1186/s12966-024-01633-3.
Greater public transport use has been linked to higher physical activity levels. However, neither the amount of physical activity associated with each daily public transport trip performed, nor the potential total physical activity gain associated with an increase in trips/day, has been determined. Using objective measures, we aimed to quantify the association between public transport use, physical activity and sedentary time.
A longitudinal study of Australian adults living in Hobart, Tasmania, who were infrequent bus users (≥ 18 years; used bus ≤ 2 times/week). The number of bus trips performed each day was determined from objective smartcard data provided by the public transportation (bus) provider across a 36-week study timeframe. Accelerometer measured steps/day (primary outcome), moderate-to-vigorous physical activity (min/day), and sedentary time (min/day) were assessed across four separate one-week periods.
Among 73 participants across 1483 day-level observations, on days that public transport was used, participants achieved significantly more steps (β = 2147.48; 95%CI = 1465.94, 2829.03), moderate to vigorous physical activity (β = 22.79; 95% CI = 14.33, 31.26), and sedentary time (β = 37.00; 95% CI = 19.80, 54.21) compared to days where no public transport trips were made. The largest increase in steps per day associated with a one-trip increase was observed when the number of trips performed each day increased from zero to one (β = 1761.63; 95%CI = 821.38, 2701.87). The increase in the number of steps per day was smaller and non-significant when the number of trips performed increased from one to two (β = 596.93; 95%CI=-585.16, 1779.01), and two to three or more (β = 632.39; 95%CI=-1331.45, 2596.24) trips per day. Significant increases in sedentary time were observed when the number of trips performed increased from zero to one (β = 39.38; 95%CI = 14.38, 64.39) and one to two (β = 48.76; 95%CI = 25.39, 72.12); but not when bus trips increased from two to three or more (β=-27.81; 95%CI=-76.00, 20.37).
Greater public transport use was associated with higher physical activity and sedentary behaviour. Bus use may yield cumulative increases in steps that amount to 15-30% of the daily recommended physical activity target. A policy and public health focus on intersectoral action to promote public transport may yield meaningful increases in physical activity and subsequent health benefits.
更多地使用公共交通工具与更高的身体活动水平有关。然而，每天进行的每一次公共交通旅行所对应的身体活动量，以及每天增加的公共交通旅行次数可能带来的总身体活动量增益，都尚未确定。本研究使用客观测量方法，旨在定量评估公共交通使用、身体活动和久坐时间之间的关联。
这是一项在塔斯马尼亚州霍巴特生活的澳大利亚成年人的纵向研究，他们很少乘坐公交车（≥18 岁；每周乘坐公交车≤2 次）。在 36 周的研究时间内，从公共交通（公交车）提供商提供的智能卡数据中确定每天乘坐的公交车次数。使用加速度计在四个不同的一周期间分别评估每天的步数（主要结果）、中等到剧烈的身体活动（分钟/天）和久坐时间（分钟/天）。
在 1483 天的观测中，73 名参与者中，在使用公共交通工具的日子里，与没有乘坐公共交通工具的日子相比，参与者的步数（β=2147.48；95%CI=1465.94, 2829.03）、中等到剧烈的身体活动（β=22.79；95%CI=14.33, 31.26）和久坐时间（β=37.00；95%CI=19.80, 54.21）明显更多。与每天零次公共交通旅行相比，每天一次公共交通旅行的次数增加与每天增加的步数最多相关（β=1761.63；95%CI=821.38, 2701.87）。当每天的旅行次数从一次增加到两次或更多时（β=632.39；95%CI=-1331.45, 2596.24），每天的步数增加较小且不显著。当每天的旅行次数从一次增加到两次或更多时，每天的步数增加较小且不显著（β=596.93；95%CI=-585.16, 1779.01），每天的旅行次数从两次增加到三次或更多（β=632.39；95%CI=-1331.45, 2596.24）。当每天的旅行次数从零增加到一次（β=39.38；95%CI=14.38, 64.39）和一次增加到两次（β=48.76；95%CI=25.39, 72.12）时，观察到久坐时间显著增加；但当每天的公共交通旅行次数从两次增加到三次或更多时（β=-27.81；95%CI=-76.00, 20.37），则没有增加。
更多地使用公共交通工具与更高的身体活动和久坐行为有关。乘坐公共汽车可能会使每天的推荐身体活动目标增加 15-30%。政策和公共卫生部门关注跨部门行动，以促进公共交通的使用，可能会带来更有意义的身体活动增加和随后的健康益处。
