Barbosa J F deS, Bruno S S, Cruz N S O, de Oliveira J S, Ruaro J A, Guerra R O
Universidade Federal Rio Grande do Norte, Natal, Rio Grande do Norte, Brazil.
Department of Physiotherapy, Universidade Federal Rio Grande do Norte, Natal, Rio Grande do Norte, Brazil.
Physiotherapy. 2016 Sep;102(3):294-9. doi: 10.1016/j.physio.2015.08.008. Epub 2015 Sep 28.
To determine the relationship between perceived fatigability and oxygen consumption, carbon dioxide production, respiratory exchange ratio and the energy cost of walking in older women.
Observational, cross-sectional study.
Forty-eight community-dwelling older women were recruited from senior centres in Natal, Rio Grande do Norte, Brazil.
Participants were evaluated in two different sessions. In the first session, sociodemographic and clinical factors were assessed and accelerometers were delivered. In the second session, the 6-minute walking test (6MWT) was performed and expired gases were analysed. Self-reported levels of fatigue were evaluated on a numerical scale from 1 ('extremely energetic') to 7 ('extremely tired'). Severity scores for perceived and performance fatigability were calculated as the ratio of change in performance and fatigue, respectively, with walking distance. The O2 cost of walking was based on the oxygen consumption rate and the 6MWT walking speed.
No correlation was found between the severity of perceived fatigability and metabolic measures. However, the severity of perceived fatigability was significantly correlated with greater O2 cost (r=0.579, P<0.01), physical activity (r=-0.654, P<0.01), walking distance (r=-0.712, P<0.01) and severity of performance fatigability (r=0.690, P<0.01).
Perceived fatigability was not directly associated with metabolic measures; however, greater severity of perceived fatigability was associated with an increase in the O2 cost of walking. Important relationships were also found between greater severity of perceived fatigability and poor functional fitness, high level of energy expenditure and lower level of physical activity.
确定老年女性的主观疲劳感与耗氧量、二氧化碳产生量、呼吸交换率以及步行能量消耗之间的关系。
观察性横断面研究。
从巴西北里奥格兰德州纳塔尔的老年中心招募了48名居住在社区的老年女性。
参与者在两个不同的时间段接受评估。在第一个时间段，评估社会人口统计学和临床因素并发放加速度计。在第二个时间段，进行6分钟步行试验（6MWT）并分析呼出气体。通过从1（“精力极其充沛”）到7（“极其疲惫”）的数字量表评估自我报告的疲劳水平。主观疲劳感和表现性疲劳的严重程度评分分别计算为表现和疲劳随步行距离变化的比率。步行的氧气消耗基于耗氧率和6MWT步行速度。
未发现主观疲劳感的严重程度与代谢指标之间存在相关性。然而，主观疲劳感的严重程度与更高的氧气消耗（r = 0.579，P < 0.01）、身体活动（r = -0.654，P < 0.01）、步行距离（r = -0.712，P < 0.01）和表现性疲劳的严重程度（r = 0.690，P < 0.01）显著相关。
主观疲劳感与代谢指标没有直接关联；然而，主观疲劳感的更严重程度与步行氧气消耗的增加有关。还发现主观疲劳感的更严重程度与功能适应性差、高能量消耗水平和低身体活动水平之间存在重要关系。
