Phase Angle Reflects Loss of Functionality in Older Women.,The Journal of Nutrition, Health & Aging
OBJECTIVE This study verified if the phase angle (PA) formed by the resistance (R) and reactance (Xc) obtained from bioimpedance (BIA) might be a useful tool to identify functionality. DESIGN AND PARTICIPANTS It was conducted a cross-sectional study with 152 women ≥ 65 years old from the community. MEASUREMENTS weight, height, body mass index (BMI), calf circumference (CC), hand grip strength (HGS), gait speed (GS), fat free mass (FFM), body fat (BF), PA with R and Xc from the BIA were measured. Spearman's and Pearson's correlations and the odds ratio (OR) were performed using the IBM SPSS software version 22.0. RESULTS Sixty-four percent (n=98) women are with PA below the reference. Negative moderate significant correlation was found between PA and age (r =- 0.440*; p<0.001). Moderate significant correlation was observed between PA and GS (r = 0.484**; p<0.001). Weak significant correlation was found between PA and HGS (r = 0.177*; p = 0.029). Odds ratio (OR) demonstrated that individuals with PA above the mean value have 4.77 times more chances of having increased GS (confidence interval 2.40-9.48; 95%). Women aged below the mean value have 4.02 times more chances of having higher PA (confidence interval 2.02-7.99; 95%). Younger aged women showed 4.02 times more chances of having higher PA (confidence interval 2.02-7.99; 95%). CONCLUSIONS Phase angle can be associated with functional tests, such as gait speed and hand grip strength, in older women.
中文翻译：
相位角反映了老年女性功能的丧失。
目的 本研究验证从生物阻抗 (BIA) 获得的电阻 (R) 和电抗 (Xc) 形成的相角 (PA) 是否可能是识别功能的有用工具。设计和参与者 这是一项针对社区 152 名 65 岁以上女性的横断面研究。测量体重、身高、体重指数 (BMI)、小腿围 (CC)、握力 (HGS)、步态速度 (GS)、去脂质量 (FFM)、体脂 (BF)、PA，其中 R 和 Xc 来自测量了 BIA。 Spearman 和 Pearson 相关性和优势比 (OR) 使用 IBM SPSS 软件 22.0 版进行。结果 64% (n=98) 的女性 PA 低于参考值。 PA 与年龄之间存在负中度显着相关性 (r =- 0.440*; p<0.001)。 PA 和 GS 之间观察到中度显着相关性 (r = 0.484**；p<0.001)。 PA 和 HGS 之间存在微弱的显着相关性（r = 0.177*；p = 0.029）。比值比 (OR) 表明，PA 高于平均值的个体 GS 增加的机会增加 4.77 倍（置信区间 2.40-9.48；95%）。年龄低于平均值的女性拥有较高 PA 的机会是其 4.02 倍（置信区间 2.02-7.99；95%）。年轻女性获得较高 PA 的机会是其他女性的 4.02 倍（置信区间 2.02-7.99；95%）。结论 相位角可能与老年女性的功能测试相关，例如步态速度和握力。
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