VALIDITY AND RELIABILITY OF EXERCISE MEASURES DURING PREGNANCY

本子项目是利用由NIH/NCRR资助的中心赠款提供的资源的众多研究子项目之一。子项目和研究者（PI）可能已经从另一个NIH来源获得了主要资金，因此可以在其他CRISP条目中表示。列出的机构是中心的，不一定是研究者的机构。研究目的：在美国，不良妊娠结局的普遍存在引起公众健康关注。例如，大约10%的新生儿体重过轻，11%的出生结果导致妊娠期少于37周（即早产；国家卫生统计中心，1998年）。由于低出生体重和早产与负面健康后果有关，因此降低其流行率是2010年健康人目标的一部分。然而，研究身体活动对出生结果的影响是模棱两可的（Leiferman & Evenson, 2003）。造成结果不一致的一个潜在原因是体育活动评估缺乏一致性。关于体力活动和不良妊娠结果的研究是有限的，现有的研究大多依赖于非标准化的自我报告测量。很少有研究考察这种与客观监测设备的关系。检查身体活动是否可以降低不良妊娠结果的可能性很重要，因为它可以提供一种具有成本效益和可修改的方式来降低这种风险（Leiferman & Evenson, 2003）。然而，在研究能够有效地检验身体活动在减少不良出生结果中的作用之前，需要更多的研究来检验怀孕期间身体活动测量的有效性和可靠性。明确目标#1。我们将检验在怀孕期间评估的客观监测（加速度计、计步器）和自我报告工具的收敛效度（相同结构的测量之间的相关性）。根据先前的研究（Freedson & Miller, 2000; Stein et al., 2003），假设加速度计与其他运动测量相比将产生最高的效度系数。具体目标2。我们将研究怀孕期间进行的身体活动评估与低出生体重和早产之间的关系。根据以往研究人员的结论（如Campbell & Mottola, 2001; Hatch et al., 1998），假设体育活动与低出生体重和早产有关。

This subproject is one of many research subprojects utilizing the resources provided by a Center grant funded by NIH/NCRR. The subproject and investigator (PI) may have received primary funding from another NIH source, and thus could be represented in other CRISP entries. The institution listed is for the Center, which is not necessarily the institution for the investigator. Purpose of Study: A public health concern exists regarding the prevalence of adverse pregnancy outcomes in the United States. For example, approximately 10% of births are of low weight and 11% of birth outcomes end with a preterm gestational period of less than 37 weeks (i.e., preterm delivery; NCHS, 1998). Because low birth weight and preterm birth are associated with negative health consequences, reducing their prevalence is part of the Healthy People 2010 objectives. Research, however, examining the effect of physical activity on birth outcomes is equivocal (Leiferman & Evenson, 2003). One potential reason for the discrepant results is the lack of consistency in physical activity assessments. The research examining physical activity and adverse pregnancy outcomes is limited, and the existing studies have relied on mostly nonstandardized self-report measures. Few, if any, studies have examined this relationship with objective monitoring devices. Examining whether physical activity may reduce the likelihood of adverse pregnancy outcomes is important because it could provide a cost-effective and modifiable way to reduce this risk (Leiferman & Evenson, 2003). However, before research can effectively examine the role of physical activity in reducing poor birth outcomes - more research is warranted examining the validity and reliability of physical activity measures during pregnancy. Specific Aim #1. We will examine the convergent validity (correlation between measures of the same construct) of objective monitoring (accelerometer, pedometer) and self-report instruments assessed during pregnancy. Based on previous research (Freedson & Miller, 2000; Stein et al., 2003) it is hypothesized that the accelerometer will generate the highest validity coefficients compared to the other exercise measures. Specific Aim #2. We will examine the association between the physical activity assessments taken during pregnancy and low birth weight and preterm delivery. Based on the conclusions of previous researchers (e.g., Campbell & Mottola, 2001; Hatch et al., 1998), it is hypothesized that physical activity will be associated with low birth weight and preterm delivery.