VALIDITY AND RELIABILITY OF EXERCISE MEASURES DURING PREGNANCY

这个子项目是许多研究子项目中利用 资源由NIH/NCRR资助的中心拨款提供。子项目和 调查员(PI)可能从NIH的另一个来源获得了主要资金， 并因此可以在其他清晰的条目中表示。列出的机构是 该中心不一定是调查人员的机构。 研究目的： 美国普遍存在不良妊娠结局，这是一个公共卫生问题。例如，大约10%的新生儿是低体重的，11%的新生儿结局是早产期不到37周(即，早产；NCHS，1998)。由于低出生体重和早产与负面健康后果相关，降低其患病率是2010年健康人目标的一部分。然而，检验体力活动对生育结果的影响的研究是模棱两可的(Leiferman&Evenson，2003)。结果不一致的一个潜在原因是体力活动评估缺乏一致性。检查体力活动和不良妊娠结局的研究是有限的，现有的研究大多依赖于非标准化的自我报告测量。很少有研究研究这种与客观监测设备的关系。检查体育锻炼是否可以降低不良妊娠结局的可能性是重要的，因为它可以提供一种经济有效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查体力活动在减少不良出生结局方面的作用之前，还需要更多的研究来检查怀孕期间体力活动措施的有效性和可靠性。 具体目标#1。我们将检验孕期评估的客观监测(加速计、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)。基于先前的研究(Freedson&Miller，2000；Stein等人，2003)，假设与其他运动测量方法相比，加速度计将产生最高的有效性系数。 具体目标2：我们将研究孕期体力活动评估与低出生体重和早产之间的关系。基于前人研究人员的结论(如Campbell&Mottola，2001；Hatch et al.，1998)，假设体力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.