The Relationship Between Healthy Lifestyle Behaviors, Physical Activity and Blood Tests in Pregnancy

Pregnancy is a phase in women's lives characterized by psychological, biological, and emotional changes. The process of pregnancy typically spans nine months, divided into three trimesters (Küçükkaya et al., 2018). Identifying risk factors during pregnancy is essential, and these include ethnicity, maternal age, gestational age, antibody presence, iodine sufficiency, parity (number of births), multiple pregnancies, body mass index, and smoking (Curí L.L. et al., 2023). Pregnancy is also linked to various factors that affect a woman's psychological health, family dynamics, and overall quality of life. Pregnant women must collaborate with a multidisciplinary team (doctors, midwives, nurses, physiotherapists, etc.) to manage these risks effectively (Amirshahi et al., 2024).

Pregnant women often experience anxiety about potential negative outcomes during labor and the postpartum period (Küçükkaya et al., 2018). Research indicates that women's concerns and anxieties change across different trimesters (Küçükkaya et al., 2018; Karataylı, S., 2007). Moreover, factors such as age, education level, employment status, and health insurance significantly influence their anxiety levels (Küçükkaya et al., 2018). These concerns-along with anxiety, depression, and stress-affect pregnancy-related responsibilities, nutrition, hygiene, physical activity, travel, and overall acceptance of pregnancy. Therefore, in our study, we plan to assess the healthy lifestyle behaviors of women in their first trimester using the "Pregnancy Healthy Lifestyle Behavior Scale" (Yılmaz E, Karahan N, 2019). This scale, developed by Yılmaz et al., consists of 29 items and 6 subscales (pregnancy responsibility, nutrition, hygiene, physical activity, travel, and pregnancy acceptance) and has undergone validity and reliability testing. It uses a five-point Likert scale, with higher scores indicating more positive health behaviors.

Regular physical activity during pregnancy maintains and improves physical fitness, aids in weight management, reduces the risk of gestational diabetes in obese women, and enhances psychological well-being. It is recommended that women engage in at least 20-30 minutes of moderate-intensity exercise most days of the week. Studies show that physical activity during pregnancy reduces negative outcomes for both the mother and fetus, positively affecting maternal and child health (American College of Obstetricians and Gynecologists, 2015). Physical activity has multiple benefits, including maintaining physical condition, improving quality of life, reducing the risk of obesity-related diseases, and increasing longevity. Generally, physical activity during pregnancy carries minimal risks and benefits most women, particularly those with uncomplicated pregnancies, who are encouraged to engage in personalized exercise programs before, during, and after pregnancy (American College of Obstetricians and Gynecologists, 2015). However, despite its proven benefits, studies have shown that many pregnant women do not engage in adequate physical activity (Göker et al., 2021). Research has found that women's total physical activity levels in the first trimester are lower compared to other trimesters (Lee et al., 2016). Another study shows that physical activity levels increase in the second trimester, with significant improvements noted compared to the first and third trimesters (Özdemir et al., 2017). This decrease in activity in the first trimester may be attributed to efforts to ensure fetal safety and physical discomfort caused by pregnancy (Ko Y-L et al., 2016). However, the pregnancy process is individualized, and some women may engage in regular physical activity even in early pregnancy. Therefore, our study aims to assess physical activity levels in the first trimester. This evaluation will help us understand the frequency of physical activity in early pregnancy and explore its potential effects on pregnancy health. To achieve this, we will use the "Pregnancy Physical Activity Questionnaire" (Chasan-Taber et al., 2004), validated in Turkish by Tosun et al. (2015). This questionnaire consists of 36 items divided into four subscales: occupational activity, household chores, child care, and exercise. The scores will assess the physical activity levels of pregnant women during the first trimester.

Pregnancy also affects thyroid function and can lead to various complications. Factors such as ethnicity, socio-economic status, iodine supplementation, and obesity influence Thyroid-Stimulating Hormone (TSH) levels. Monitoring trimester-specific TSH ranges is important for timely diagnosis and treatment (Yanachkova et al., 2024). Thyroid disorders are common during pregnancy, affecting 2-3% of all pregnancies, with 10% of women having autoimmune thyroid disease despite normal thyroid function. Over the past two decades, a better understanding of thyroid physiology during pregnancy has highlighted the importance of thyroid function adaptation and the negative maternal and neonatal outcomes associated with untreated thyroid disorders, such as hypothyroidism or hyperthyroidism. Increased awareness of thyroid diseases during pregnancy can help reduce complications (Tekin, Y. B., & Güven, E. S. D., 2014). In our study, we will evaluate TSH values during the first trimester.

In addition to thyroid issues, liver dysfunction during pregnancy can be a concern. Around 3% of pregnancies are affected by liver dysfunction (Ch'ng et al., 2002), which can range from mild functional disturbances to rare severe liver diseases. These issues often arise at specific stages of pregnancy. Proper diagnosis and timely treatment are critical for reducing morbidity and mortality risks for both mother and baby (Güven, S., & Türkay, C., 2011). Pregnancy-specific liver diseases can cause changes in liver enzymes such as ALT and AST, which are crucial for identifying complications. Therefore, we will examine ALT and AST levels as part of our study.