This semi-experimental study with two control and intervention groups with pre-test and post-test stages on pregnant mothers referred to the health centers of Sabzevar University of Medical Sciences in a simple random fashion based on permutation blocks based on a similar study (
21) and considering Taking the confidence level of 95% and the test power of 90%, and using the following formula; the sample size was calculated to be 104 people. Considering the possibility of dropping out, the sample size was 116 people
Fifty-eight people were considered for the control group and 58 people for the intervention group. The criteria for entering the study are 20 - 24 weeks gestational age, non-pathological back, chest, and back pain, the maximum number of pregnancies 2 times, age between 18 and 35 years and singleton pregnancy, no underlying disease or fetal abnormality, no Uterine bleeding, no history of orthopedic diseases, back pain, pathological chest, and back pain before and during pregnancy, no history of accidents that caused skeletal-muscular problems, no history of congenital skeletal-muscular problems, having minimal literacy, not losing one's job or spouse during pregnancy, the absence of death of relatives, and the criteria for withdrawing from the study: Refusal to participate in educational programs, the occurrence of disease (blood pressure, diabetes, etc.) and known complications of pregnancy (polyhydramnios, oligohydramnios, known fetal abnormality, intrauterine death of the fetus, etc.) abnormal bleedings included placenta previa, dekalman, death of relatives, loss of spouse's job. In order to carry out work and training more effectively and based on the working group rules, the intervention group people were divided into groups of 8 to 12 people for training. To collect data from two demographic questionnaires including information (age, weight, height, education, occupation, employment history, employment status, gestational age, number of deliveries, age of the last child at delivery, type of delivery method, type of anesthesia, performed exercise and exercise time), and the body map questionnaire, which plays a role in recognizing body areas involved in musculoskeletal disorders, and it is one of the most reliable questionnaires in the field of ergonomics and has a favorable application in ergonomic evaluations. Its validity and reliability have also been calculated (
22). Then, in the intervention group, three 1-hour training sessions were conducted. The first session started with welcoming and introducing the members. Then, the people were asked to perform daily and repetitive activities, and their activities (such as sitting, standing, lifting, picking up objects, clothing, and type of shoes) were evaluated by the senior ergonomic design colleague without the people's knowledge. The questionnaire was completed, and the training was multimedia using PowerPoint, practical demonstration, group discussion, pamphlets, and educational CDs. Thus, in the first session, educational materials, including physiological and anatomical changes during pregnancy and common complaints during pregnancy, were explained using PowerPoint and group discussion. In the second session, the contents of the previous session were first reviewed, and the correct postures, including how to get up from the floor, standing for long periods and washing dishes, ironing, sitting on the floor, sitting in a chair, sleeping, fastening the seat belt in the car, wearing clothes and shoes. Carrying heavy equipment with a slide was also taught practically by the researcher. People were asked to implement these situations in a practical way. Each person individually performed all the situations under the supervision of the researcher and the assistant of the researcher to ensure the accuracy of their performance; correct pregnancy breathing techniques were also taught in a simple way, including deep, chest, abdominal, and conscious breathing, calm and regulated breathing, and patterned breathing. In the end, illustrated pamphlets were given to the members for more practice at home. In the third session, the previous materials were reviewed. People are asked to repeat the correct activities. In this session, strength and stretching techniques were taught, followed by correct pregnancy breathing techniques and their combination with movements and activities. Finally, the questions were answered. Since continuous attendance is difficult for the group, and to strengthen self-care, people are given training CDs and exercises are continued at home, and follow-ups are done in the center's care for the correct performance of activities. Also, weekly counseling and follow-up on the use of pieces of training and clarification of ambiguities were done over the phone, and if a repeat visit was needed, the researcher made an appointment with the pregnant woman in the care center and answered the questions. After dividing into groups, the control group completed the questionnaire and received the center's routine care; in the 36th week, the questionnaires were completed again in 2 groups. Other questions required after delivery were completed from the file. After collecting the data, the information was entered into SPSS 18 software and analyzed using descriptive statistics, independent
t-test, paired samples
t-test, and ANOVA.