Core Stability vs. Traditional Physical Therapy: A Comparative Study on Alleviating Low Back Pain in Dysmenorrhea

Core Stability vs. Traditional Therapy: A Comparative Study on Alleviating Low Back Pain in Dysmenorrhea Dysmenorrhea is a menstrual disorder defined by the presence of painful cramps of uterine origin that occur during menstruation. It is one of the most common causes of pelvic pain and short-term absenteeism from school or work, among young and adult women \[1\].

The prevalence of Primary dysmenorrhea is highest in the 16-25-year age group but is greatly underestimated as many women consider pain a normal part of the menstrual cycle and do not seek medical treatment, despite the considerable distress they experience. A previous systematic review on the impact of dysmenorrhea in adolescents reported that the prevalence is high and that it imposes a significant negative impact on academic performance \[2\], restrictions on daily activities and sports or social and sexual relationships \[3\].

Primary dysmenorrhea occurs in the absence of pelvic pathology, it is mediated by elevated prostaglandin and leukotriene levels, inflammation causing uterine contractility and cramping pain. Secondary dysmenorrhea is due to pelvic pathology or a recognized medical condition and accounts for about 10% of cases of dysmenorrhea. The most common etiology of secondary dysmenorrhea is endometriosis, other etiologies include congenital or acquired obstructive and nonobstructive anatomic abnormalities (e.g., müllerian malformations, uterine leiomyomas, adenomyosis), pelvic masses, and infection \[4\].

It has been demonstrated that prostaglandins are overproduced in dysmenorrhea. Prostaglandins cause narrowing of the blood vessels supplying the uterus, abnormal contractile activity of the uterus, which leads to ischemia, hypoxia of the uterus and increased sensitivity of the nerve endings \[5\].

The treatment approach is mainly directed toward relieving the pain through physiological mechanisms that underlie menstrual pain (production of prostaglandins). The treatment is also aimed toward the improvement of the function, leading to fewer days lost at work, school or extracurricular activities \[6\]. There are different approaches to the treatment of primary dysmenorrhea. The drug approach is achieved through prostaglandins inhibitors, which are non-steroidal anti-inflammatory drugs (NSAIDs) and hormonal drugs such as contraceptives. Many NSAIDs which non-specifically inhibit both COX-1 and COX-2 enzymes (e.g., ibuprofen) are the most common initial therapy for dysmenorrhea \[7\]. Likewise, oral contraceptives are not free from side effects either, related as they are to the frequency of bleeding, weight gain, or the patient's basal risk of venous thromboembolism \[1\].

All this shows us that there is a need for emphasis on alternative methods of conservative treatment as a non-pharmacological and non-invasive therapy, safe and easy to use for obtaining relief from dysmenorrhea symptoms, including acupuncture and acupressure, biofeedback, heat treatments, transcutaneous electrical nerve stimulation (TENS), exercises and relaxation techniques \[8\]. On the other hand, these physiotherapeutic treatments, being supported by clinical trial data, could be a very useful treatment alternative for women with primary dysmenorrhea, particularly those who are not eligible for pharmacological therapy, since physiotherapy has no side effects according to the analyzed studies \[9\]. Exercise is an activity performed to develop or maintain fitness which requires physical exertion, is one of the non-pharmacological and effective ways of treating dysmenorrhea. Many reviews have evaluated the efficacy of exercise or individual physiotherapy interventions for primary dysmenorrhea \[10\].

Alternative or non-pharmacological treatments include TENS, exercise, acupuncture, acupressure, massage therapy, heat pads. The reduction of pain maybe due to the effect's hormonal changes in the uterine tissue or due to an increase in the endorphin levels \[11\].

Core muscle strengthening focuses on isolated muscle group conditioning which will strengthen the small intrinsic musculature around the lumbar spine and provide lumbar stability. When these muscles are strong, they become capable of handling normal biomechanical forces even the stress of menstrual cramps which a women's body undergoes during the menstrual cycle (12).

Core stability exercise has been known as a beneficial intervention in the management of several medical problems. Core stability exercises strengthen and coordinate the muscles around the abdominal, lumbar, and pelvic regions. Because it has been suggested that the core stability exercises mainly affect the lumbosacral muscles and increase blood supply in lumbosacral structures.

It was proved in some studies that core stability exercises can improve pain and function for primary dysmenorrhea in young and adult women. (13,14) but the number of studies about this were limited with many limitations so, we hypothesized that the core stability exercises might be effective in reducing primary dysmenorrhea symptoms.

So, this study was designed to compare among the effect of core stability in relation to traditional treatment of primary dysmenorrhea.

Subjects and methods This study is a randomized controlled study. All procedures used in the study will be compliant with the Declaration of Helsinki, which regulates research involving human subjects. Registration Clinical Trial Registration database (?) and approval from the Faculty of Physical Therapy, Delta University's institutional review board (No: ?). This study was carried out at outpatient clinic at faculty of physical therapy, delta university for science and technology, Egypt. The registration and recruitment of individuals and follow-up procedures were done from November 2024 to March 2025.

Subjects:

The patients will be included in this study had these criteria: Females diagnosed with primary dysmenorrhea between age group 18-35 years and their VAS Score is 4 ≥, regular menstrual cycle, unmarried females, non-athlete.

The exclusion criteria: history of pelvic inflammatory disease, endometriosis, any pathology, compulsory use of special drugs, had symptoms such as (tingling, itching, discharge), Irregular menstruation cycle, use of painkillers during the study period, any musculoskeletal problems causing inability to perform core strengthening exercises, mental, psychological problems.

Sample size A convenient sample of 80 participants will be screened for study eligibility. The sample size was calculated utilizing G\*Power based on a prior study with an effect size of 0.8. to detect a true difference in means with 80% power and a 5% significance level. An estimated sample size of 70 patients will be randomly allocated to a software application. Group A will receive core stability exercises combined traditional physical therapy (stretching exercises and TENS). The 2nd group (group B) will receive traditional physical therapy (stretching exercises and TENS) only.

Randomization Informed consent will be attained from each individual after explanation of the aim as well as benefits of the study. Individuals were informed about the privacy of their information and their right to stop or withdraw at any time. They will be randomized using the randomization block method into two groups, study (n=35) and control (n=35) groups. Allocation sequence will be applied by a blinded and independent research assistant who opened sealed envelopes containing a computer-generated randomized number.

Assessment procedures:

The assessors who participated in this study will be blinded to the patients' allocation in the studied groups. The outcome measures of this study were evaluated by one physiotherapist with an experience of more than 10 years in musculoskeletal and neurological conditions. Evaluating the pain severity \& functional quality of life and core stability measures were conducted for all patients before commencing the treatment and immediately after completing the treatment period of 4 weeks in the following order:

1. Pain severity for lumbar region:

We will use Visual Analogue Scale (VAS) which is a reliable and effective tool of pain intensity that is sensitive to variations in pain caused by clinical conditions, was used to assess the severity of the pain. At the scale's left end, a zero means there is no pain, and a 10 means the most agonizing suffering possible. A minor improvement with a change of 1.1-1.2 cm is clinically meaningful. (15) 2. Arabic oswestry disability index AODI assessment:

Patients will complete a questionnaire, which indicates a percentage score of level of function in daily living activities in pre-sessions and after end of sessions. This questionnaire examines levels of function every day in ten daily living activities. The categories will be scored from zero to five (10 categories). If all 10 sectors are finished the result is calculated as follows: if 20 the total result out of 50 total possible, score x 100 = 40%. (14) We recorded the results of this scale before and after the study. (15) 3. WaLIDD score:

It is a scale-type survey and abbreviation of (working ability, location, intensity, days of pain, dysmenorrhea), score: 0 without dysmenorrhea, 1-4 mild dysmenorrhea, 5-7 moderate dysmenorrhea, 8-12 severe dysmenorrhea. Wong-Baker scale was reclassified to adjust a four-level scale. We recorded the results of this scale before and after the study. (18) We will record the results of this scale before and after the study. 4. Core stability endurance test:

They are three core endurance tests generated by McGgill. (19) they are trunk flexor test, trunk extensor test and side bridge test. The trunk flexor test was performed while the body was 60° in flexion, knees and hip were 90° in flexion. The arms were joined diagonally on the chest. Participants were wanted to protect this position as long as it is possible. The test was terminated when the individual could not maintain this position. The trunk extensor test was performed on the treatment table in a prone position. Pelvis, hip and knees were fixed to the treatment table up to spina iliaca anterior superior level. The body and upper extremities were supported with a chair at the same height as the surface of the table. Then the chair was removed and the individual tried to keep the horizontal body position as long as possible while crossing the arms on the chest. The test was terminated when the person fell below the horizontal position. The side bridge test was performed on the dominant side on the mat. Because no difference between the left and right side has been previously reported, only the dominant side was evaluated (12). Knees of the participants were on the extensions with same line of feet. Body weight was supported only by the lower elbows and feet while lifting her hips on the mat. The test was terminated when the side-lying position deteriorated and the hip fell. The measurement results of McGill endurance test recorded in seconds.

Intervention procedures:

Core stability exercises (CSE): Subjects in this group will be handled with core stability exercises that targeted deep abdominal muscles. This included a series of exercises as well as a baseline therapeutic management of ultrasonic as well as TENS. A physiotherapist supervised these exercises.

For four weeks, all groups did core stability exercises for 30 minutes three times per week. Isometric contraction was sustained for 7-8 seconds for every exercise. Each exercise was repeated ten times, with a three-second rest break among repetitions. Patients were given a 1-minute break between exercises. (13) Based on the patient's success, the intensity of the individual training steadily increased with decreasing therapist support. Patients were told to contract their abdominal muscles and hold the contraction while continuing to breathe normally during each repetition of each exercise.