Muscle Cramps in Hemodialysis Patients: A Randomized Controlled Trial

Method Study Design and Setting This study will be conducted using a quasi-experimental design to evaluate the effects of foot massage and progressive muscle relaxation exercises (PMRE) on muscle cramps in hemodialysis patients. The study will take place at the hemodialysis center of Istanbul Gaziosmanpasa Training and Research Hospital between February and August 2025.

Population and Sample The study population consists of all hemodialysis patients registered at the study center, while the sample will include voluntary hemodialysis patients with similar demographic characteristics and dialysis treatment methods who meet the study criteria. Since no identical study exists in the literature, a power analysis was conducted to determine the sample size required to show a significant difference in the reduction of the mean number of cramps (effect size = 1), with 80% power and a 5% Type I error rate. Accordingly, 30 patients per group (massage group, PMRE group, and control group), totaling 90 patients, were planned for inclusion in the study.

Inclusion criteria:

Aged 18 years and older Receiving chronic hemodialysis treatment Experiencing muscle cramps in the last three months No physical or mental health conditions preventing communication

Exclusion criteria:

Presence of acute health issues requiring additional pharmacological treatment Inability to complete PMRE or massage applications Randomization Patients who meet the inclusion criteria and provide consent will undergo an initial interview conducted by the primary researcher, during which baseline data will be collected. Patients will be stratified based on dialysis session frequency, cramp frequency, age, and gender. To ensure homogeneity, patients will be asked about the frequency and severity of cramps experienced in the previous week. Based on the mean cramp frequency and severity scores obtained, hemodialysis patients will be categorized accordingly. Group assignments will be determined using simple randomization via an online tool (www.randomizer.org).

Data Collection Tools Demographic Information Form: Designed to collect participants' demographic and clinical characteristics.

Muscle Cramp Severity and Frequency Scale: This tool will assess the frequency and severity of muscle cramps. Developed based on a literature review, the scale records the date and frequency of cramps. Cramp episodes are defined according to the literature as involuntary leg movements lasting longer than one minute in hemodialysis patients. The number of episodes experienced during each dialysis session will be recorded.

Renal Function Tests: Parameters such as serum creatinine and urea levels will be evaluated.

Chronometer: A calibrated chronometer will be used to measure cramp duration, recorded in minutes.

Interventions Foot Massage Application: Participants will receive a 20-minute foot massage. The massage will be applied during dialysis treatment using techniques that support circulation to enhance tissue oxygenation and remove metabolic waste.

Foot Massage Protocol Before starting, the feet will be evaluated. Then, the feet will be cleaned with a wet compress and dried before proceeding with the massage. The total duration will be 20 minutes, with 10 minutes per foot. The massage will include five manipulation techniques: effleurage, petrissage, friction, percussion, and vibration, with only effleurage, petrissage, and friction used in this study.

Effleurage (Stroking): A light stroking movement over the skin. The massage starts and ends with effleurage, applying minimal pressure with the whole palm in a slow and steady motion using one or both hands. The fingers, except the thumbs, remain close together. Effleurage lasts approximately 2 minutes.

Petrissage (Kneading): The foot is kneaded by compressing and releasing it with both hands. This technique lasts around 3 minutes.

Friction: Circular and elliptical pressing and gliding movements are applied with the fingertips, from the sole to the dorsum of the foot, using varying pressures. This technique is performed for 5 minutes using the fingertips of the index or middle finger. The movement progresses towards the heart in small circular motions while applying adequate pressure.

Progressive Muscle Relaxation Exercises (PMRE): A 20-minute PMRE session will be conducted by the researcher. Participants will systematically tense and relax muscle groups throughout their bodies while undergoing dialysis treatment.

Progressive Muscle Relaxation Protocol

Before starting, participants will be given detailed information about the process. The exercises will focus on major muscle groups and follow these steps:

Foot Muscles: The foot muscles will be tensed for 5 seconds and then relaxed. Leg Muscles: The calf and thigh muscles will be stretched and relaxed in various positions.

Arm and Shoulder Muscles: The arms will be stretched forward and sideways, relaxing the muscles with active and passive relaxation movements.

Face and Neck Muscles: The forehead, jaw, and neck muscles will be tensed and then relaxed.

Duration and Repetitions: Each movement will involve 5-10 seconds of tension and 10-15 seconds of relaxation, with the entire protocol lasting approximately 20 minutes.

Completion: The session will conclude with deep breathing and relaxation exercises.

Both interventions will be applied twice a week for three weeks.

Control Group Participants in the control group will receive only routine hemodialysis treatment. They will not be exposed to any additional interventions during the data collection process.

Data Collection and Evaluation Study data will be collected at two time points: before the intervention (Day 1) and after the intervention (at the end of the 3rd week). The severity and frequency of muscle cramps will be assessed using the demographic information form and muscle cramp assessment scale. Blood tests will be conducted to measure serum creatinine and urea levels.