Dose-Response Structured Calf Muscle Pump Activation Strategies Versus Unsupervised Home Walks

The research aims to determine whether a structured, dose-response regimen of calf muscle pump activation exercises, which are specifically designed and supervised to maximize venous return in the lower limbs, can enhance ulcer healing rates more effectively than the traditional recommendation of unsupervised home walking. Participants are divided into two groups: one receives guided interventions with tailored exercise frequency, duration, and intensity to systematically activate the calf muscle pump, while the control group is advised to perform regular home walks without supervision or specific guidance. The study meticulously measures healing outcomes, adherence, vascular function, and patient quality of life to assess the true impact of structured exercise versus informal activity. By analyzing these variables, the research seeks to provide evidence-based recommendations for optimizing therapeutic strategies in the management of venous leg ulcers, potentially shifting clinical practice toward more prescriptive and individualized physical activity guidelines, and highlighting the importance of targeted exercise science in post-secondary physical education and rehabilitation curricula.

Weeks 1-4 (Activation Phase): Focuses on establishing baseline mobility. Weeks 5-8 (Hypertrophy \& Ejection Phase): Focuses on building muscle pump volume.

Weeks 9-12 (Power \& Hemodynamic Clearance Phase): Focuses on clearing pooled blood under high pressure.

Other: Dose-Response Structured CMP Activation

Completely independent and self-managed home program

Other: Active Control

Progression Protocol (The Dose-Response) Weeks 1-4 (Activation Phase): Focuses on establishing baseline mobility. Ankle ROM Drills: 3 sets of 15 repetitions of passive and active dorsiflexion/plantar flexion stretches utilizing an inelastic stretching strap. Goal: Overcome joint stiffness to reach \>10° of passive dorsiflexion. Seated CMP Loading: Seated heel raises with resistive elastic bands (15 repetitions, 4 sets).

Weeks 5-8 (Hypertrophy \& Ejection Phase): Focuses on building muscle pump volume.

Standing Closed-Kinetic Chain Exercises: Standing bodyweight heel raises performed on a step to allow a deep negative heel deficit (eccentric loading). 4 sets of 12 repetitions. Incline Ergometry: 15 minutes of continuous stationary cycling or treadmill walking at a 5% to 8% incline to force a natural heel-strike and powerful toe-off phase.

Weeks 9-12 (Power \& Hemodynamic Clearance Phase): Focuses on clearing pooled blood under high pressure.

Resisted Plantarflexion: Single-leg standing hee

Patients were issued a medical-grade wrist-worn pedometer and a matching ankle sensor. The device display was blinded (blacked out) to prevent active self-biasing or behavioral modification based on step count numbers. Data was downloaded retroactively by researchers at bi-weekly clinic visits to measure real-world gait speeds, step counts, total active time, and spatial asymmetries without the patient altering their natural routine. No constraints were placed on gait modifications. If the patient guards their wound by walking flat-footed or shuffling, the behavior is recorded but not corrected, providing a true representation of unguided real-world walking mechanics.

Time frame: at base line and 12 weeks

saline injection

Time frame: at base line and 12 weeks

using Image J software

Time frame: at baseline and 12 weeks

The Venous Filling Index (VFI) is a quantitative measurement used to assess the severity of venous reflux in patients with venous leg ulcers. It is determined using air plethysmography, which tracks changes in leg volume during and after a series of standardized calf muscle contractions. VFI is calculated as the rate at which blood refills the veins after each contraction, expressed in milliliters per second (mL/sec). A higher VFI indicates more rapid venous refilling, reflecting greater venous insufficiency and reflux. Monitoring VFI allows clinicians to objectively compare the effectiveness of interventions, such as structured calf muscle pump activation strategies versus unsupervised home walks, in improving venous return and supporting ulcer healing.

Time frame: at base line and 12 weeks

To measure Ejection Fraction (EF) as an indicator of calf muscle pump efficacy during a single contraction, use duplex ultrasound or air plethysmography to assess venous volume changes in the lower leg. First, record the baseline venous volume with the patient in a relaxed, supine position. Then, instruct the patient to perform a single, deliberate calf muscle contraction (such as plantarflexion). Immediately measure the post-contraction venous volume. EF is calculated as the percentage of blood ejected from the veins during the contraction: EF (%) = \[(baseline volume - post-contraction volume) / baseline volume\] × 100. This value quantifies how effectively the calf muscle pump expels venous blood with each contraction.

Optimizing Venous Leg Ulcer Healing Via Dose-Response Structured Calf Muscle Pump Activation Strategies Versus Unsupervised Home Walks