The Effect of Exercise Program Applied to Patients With Scleroderma on Functional Outcomes: A Randomized Controlled Trial

Systemic sclerosis (scleroderma) is a significant, rare autoimmune connective tissue disease characterized by autoantibodies, fibrosis of the skin and internal organs, microvascular injury and vascular damage due to endothelial cell activation (Sepulveda et al., 2019; Rosendahl et al., 2022). The term "scleroderma" is derived from two Greek words "sklero" and "derma" meaning hard skin (Bielacka et al., 2017; Singh et al., 2019).

The global prevalence of scleroderma is estimated to be between 0.3 and 40 per 100,000 population (Alhendi et al., 2020; Benz et al., 2021; Sierakowska et al., 2019). The occurrence of systemic sclerosis in women is three to five times and in some literature up to eight times higher than in men. The disease incidence peaks between the ages of 30 and 65 (Sierakowska et al., 2019; Hughes et al., 2020; Alhendi et al., 2020).

Impairment of hand functions is one of the most significant disabilities in patients with scleroderma and is commonly observed (Gregory et al., 2019; Mugii et al., 2019). The skin of the hand thickens with manifestations including fingertip ulcers, swelling of the fingers, raynaud's phenomenon and subcutaneous calcium deposition (Abreu et al., 2023). Deformities such as loss of flexion in the metacarpophalangeal joints, loss of extension in the proximal and distal interphalangeal joints, loss of abduction, flexion of the thumb and wrist movement can occur, leading to contractures and severe impairment of hand functions (Bongi & Rosso, 2016; Vannajak et al., 2014).

Besides hand function impairment, another significant issue in scleroderma is the fibrotic involvement of the connective tissue of the face and mouth. Patients tend to lose facial expression. Sclerosis of the skin around the lips and mouth area causes a reduction in mouth opening (microstomia) and width (microcheilia) in 43% to 80% of cases (Puzio et al., 2019; Uras et al., 2019).

Rehabilitation strategies which play a crucial role in the management of scleroderma, include psychoeducational interventions, exercise therapy, application of physical methods, assistive devices and orthoses; joint protection and energy conservation approaches, dietary interventions and comprehensive multidisciplinary team care programs (Schouffoer et al., 2011). Among these interventions daily hand exercises are specifically mentioned to improve hand movement and function, and also mouth and facial exercises positively affect mouth opening function (Gregory et al., 2019). Hand rehabilitation enhances hand movement, functionality and strength, as well as participation in daily life activities such as self-care, housework, work and recreational activities, thereby improving quality of life (Bongi & Rosso, 2016). Exercises that stretch the mouth and increase mouth opening are reported to prevent the progression of microstomia and reduce limitations in mouth opening (Puzio et al., 2019; Yuen et al., 2012). Some approaches and techniques involving active exercises for managing microstomia are suggested, indicating success with the performance of mandibular movements (Puzio et al., 2019).