Medical leaves due to pain and discomfort
Musculoskeletal disorders (MSDs) are one of the common causes of occupational injuries and disabilities in the developing and developed countries. Despite the development of mechanized and automated processes, work related MSDs are still the main causes of lost work hours, higher costs, and injuries. As recommended by studies, feeling a pain and discomfort in different parts of the musculoskeletal system is one of the main issues at work [1]. By MSDs caused by work, we refer to injuries to muscles, tendons, and nerves that emerge as physical discomfort, pain, and numbness in different body limbs [2]. It is not easy to fine a workshop or a factory where the workers are not complaining of physical discomfort and pain and the situation is worse when the physical condition of the workers does not fit the work load and pressure [3]. The MSDs are usually the result of long-term repetitious pressure on soft body tissues like the nerves, muscles, tendons, and joints. They are the most prevalent cause of long-term and debilitating physical pains and have a deep effect on society. In addition, MSDs are one of the most common causes of disability to work and medical leaves [4]. Medical leave is a major general health problem with social and economic consequences for individuals and society [5].
Physical activity and readiness improve and preserve general health condition. Physical activity is effective in keeping physical readiness, controlling the weight, preserving and improving bone density, muscle, and joint maneuverability, improving physiological health, and improving the immunity system. Thereby, physical activity is effective in preventing MSDs [6]. Expansion of technology and mechanical life has led to less physical activity for man; while, about 70% of diseases are the outcomes of lack of physical activity [7]. Regular physical activity is essential and lack of it is a global health issue and one of the ten main causes of mortality in the world. Lack of physical activity doubles the risk of cardiovascular diseases, diabetes type II, and obesity. In addition, the risks of breast and colorectal cancers, hypertension, fat disorders, osteoporosis, depression, and anxiety are higher in individuals with lack of physical activity [8]. Regular physical activity is one of the ways to improve immunity system and prevent noncontagious diseases. It also has positive mental effects through lowering depression and anxiety levels. In addition, physical activity brings specific economic benefits through lowering the costs of medical cares and improving productivity [9]. Several studies have been conducted on the role of physical activity in lowering the prevalence of physical and mental disease and improving physical performance. Regular physical activity improves physical readiness of workers and decreases the rate of MSDs [10]. Occupational MSDs are usually multi-cause and affected by different factors.