Too much exercise can be harmful. Without proper rest, the chance of stroke or other circulation problems increases,[80] and muscle tissue may develop slowly. Extremely intense, long-term cardiovascular exercise, as can be seen in athletes who train for multiple marathons, has been associated with scarring of the heart and heart rhythm abnormalities.[81][82][83] Specifically, high cardiac output has been shown to cause enlargement of the left and right ventricle volumes, increased ventricle wall thickness, and greater cardiac mass. These changes further result in myocardial cell damage in the lining of the heart, leading to scar tissue and thickened walls. During these processes, the protein troponin increases in the bloodstream, indicating cardiac muscle cell death and increased stress on the heart itself.[84]
The practice of the MMB methods is generally emphasized in three areas. Firstly, human movement is achieved with involvement of a centrally controlled dynamic synergy between the body’s stability and mobility movement elements.61 Hoffman J, Gabel P. Expanding Panjabi’s stability model to express movement: A theoretical model. Med Hypotheses. 2013;80(6):692–7.10.1016/j.mehy.2013.02.006[Crossref], [PubMed], [Web of Science ®] [Google Scholar] This ensures all the muscles of the body concurrently employ or counter movement forces which results in visible harmonious movements. Secondly, functionality is required as the MMB is aimed at correct natural movements that reflect the requirements of activity and life in the modern world. Consequently, non-functional movements are unjustified as an MMB exercise. Thirdly, learning of MMB exercises requires a cognitive focus on achieving harmonious functional movements. With practice, the cognitive learning process enables an automatic and harmonious physical performance, making the exercises as well as everyday tasks easier, safer, and more efficient. The MMB exercises were intended by their creators to be healthy and enjoyable, a cultural alternative to the practice of aggressively overtraining the body and accepting pain and injury as normal components of sport.
Recruitment criteria were one or both of sedentariness and dysmetabolism. Thus, we selected subjects who were not physically active or involved in any exercise program; that is, they had a sedentary lifestyle. Moreover, before entering the study, they were carefully screened for metabolic problems which attested a dysmetabolic status, as increased levels of plasma glucose, free fatty acids, triglyceride, and urate in fasting state. Both criteria were verified by means of family doctor databases of subjects.