DEFINITION of 'Lean Six Sigma'. Lean Six Sigma is a managerial approach that combines Six Sigma methods and tools and the lean manufacturing/lean enterprise philosophy, striving to eliminate waste of physical resources, time, effort and talent, while assuring quality in production and organizational processes. Six Sigma certification.
Muscle weakness or myasthenia is a lack of muscle strength. The causes are many and can be divided into conditions that have either true or perceived muscle weakness. True muscle weakness is a primary symptom of a variety of skeletal muscle diseases, including muscular dystrophy and inflammatory myopathy. It occurs in neuromuscular junction disorders, such as myasthenia gravis. Muscle weakness can also be caused by low levels of potassium and other electrolytes within muscle cells. It can be tem
Photo Credit John Lund/Blend Images/Getty Images. There are many causes for the deterioration of muscles. Muscle wasting, or atrophy, occurs in two basic forms: disuse atrophy in which the muscles waste away due to lack of exercise, and neurogenic atrophy, which is muscle deterioration due to disease or injury.