Muscle contraction is the activation of tension-generating sites within muscle fibers.In physiology, muscle contraction does not mean muscle shortening because muscle tension can be produced without changes in muscle length such as holding a heavy book or a dumbbell at the same position.n contrast, a muscle contraction is isotonic if muscle length changes but the muscle tension remains the same. Furthermore, if the muscle length shortens, the contraction is concentric.
Senior Systems Administrators with one to two decades of relevant experience report an average salary of approximately $85K. After two decades in the workforce, the average Senior Systems Administrator generally earns more than ever; median pay for this group is estimated at $92K.
According to the Bureau of Labor Statistics, the average income of a health-care administrator in 2011 was $46.17 an hour and $96,030 a year.he median earnings for this occupation were $41.54 an hour and $86,400 a year, and half of all health-care administrators working in the United States reported incomes of between $67,450 and $112,260 a year. As of 2011, the highest-paying states for health-care administrators were in the Northeast and the far West.