Editing Isometric exercise (section)

==NASA studies==
[[NASA]] has researched the use of isometrics in preventing [[muscle atrophy]] experienced by [[astronauts]] as a result of living in a [[Weightlessness|zero gravity]] environment. Isometrics, [[Eccentric contraction|muscle lengthening]] and [[Concentric contraction|muscle shortening]] exercises were studied and compared. The outcome showed that while all three exercise types promoted muscle growth, isometrics failed to prevent a decrease in the amount of [[Muscle contraction|contractile proteins]] found in the muscle tissue. The result was muscle degradation at a molecular level. As contractile [[proteins]] are what cause muscles to contract and give them their [[physical strength]], NASA concluded that isometrics may not be the best way for astronauts to maintain muscle tissue.<ref>{{cite web | url = http://www.nasa.gov/vision/earth/livingthings/10dec_muscles.html | title = Why do Workouts Work? | date = 2004-10-12 | access-date = 2008-01-10 | publisher = [[NASA]] | last = Barry | first = PL |author2=Phillips, T }}</ref>