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In the early 1960s, deployment of rocket-powered ejection seats designed for use at supersonic speeds began in such planes as the Convair F-106 Delta Dart. Six pilots have ejected at speeds exceeding 700 knots (1,300 km/h; 810 mph).
Ejection fraction refers to the relative amount of blood that is pumped out of both the right and left ventricles with each contraction of the heart. There are a number of ways to increase ejection fraction, with regular exercise and a heart-healthy diet being the safest and most effective. Like any machine, there are times when the heart is functioning efficiently and healthily. Other times, different factors may cause the heart to function improperly.