HypoActive

Researchers in Japan found a benefit from high intensity, intermittent swimming on the sensitivity of muscle glucose uptake to insulin following exercise, when compared to low-intensity prolonged exercise.  This research was conducted on rats:

http://www.ncbi.nlm.nih.gov/pubmed/18502256?ordinalpos=3&itool=EntrezSystem2.PEntrez.Pubmed.Pubmed_ResultsPanel.Pubmed_RVDocSum

Research published June 2008.