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Triglyceride (TG)-fatty acid (FA) and phospholipid (PL)-FA profiles of skeletal muscles and brown adipose tissue (BAT) were examined in cold-acclimated rats (5•Ž, 4) (CA) and rats reared in cold for 25 generations (25 G). 1. TG of skeletal muscles: Polyunsaturated FA (PU) and unsaturation index (UI) were higher in soleus than in red and white muscles of quadriceps. In white muscle of CA saturated FA (SA) decreased and PU increased. This was also the case in white muscle of 25 G. In soleus of 25 G MU and PU increased, and SA decreased. 2. PL of skeletal muscles: Higher SA, PU and lower MU were found in PL as compared with TG. In red muscle of CA SA increased while PU decreased. No significant changes were observed in white muscle and in soleus. In red muscle of 25 G a similar but more marked changes were found accompanied by lowered arachidonic acid and UI, thus suggesting decreased unsaturation of membrane lipid. 3. TG of BAT: In CA SA increased and MU decreased. In 25 G SA and PU decreased and MU increased. 4. PL of BAT: In CA SA, PU arachidonic acid, AI and UI increased, suggesting in creased unsaturation of membrane lipid. In 25 G AI and arachidonic acid increased, but UI and PU were not changed. These results indicate that cold acclimation would cause significant alterations of FA profiles in tissues which has been shown to be involved in heat production in cold. Their significance, however, should await further study. (Jpn. J. Phys. Fitness Sports Med. 1988, 37:132•`140) key words: cold acclimation, skeletal muscle, brown adipose tissue, fatty acid composition

FATTY ACID COMPOSITIONS OF BROWN ADIPOSE TISSUE AND SKELETAL MUSCLES IN COLD-ACCLIMATED RATS AND RATS REARED IN COLD FOR SUCCESSIVE GENERATIONS