Effects of different winter paddock management of Thoroughbred weanlings and yearlings in the cold region of Japan on physiological function, endocrine function and growth.

LF power, which reflects both sympathetic and parasympathetic nervous activity, showed a trend of increase from November to January in the 22hr group, while there was little change in the 7hr+W group ( Fig. 5C ).

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The HF power, which reflects parasympathetic activity, showed an increasing trend from November to January in the 22hr group, whereas the 7hr+W group showed a decreasing trend.

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