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Cardiovascular responses to acute restraint stress in short- and long-day hamsters. Acute restraint stress decreased heart period (A) and RSA (B). Short-day hamsters had higher RSA scores before and during restraint and 10, 60, and 120 min after the conclusion of restraint. Data are presented as mean ± SEM, and mean differences were considered statistically significant when P < 0.05; *, significantly different from long days.
