Analgesic treatment affects (A) nighttime HR, (B) daytime HR, (C) nighttime MAP, and (D) daytime MAP. Insets, mean variation in MAP or HR during early (days 0 to 2), intermediate (days 3 to 5), and late (days 6 to 9) postoperative periods. BUP, buprenorphine; MEL, meloxicam; *, P < 0.05 compared with the meloxicam group during the same time interval; †, P < 0.01 compared with the meloxicam group during the same time interval; ‡, P < 0.05 compared with baseline value (postoperative day 9 or 10) in the same treatment group; §, P < 0.01 compared with baseline value (postoperative day 9 or 10) in the same treatment group. Shaded area indicates analgesic treatment period.