Table 2.

Heart rates before, during, and after submergence in the euthyroid and hyperthyroid state.

Phase of dive cycle	Euthyroid (beats·min−1)	Hyperthyroid (beats·min−1)	Hyperthyroid (% of euthyroid)
Pre-dive	133.35 ± 5.09	130.76 ± 7.38	98.1
Dive: min 1	31.76 ± 4.18	29.23 ± 6.01†	92.0†
Dive: min 2	27.61 ± 3.38	25.39 ± 4.71†	91.9†
Dive: min 3	22.39 ± 2.13	20.43 ± 5.29†	91.2†
Dive: min 4	18.23 ± 3.46	17.41 ± 4.21	95.5
Dive: min 5	16.60 ± 3.86	15.62 ± 3.06†	94.1†
Post-dive	144.72 ± 8.00	145.76 ± 5.12	100.7

Values are grand means which were established from individual seal means (N = 5 seals, n = 10 trials per seal and condition.

^†Indicates a significant difference from the euthyroid state.