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Bradycardia, or a slower than normal heart rate, is commonly associated with hypothyroidism because the thyroid hormone plays a crucial role in regulating metabolism and cardiovascular function. In individuals with hypothyroidism, the deficiency in thyroid hormones leads to a decrease in metabolic rate, which can result in a slower heart rate. This is due to the fact that thyroid hormones are vital in maintaining the normal function of the heart by influencing heart rate and the strength of heart contractions.

In contrast, other symptoms related to the cardiovascular system, such as increased heart rate or hypertension, are often seen in conditions where thyroid hormone levels are elevated, such as hyperthyroidism. Palpitations may occur in both conditions but are not specifically indicative of hypothyroidism. Thus, bradycardia stands out as a clear manifestation of the reduced metabolic activity due to low thyroid hormone levels.