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Serum levels of thyrotrophin (TSH), prolactin (PRL), free thyroxine (FT4) and free triiodothyronine (FT3) were determined before and after physical exercise in 21 normal male subjects. The subjects were divided into 3 groups as follows: group I--light exercise (exercise on the Mijnhardt bicycle ergometer at 100 Watts for 15 min); group II--moderate exercise (a 5 km marathon); group III--heavy exercise (a 10 km marathon). In group I, TSH level rose from 1.96 +/- 0.42 mu u/ml (mean +/- SEM) to 2.52 +/- 0.30 mu u/ml (p less than 0.01), and PRL levels rose from 11.0 +/- 2.0 ng/ml to 19.0 +/- 5.2 ng/ml (p less than 0.01). In group II, TSH rose from 2.11 +/- 0.51 mu u/ml to 2.62 +/- 0.56 mu u/ml (p less than 0.05), and PRL rose from 11.2 +/- 1.6 ng/ml to 24.0 +/- 5.2 ng/ml (p less than 0.01). In group III, TSH rose from 2.01 +/- 0.41 mu u/ml to 2.36 +/- 0.45 mu u/ml (p less than 0.02), and PRL rose from 12.1 +/- 2.0 ng/ml to 47.7 +/- 9.3 ng/ml (p less than 0.01). The serum levels of FT4 showed different results among the three groups: Group I showed an increased response from 1.60 +/- 0.12 ng/dl to 1.72 +/- 0.12 ng/dl (p less than 0.01); Group II showed no significant difference; and group III demonstrated a diminished response from 1.61 +/- 0.14 ng/dl to 1.45 +/- 0.16 ng/dl (p less than 0.05).(ABSTRACT TRUNCATED AT 250 WORDS)

Response of thyrotropin, prolactin and free thyroid hormones to graded exercise in normal male subjects.