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  • Title: Behaviour of serum T3, rT3, TT4, FT4 and TSH levels after exercise on a bicycle ergometer in healthy euthyroid male young subjects.
    Author: Licata G, Scaglione R, Novo S, Dichiara MA, Di Vincenzo D.
    Journal: Boll Soc Ital Biol Sper; 1984 Apr 30; 60(4):753-9. PubMed ID: 6732949.
    Abstract:
    In order to know thyroid function during physical activity, just studied by several authors without univocal findings, we have submitted 10 young subjects, non athletes, aged 22-25 years (mean age 23, 6 +/- 1, 43) to a biologically maximal exercise on a bicycle ergometer. We have also examined the change of TSH serum levels during exercise. Our data show an evident increase of T4 (18, 60% at 10'), p less than 0.025, an increment of FT4 (28, 49 soon after the strain), and no relevant change of T3 and rT3 serum levels. Moreover TSH values show a reduction at 30' (-26, 15%) in comparison with the basal level. Our findings confirm the known increment of T4 and FT4 serum level after physical activity. It can be due, more than an hemoconcentration supported by others, to a real rise of thyroid incretion as in our opinion TSH levels reduction suggests. Concluding we think that the increase of T4 and decrease of TSH could be due to a direct influence of the physical activity on the system interested in their production.
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