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Effect of acute endurance and strength exercise on circulating calcium‐regulating hormones and bone markers in young healthy males
Author(s) -
Rong H.,
Berg U.,
Tørring O.,
Sundberg C. J.,
Granberg B.,
Bucht E.
Publication year - 1997
Publication title -
scandinavian journal of medicine and science in sports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.575
H-Index - 115
eISSN - 1600-0838
pISSN - 0905-7188
DOI - 10.1111/j.1600-0838.1997.tb00132.x
Subject(s) - osteocalcin , medicine , endocrinology , parathyroid hormone , n terminal telopeptide , calcitonin , bone remodeling , vo2 max , hormone , physical exercise , calcium , chemistry , heart rate , alkaline phosphatase , blood pressure , biochemistry , enzyme
Physical activity plays a role in the maintenance of the skeleton but the mechanical, metabolic and hormonal mechanisms involved are largely unknown. The influnence of acute endurance and strength exercise on circulating levels of calcitonin, parathyroid hormone (PTH), PTH‐related peptide (PTHrP), osteocalcin, carboxyterminal cross‐linked telopeptide of type I collagen (ICTP) and ionized calcium (Ca 2+ ) was therefore evaluated. Eight healthy young males performed three exercise bouts on separate accasions: endurance exercise i.e. cycling on a cycle ergometer for 45 mim at 55% of Vo 2max (E55%) and 15 min at 85% of Vo 2max (E 85%) and strength exercise at 85% of three repetitions maximum using a legpress device (STR). Control experiments included the same subjects with the same time schedule but without exercise. Blood samples were taken before, immediately after exercise and during the recovery period. Hormones and bone markers were measured by use of various immunoassays. There was no obvious influence on calcitonin and PTHrP levels, whereas PTH was increased after strength exercise. ICTP and osteocalcin levels correlated positively at all times and showed regular variations. In comparison with the controls, ICTP levels showed a more pronounced decrease following physical activity whereas osteocalcin followed the same pattern as the controls except for after prolonged endurance exercise when a decrease was abolished. In conclusion, an increase in PTH after strength exercise and a pronounced decrease in ICTP after all exercise together with a relative increase in osteocalcin after prolonged endurance exercise might reflect some mechanisms involved in the positive effect of physical activity on bone mass.