title: Plasma levels of parathyroid hormone, vitamin D, calcitonin, and calcium in association with endurance exercise.
abstract: Nine male marathon runners were investigated during habitual training (week 0), after 3 weeks of training break (week 3), and after 2 weeks (week 5) and 4 weeks (week 7) of retraining. Maximal oxygen uptake, body fat (BF), and plasma levels of 25(OH)D3, 1,25(OH)2D3, parathyroid hormone (PTH), calcitonin (CT), albumin, and albumin-corrected calcium were determined throughout weeks 0-7. The maximal oxygen uptake decreased after training break and increased during retraining (P = 0.002). BF did not change significantly. Plasma 1,25(OH)2D3 was elevated after training break and decreased after 2 and 4 weeks of retraining [week 0: 44.0 +/- 3.7 (SEM) pg x 1(-1); week 3: 52.4 +/- 6.0 pg x 1(-1); week 5: 42.0 +/- 2.8 pg x 1(-1); week 7: 36.9 +/- 2.3 pg x 1(-1); P = 0.03]. Plasma 25(OH)D3 did not change significantly. Plasma PTH increased throughout the training break and retraining (week 0: 1.36 +/- 0.25 pmol x 1(-1); week 3: 2.02 +/- 0.43 pmol x 1(-1); week 5: 2.23 +/- 0.60 pmol x 1(-1); week 7: 2.63 +/- 0.34 pmol x 1(-1); P = 0.03). Albumin-corrected calcium values were transiently decreased during retraining (week 3: 2.77 +/- 0.08 mM; week 5: 2.47 +/- 0.05 mM; week 7: 2.66 +/- 0.07 mM; P = 0.01). Plasma CT did not change during training break, but was transiently decreased during retraining (week 0: 9.97 +/- 0.39 pmol x 1(-1); week 3: 9.91 +/- 0.37 pmol x 1(-1); week 5: 8.19 +/- 0.50 pmol x 1(-1); week 7: 9.02 +/- 0.45 pmol x 1(-1); P = 0.01).(ABSTRACT TRUNCATED AT 250 WORDS)
authors: Department of Clinical Physiology, Fredriksberg Hospital, Denmark.
authors: T
authors: T
authors: Klausen
authors: L
authors: L
authors: Breum
authors: H A
authors: HA
authors: Sørensen
authors: S
authors: S
authors: Schifter
authors: B
authors: B
authors: Sonne
mesh_terms: D000328:Adult; D002116:Calcitonin / Q000097:blood*; D002117:Calcitriol / Q000097:blood; D002118:Calcium / Q000097:blood*; D006801:Humans; D008297:Male; D008875:Middle Aged; D010101:Oxygen Consumption; D010281:Parathyroid Hormone / Q000097:blood*; D010806:Physical Education and Training; D010807:Physical Endurance; D012420:Running; D014807:Vitamin D / Q000097:blood*
chemical_list: D010281:Parathyroid Hormone; D014807:Vitamin D; D002116:Calcitonin; D002117:Calcitriol; D002118:Calcium