Table 1.

Metabolic responses before and after 60 minutes of exercise under placebo and calcium (Ca) supplementation conditions in experiment 1 (n=10). Results are mean±SD or mean change (95% CI).

	Condition	Before	After*	Change (95% CI)	p value
iCa, mg/dL	Calcium	4.66 ± 0.22	4.49 ± 0.28	−0.17 (−0.38, 0.04)	0.10
	Control	4.70 ± 0.21	4.42 ± 0.18	−0.27 (−0.35, −0.19)	<0.001
	Ca vs. Control			−0.10 (−0.34, 0.14)	0.37
PTH, pg/mL	Calcium	42.7 ± 18.2	50.9 ± 19.1	8.3 (0.0,16.5)	0.05
	Control	50.1 ± 24.4	76.1 ± 35.0	26.1 (8.1, 44.0)	0.009
	Ca vs. Control			17.8 (2.3, 33.3)	0.03
CTX, ng/mL	Calcium	0.47 ± 0.24	0.48 ± 0.26	0.01 (−0.04, 0.05)	0.73
	Control	0.44 ± 0.22	0.50 ± 0.24	0.06 (0.01, 0.11)	0.02
	Ca vs. Control			0.05 (−0.01, 0.12)	0.08
Hct, %	Calcium	40.9 ± 3.2	41.4 ± 3.5	0.5 (−1.2, 2.2)	0.53
	Control	40.8 ± 2.3	41.6 ± 2.7	0.8 (−0.2, 1.8)	0.10
	Ca vs. Control			0.3 (−1.3, 1.9)	0.69

iCa, ionized calcium; PTH, parathyroid hormone; Hct; hematocrit; CTX, C-terminal telopeptides of type I collagen

^*samples were obtained immediately after exercise for iCa, PTH, and HCT and 30 minutes after exercise for CTX