Effects of post exercise protein supplementation on markers of bone turnover in adolescent swimmers

Table 2 Circulating levels of bone turnover markers and indices of bone turnover rate and balance for each group (protein, carbohydrate, water) at baseline, i.e. morning, fasted resting concentrations, as well as at 8 and 24 h. Data are presented as mean ± SEM

Variables	Protein (n = 21)	Carbohydrate (n = 19)	Water (n = 18)	Between Groups (P value^!)
CTXI (ng^.ml⁻¹)
Baseline	0.46 ± 0.07	0.56 ± 0.09	0.45 ± 0.08	0.58
8 h	0.54 ± 0.07	0.56 ± 0.08	0.42 ± 0.06	0.44
24 h	0.42 ± 0.07	0.55 ± 0.09	0.41 ± 0.07	0.42
PINP (ng^.ml⁻¹)
Baseline	376.7 ± 108.1	650.0 ± 158.1	547.5 ± 131.5	0.32
8 h	403.5 ± 122.1	678.1 ± 153.2	547.0 ± 133.1	0.32
24 h	362.1 ± 104.8	581.7 ± 129.9	535.4 ± 132.5	0.35
BT Balance
Baseline	2.0 ± 0.6	2.2 ± 0.7	2.7 ± 0.9	0.84
8 h	2.8 ± 0.9	2.1 ± 0.6	1.7 ± 0.6	0.64
24 h	2.4 ± 0.8	2.0 ± 0.7	2.2 ± 0.8	0.95
BT Rate
Baseline	2.9 ± 0.6	2.4 ± 0.3	2.4 ± 0.3	0.76
8 h	3.8 ± 0.9	2.3 ± 0.3	1.9 ± 0.2	0.09
24 h	2.4 ± 0.7	2.0 ± 0.3	2.2 ± 0.3	0.16

CTXI Carboxy-terminal collagen crosslinks, PINP Procollagen type 1 intact N-terminal propeptide, BT Balance Bone turnover balance calculated as MoMF/MoMR, where MoM is the Multiple of Median of formation (MoM_F) and resorption (MoM_R), BT Rate Bone turnover rate calculated as √(MoM_F² + MoM_R²). ^!One-way ANOVAs were performed using log transformed values

ISSN: 1550-2783