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The impact of acute calcium intake on bone turnover markers during a training day in elite male rowers
Lundy, Bronwen McKay, Alannah K. A. Fensham, Nikita Tee, Nicolin Anderson, Bryce Morabito, Aimee Ross, Megan L. R. Sim, Marc Ackerman, Kathryn E. Burke, Louise M.
Lundy, Bronwen
McKay, Alannah K. A.
Fensham, Nikita
Tee, Nicolin
Anderson, Bryce
Morabito, Aimee
Ross, Megan L. R.
Sim, Marc
Ackerman, Kathryn E.
Burke, Louise M.
Abstract
Introduction
Although an acute exercise session typically increases bone turnover markers (BTM), the impact of subsequent sessions and the interaction with preexercise calcium intake remain unclear despite the application to the “real-life” training of many competitive athletes.
Methods
Using a randomized crossover design, elite male rowers (n = 16) completed two trials, a week apart, consisting of two 90-min rowing ergometer sessions (EX1, EX2) separated by 150 min. Before each trial, participants consumed a high (CAL; ~1000 mg) or isocaloric low (CON; <10 mg) calcium meal. Biochemical markers including parathyroid hormone (PTH), serum ionized calcium (iCa) and BTMs (C-terminal telopeptide of type I collagen, osteocalcin) were monitored from baseline to 3 h after EX2.
Results
Although each session caused perturbances of serum iCa, CAL maintained calcium concentrations above those of CON for most time points, 4.5% and 2.4% higher after EX1 and EX2, respectively. The decrease in iCa in CON was associated with an elevation of blood PTH (P < 0.05) and C-terminal telopeptide of type I collagen (P < 0.0001) over this period of repeated training sessions and their recovery, particularly during and after EX2. Preexercise intake of calcium-rich foods lowered BTM over the course of a day with several training sessions.
Conclusions
Preexercise intake of a calcium-rich meal before training sessions undertaken within the same day had a cumulative and prolonged effect on the stabilization of blood iCa during exercise. In turn, this reduced the postexercise PTH response, potentially attenuating the increase in markers of bone resorption. Such practical strategies may be integrated into the athlete’s overall sports nutrition plan, with the potential to safeguard long-term bone health and reduce the risk of bone stress injuries.
Keywords
endurance, nutrient timing, osteocalcin, PTH, β-CTX-I, calcium, bone
Date
2023
Type
Journal article
Journal
Book
Volume
55
Issue
1
Page Range
55-65
Article Number
ACU Department
Centre for Exercise and Nutrition
Faculty of Health Sciences
Mary MacKillop Institute for Health Research
Faculty of Health Sciences
Mary MacKillop Institute for Health Research
Collections
Relation URI
Source URL
Event URL
Open Access Status
Published as ‘gold’ (paid) open access
License
CC BY-NC-ND 4.0
File Access
Open