High doses of vitamin C plus E reduce strength training-induced improvements in areal bone mineral density in elderly men
Abstract
Purpose
Resistance training is beneficial for maintaining bone mass. We aimed to investigate the skeletal effects of high doses of antioxidants [vitamin C + E (α-tocopherol)] supplementation during 12-week supervised strength training in healthy, elderly men
Methods
Design: double-blinded randomized placebo-controlled study. Participants followed a supervised, undulating periodic exercise program with weekly adjusted load: 3 sessions/week and 3–15 repetitions maximum (RM) sets/exercise. The control group (CG, n = 17, 67 ± 5 years) received placebo and the antioxidant group (AO, n = 16, 70 ± 7 years) 1000 mg vitamin C + 235 mg vitamin E, daily. Areal bone mineral density (aBMD) at whole body, lumbar spine (L1–L4), total hip, and femoral neck were measured by dual energy X-ray absorptiometry and muscle strength by 1RM. Serum analyses of bone-related factors and adipokines were performed.
Results
In the CG, total hip aBMD increased by 1.0% (CI: 0.3–1.7) versus pretest and lumbar spine aBMD increased by 0.9% (CI: −0.2 to 2.0) compared to the AO. In the CG, there was an increase in serum concentrations of insulin-like growth factor 1 [+27.3% (CI: −0.3 to 54.9)] and leptin [+31.2% (CI: 9.8–52.6)) versus pretest, and a decrease in sclerostin [−9.9% (CI: 4.4–15.3)] versus pretest and versus AO. Serum bone formation markers P1NP and osteocalcin increased in both groups, while the bone resorption marker CTX-1 remained unchanged.
Conclusion
High doses of antioxidant supplementations may constrain the favorable skeletal benefits of 12 weeks of resistance exercise in healthy elderly men.
Keywords
Strength training Elderly men Vitamin C + E Bone mineral densityAbbreviations
- 1RM
One repetition maximum
- aBMD
Areal bone mineral density
- ANCOVA
Analysis of covariance
- AO
Antioxidant group
- BMC
Bone mineral content
- BMD
Bone mineral density
- BMI
Body mass index (m/h2)
- CG
Control group
- CI
95% confidence interval
- CTX-1
C-terminal telopeptide from type 1 collagen
- CV
Coefficient of variation
- DKK1
Dickkopf-related protein protein 1
- DXA
Dual energy X-ray absorptiometry
- GH
Growth hormone
- IGF-1
Insulin`-like growth factor 1
- IQR
Interquartile range
- OC
Osteocalcin
- OPG
Osteoprotegerin
- P1NP
Procollagen type 1 N-terminal propeptide
- PTH
Parathyroid hormone
- RANKL
Receptor activator for nuclear factor κB ligand
- RM
Repetition maximum
- ROS
Reactive oxygen species
- SD
Standard deviation
- TNF-α
Tumor necrosis factor α
- vitD25
25-hydroxy vitamin D3
Notes
Acknowledgements
This work has been supported by grants from the Liaison Committee between the Central Norway Regional Health Authority and the Norwegian University of Science and Technology (NTNU), Regional Research Funds, Agder, Norway and The Smartfish Company, Norway. The authors would like to thank Prof. Lene Frost Andersen for analysis of dietary registrations, Hanne Vestaby for conducting the DXA measurements, and the participants for their dedication.
Compliance with ethical standards
Conflict of interest
All authors declare no conflict of interest.
Author contributions
The project was performed at the Department of Public Health, Sport and Nutrition, University of Agder, Norway and at the Department of Cancer Research and Molecular Medicine, Norwegian University of Science and Technology, (NTNU), Trondheim, Norway. Study design: SB, THS, KJH, and HLS. Study conduct: SB, THS, KJH, HLS, GH, and TB. Data collection: AKS, SB, THS, KJH, HLS, GH, and TB. Data analyses: AKS, TB, and THS. Data interpretation: AKS, MPM, TB, and US. Drafting manuscript: AKS. Revising manuscript: AKS, US, MPM, GH, TB, SB, THS, KJH, HLS, TR, and GP. Approved the final version of the manuscript: AKS, US, MPM, GH, TB, SB, THS, KJH, HLS, TR, and GP.
Supplementary material
References
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