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Correcting Vitamin D Insufficiency Improves Some But Not All Aspects of Physical Performance During Winter Training in Taekwondo Athletes

Jung, Hyun Chul, Seo, Myong Won, Lee, Sukho, Jung, Sung Woo, Song, Jong Kook·2018·International Journal of Sport Nutrition and Exercise Metabolism
DOI 10.1123/ijsnem.2017-0412
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Abstract

We investigated the effects of vitamin D 3 supplementation on physical performance during winter training in vitamin D insufficient taekwondo athletes. Thirty-five collegiate male and female taekwondo athletes, aged 19–22 years with low serum 25(OH)D concentration (28.8 ± 1.10 nmol/L), were randomly assigned to a vitamin D group (n = 20) or a placebo group (n = 15). Subjects received either a vitamin D 3 capsule (5,000 IU/day) or a placebo during 4 weeks of winter training. Blood samples were collected for analyzing serum 25(OH)D concentration. Physical performance tests included Wingate anaerobic test, isokinetic muscle strength and endurance, a countermovement jump test, sit-ups, agility test, and 20-m pacer. Serum 25(OH)D concentrations increased significantly in the vitamin D group (96.0 ± 3.77 nmol/L) after 4 weeks of supplementation, but no changes were found in the placebo group (F = 242.44, p = .000). There were significant interaction effects for anaerobic peak power (F = 7.49, p = .010) and isokinetic knee extension at 180 deg/s (F = 6.08, p = .019). Changes in serum 25(OH)D concentration were positively associated with changes in peak power and isokinetic knee extension at 180 deg/s. However, no significant interaction effects were observed in other performance variables. This study suggests that 4 weeks of vitamin D supplementation elevates serum 25(OH)D concentration to sufficient levels. Correcting vitamin D insufficiency improves some but not all aspects of performance. Thus, efficacy of vitamin D supplementation to enhance performance remains unclear.

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Metadata

Authors
Jung, H. C., Seo, M. W., Lee, S., Jung, S. W., & Song, J. K.
Affiliations
  • University of Louisiana at Monroe
  • Kyung Hee University
  • Texas A&M University-San Antonio
Venue
International Journal of Sport Nutrition and Exercise Metabolism
Publisher
Human Kinetics
Published
2018-11-01
Volume
28
Issue
6
Pages
635-643
ISSN
  • 1526-484X
  • 1543-2742
DOI
10.1123/ijsnem.2017-0412
Cited by
39
References
5

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CoChat. (2026). Citation check: Correcting Vitamin D Insufficiency Improves Some But Not All Aspects of Physical Performance During Winter Training in Taekwondo Athletes. https://app.cochat.ai/papers/10.1123/ijsnem.2017-0412
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Jung, H. C., Seo, M. W., Lee, S., Jung, S. W., & Song, J. K. (2018). Correcting Vitamin D Insufficiency Improves Some But Not All Aspects of Physical Performance During Winter Training in Taekwondo Athletes. International Journal of Sport Nutrition and Exercise Metabolism. https://doi.org/10.1123/ijsnem.2017-0412

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