Vitamin D in Sports: JISSN Position Stand

## Summary

The JISSN Position Stand by Dahlquist DT et al. from 2015 analyzes vitamin D status in athletes and was published in the Journal of the International Society of Sports Nutrition.

Study Background

This position stand examines the relationship between vitamin D status and athletic performance, muscle strength, and injury risk.

Key Findings

The position stand shows: - Optimal blood levels: >40 ng/ml (100 nmol/L) for optimal performance - Supplementation: 1000-2000 IU/day for maintenance, higher doses in deficiency - Seasonal variation: Winter months critical in northern latitudes - Muscle strength: Vitamin D receptors in muscle cells influence strength - Immune function: Reduced infection risk with adequate status

Methodology

The position stand is based on studies of vitamin D status, supplementation, and performance in athletes.

Scientific Context (No approved Health Claims)

Please note: The following information describes scientific study results. They do not constitute recommendations for health claims and must not be used as such.

These position stand findings are relevant for: - Scientific product development: Dosing strategies for athletes - Study results: Vitamin D and muscle strength correlations - Dosing studies: 1000-2000 IU/day for maintenance - Transparency: Blood level monitoring and seasonal variations

Source

The full position stand is freely accessible.

Authors: Dahlquist DT, Dieter BP, Koehle MS Year: 2015 Journal: Journal of the International Society of Sports Nutrition DOI: 10.1186/s12970-015-0093-8

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*Note: This summary is for informational purposes only. The presented study results are not approved health claims. For detailed information, please consult the original source.*