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Outdoor Exercise Boosts Vitamin D Naturally
26 May
Summary
- Outdoor exercise may naturally protect vitamin D levels in winter.
- Vitamin D supplements supported immune balance but not performance.
- Non-supplemented non-runners saw vitamin D levels drop over 32%.
As winter approaches, vitamin D levels naturally decline due to reduced sunlight. A study involving recreational runners and non-runners investigated the impact of outdoor exercise and supplementation on vitamin D levels and immune function during autumn and winter 2023-2024. Participants took vitamin D supplements daily for eight weeks, or none at all.
The research revealed that while vitamin D supplements helped maintain blood levels and supported the immune system, they did not enhance athletic performance. A significant finding was that runners exercising outdoors maintained healthier vitamin D levels compared to non-runners, suggesting outdoor activity offers a natural protective strategy.
Non-supplemented non-runners experienced the sharpest decline in vitamin D, over 32%. Conversely, outdoor runners showed more stable levels. Supplements did support white blood cell counts, indicating a more balanced immune system, but did not prevent illness.
Key athletic performance metrics such as oxygen consumption and leg strength showed no improvement from supplementation. The study concluded that outdoor exercise is crucial for health, providing benefits that supplements cannot fully replicate, emphasizing movement and sunlight exposure over pills alone.
