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Why Do I Feel Tired When I Work Out? | Q+A
Question:
When I exercise, I feel tired. What do I need to take during day? I work in construction but I’m not doing any hard job.
– Raumir
Answer:
Right off the bat, you shouldn’t need to “take” anything. Look at your sleep, energy intake, and hydration. Chances are you are depleted in one of those areas accounting for your tiredness. Exercising too heavily or intensely may prevent adequate oxygen utilization and cause you to burn out early.
Solution:
- Fully allow your body to rest and repair, enabling you to maximize your physical and mental performance. Be sure you are getting at least 6 hours of uninterrupted quality (deep) sleep.
- Eat a proper diet of sufficient calories, assisting you to complete a full workout. Constant movement can burn up to 5000 calories per day, even if you never lift more than 30 pounds or use great force!
- Drink adequate fluids to support physiological processes responsible for energy production and muscle movement. Consume at least one ounce per kilogram of body weight. That’s about 1 cup of fluid per 15 pounds.
- Work out at a moderate intensity such that you can still carry on a light conversation.
If you’re already practicing the above and still have problems with sleepiness or lack of endurance, be sure to check with your physician to rule out any other underlying cause, such as anemia.
– Debbie J., MS, RD
This article should not replace any exercise program or restrictions, any dietary supplements or restrictions, or any other medical recommendations from your primary care physician. Before starting any exercise program or diet, make sure it is approved by your doctor.
Some questions have been edited for length and/or clarity.
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