Regular physical activity is important for maintaining good health throughout the summer as well. However, high temperatures can significantly increase the strain placed on the body. During activities such as running, cycling or beach volleyball, the body has to supply the muscles with oxygen while simultaneously working to cool itself down. This places additional demands on the heart and cardiovascular system.
In hot weather, the risk of dehydration increases and circulating blood volume may decrease, while heart rate may rise. At the same time, the loss of electrolytes can lead to muscle cramps, reduced performance or feeling unwell. During intense exercise, muscle micro-injuries may also be more pronounced, while recovery can take longer.
Laboratory testing can help assess how the body has responded to increased physical strain. In addition to a complete blood count, CK and LDH can provide information about muscle stress and damage, while troponin testing may, when clinically indicated, provide information about possible cardiac muscle involvement. Cortisol levels can indicate the body’s response to physical stress, while sodium and potassium levels are important for assessing electrolyte balance.
The best form of prevention, however, remains appropriate timing. Whenever possible, exercise in the morning or evening, ensure adequate fluid and electrolyte intake, and do not push yourself if you experience unusual fatigue, dizziness or chest discomfort.
Frequently Asked Questions
Why is intense exercise more challenging in hot weather?
Because the strain on the heart increases while the body also loses more fluids and electrolytes.
Which laboratory tests may be useful for athletes?
A complete blood count, CK, LDH, troponin, cortisol, as well as sodium and potassium testing can provide useful information.
When should I stop exercising?
Stop exercising if you experience chest pain, dizziness, confusion, muscle cramps or unusual weakness.