Ambient temperature and relative humidity can be external factors that influence sports performance. This is the reason why there could be some differences between training during summer or winter.
When we refer to nutritional facts, we should consider that in the cold there is less sweating than in hot temperatures. Because of this, loss of water and electrolytes in heat is higher than in cold. We have to take care of the temperature, because both overhydration and dehydration could cause gastrointestinal symptoms and complications during training performance.
EXTRA NUTRITIONAL FACTS There are other details we should take care of like clothing, warm up and mobility, among other facts.
On one hand, find appropriate clothing to maintain body temperature, but comfortable and allow us to keep the correct technique: if the athlete is running, to keep the correct stroke and stride.
In case of warm up and mobility, we should consider that on cold days we tend to contract muscle fibers, so we should have to focus on warming up to prevent injuries.
CONCLUSIONS Cold temperatures can be great in sports performance, if we take care of the details.