A hand gripping the handle of a simple or forearm crutch or crutches or the handlebars of a running bicycle, motorbike or quad or the shaft of a tennis racket during a tough match, is at a temperature exceeding 38° C. The hand transmits this heat to the object it grips, and said object has a temperature changing from an outdoor temperature mostly of 10 to 20°C to temperatures of about 38/39°C. The hand is in a vasodilatation condition, is sweating, is slippery, gets tired and has to provide a stronger grip. The muscles get tired, the hand becomes sore and there is a risk of cramps. The effort generated requires more and more effort and performance is degraded. Thanks to an air cooling system, known since the occurrence of internal combustion engines but applied here in an inverted manner so that the heat scattering vanes (4) are located discretely inside a vented tube represented by the handle of a simple or forearm crutch or crutches or the handlebars of a bicycle, motorbike or quad or the shaft of a tennis racket, the cooling is ensured in a simple manner and becomes more efficient when the action is strong and violent and thereby generates more unwanted heat to be scattered.
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