This problem is more likely to occur after traveling beyond the normal distance and is most likely to show up when climbing a hill. The cure is to stop, cool down, take a break, and give the heart a chance to recover. Prevention can come from cycling at a slower pace or by training up to a higher fitness level. Muscle exhaustion is caused by burning up the energy stored in the muscles, sometimes called the bonk. If heart fatigue comes mostly from pushing too hard, this problem occurs mainly from pushing too far.
Symptoms are difficulty in pedaling, a desire to coast, and sometimes cramping.
The effects of muscle exhaustion can last more than one day. Take a break, ingest sugars, travel at a slower pace, and train up. Sometimes the sleeping position, an injury, or mild arthritis can be involved. Clothing, shoes, and parts of the bike can also be responsible. Very dry weather can cause skin cracking.