One of the more common electrical abnormalities seen in the heart is a heart block, in which conduction is blocked or delayed along some part of the cardiac

b. they impair judgment, which makes it more likely for people to engage in risky behavior.

these are common warning signs of overtraining syndrome:

washed-out feeling, tired, drained, lack of energy

mild leg soreness, general aches, and pains

pain in muscles and joints

sudden drop in performance

insomnia

headaches

decreased immunity (increased number of colds, and sore throats)

decrease in training capacity/intensity

moodiness and irritability

depression

loss of enthusiasm for the sport

decreased appetite

increased incidence of injuries.

a compulsive need to exercise