After a a tough workout you may feel like your muscles are pumped up. In fact, they are. When you exercise your body must pump more blood and nutrients to the muscles being worked for them to perform properly. When your workout is complete, you will notice that your muscles gradually return back to normal.
The pumped up feeling you get after you exercise is caused by an increase in plasma within your muscles. This feeling will go away in as few as 30 minutes after you finish a weight-training session or it could take up to seven days for your muscles to return back to normal.
Increase In Blood
During exercise, your body must meet the increased demands for oxygen-rich blood. If you perform a vigorous exercise, you may notice your heart rate increase. This occurs because your body needs more blood to the muscles being used in order for them to work properly. This is why you feel a pumped-up feeling in your legs rather than your arms after performing leg exercises.
After you complete your workout and rest, your body no longer needs to send an increased amount of blood to that region of the body. Therefore, you feel that your muscles have deflated because the increased amount of blood that led to the pumped-up effect is no longer present.
Not A Permanent Feeling
Although we all wish our muscles would stay feeling pumped up after a workout, the truth is they will not. Although it is tempting to return to the gym the next day to get the pumped-up feeling again, it is important to allow your muscles to recover fully before working them out again.