It’s not unusual for weight room regulars to look forward to their turn on the bench press. Squats are another story. A study recently published in the journal Medicine & Science in Sports & Exercise suggests recovering from a leg day workout might not be the same as when your work upper body muscle groups.
 

A dozen healthy young males performed 5 sets of 2-minute maximal voluntary contractions using knee extensor muscles. They got 8 minutes of rest between sets. On another day, they did the same workout using elbow flexors.

The average decrease in a subject’s ability to contract muscles was 12% greater after training leg muscles. White total fatigue was greater on legs, peripheral fatigue was greatest when working the elbows.