Mortac8, unless you used medical type pads (5"x8") or more than one pair of pads/channels, it’s impossible to stimulate all four quads:[ol]
[li]Vastus lateralis
[/li][li]Vastus intermedius
[/li][li]Rectus femoris
[/li][li]Vastus medialis
[/li][/ol]I believe no.3 is the only one attached to your hips thereby lifting your thigh.
Charlie, do you recommend stimulating all four?
ESTI, I believe you were the victim of DOMS (Delayed Onset of Muscle Soreness). If you used Active Recovery (AR), within a couple of hours from your training, you would not be as sore, and certainly not for 3 days. AR is a program specifically conceived to neutralize DOMS, present in the Compex and Globus machines but not in others to my knowledge. There is research (click here on relative article) and anecdotal proof (click here and read message 1526) that it works.
Charlie, I started digging in the subject of central fatigue, but the feedback I got so far is that it takes shorter than muscular fatigue to recover. Will dig further.