Hi, how often depends on your activity levels. Using the massage gun every couple of days is a good time frame to work on. You could use it once or twice a week too, depending on how much exercise you're doing. If you use the massage gun and it feels too sore, then leave it for a day and try again
When I use the gun on my Vastus Lat I sometimes get triggering of the muscle when I run over the anterior inferior part the muscle. Why is this. It’s more prominent after long runs
Hi, Well done on using the gun to loosen your quads after a run. Typically, we find the outer aspect of the muscles (lateral) can get "tight" with increased work, more so than the inside (medial) area, which is what could be causing the triggering and why you may be finding this with the longer runs. We also find that muscles can change on a daily basis depending on the activities you're doing, so sometimes the area may be sorer and other times it can feel ok.
We, unfortunately, can't comment on individual cases, so if the triggering is worrying you, we'd suggest getting an appointment with your healthcare professional to discuss.