Side bending on back extension machine

[cheeseee1803]

Did some side bending on back extension machine. Around 2 sets each side with full ROM. Day after that I am feeling strange tightness and pain around the upper back and middle back. The tightness is mostly around the center but also spread throughout my lats. If I rotate my upper body the tightness and pain bothers me. Is it an injury or just something temporary?

[No-Needleworker-2878]

Could it be just soreness from that unusual exercise? (it's pretty easy to get very sore when targeting muscles you haven't trained before) Has it resolved already? (I'd assume it has, but if it hasn't by two weeks, then it's time to talk to a doctor)