According to Pop Photo. Might be something to it, as just about every active photog I know complains of either, shoulder, back or knee pain but mostly those that carry 'bazookas'; a 'bazooka' being a large focal length lens, i.e. 400mm and up. The others are those that bring the kitchen sink in their camera bag. I'm a minimalist; one body, one/two lenses, 2 batteries and filter kit and more often lately, since I no longer market my stuff, a nice little Panasonic Lumix
https://www.popphoto.com/gear/2014/06/photography-killing-you-health-tips-photographers
https://www.popphoto.com/gear/2014/06/photography-killing-you-health-tips-photographers