Razz said:Hmm so Alexx you are saying that lifting close to 1RM with a rounded spine is not gonna make you more injury prone than lifting with a straight spine? Because what I see in those videos is bad form in my eyes but I may be wrong.
No no the spine rounding is a very separate technique/issue I was strictly referring to hip height.
The spine rounding issue is not necessarily bad technique either though and something that is done on purpose by certain powerlifters. It is in no way similar to a beginner rounding the lower back and doing all the lifting with their lower back without pushing the hips back. The reason for upper back/Thoracic region rounding is two fold - 1. it shortens the range of motion 2. It engages the upper back musculature more in the lift (whenever a muscle is stretched and contracted it is activated more). The reason why it is an acceptable technique is because the thoracic spine isn't the lower back it much sturdier with quite a bit more musculature to support it. Having said that it is something that requires a great deal of muscle control and is in no way shape or form similar to when a beginner rounds his back.
Also, this is not a technique that would be recommended for the average strength training trainee simply because it shifts the focus away from the legs and to the upper back which is often not the goal. If you are a powerlifter you don't care what you are working you just want to lift the most weight.
Bob Peoples (700 + deadlift RAW at 180) Konstantin Konstantinov (900 + deadlift RAW at 260+) and quite a few other notable powerlifters use this technique without any injuries. I am not recommending or defending the technique I am simply stating the fact that it is widely used and to brush it off as simply bad form would be ignorant when presented with the data.
Here is a picture of a guy's back who shift the focus to his upper back when he lifts, not the heavy upper back development and very little lower back hypertrophy: