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While lumbar spine flexion is unavoidable it is modifiable. But we certainly need more research in this space. I've done about 10 data collection sessions over the past 3 weeks. Some thoughts below...1/
Two measure kinematics we place two sensors on the spine at T12 and S1. The difference between the two angles is then found. To help with comparing across people I express flexion as the % of max found during max forward bending. 2/
Standing upright is considered zero.
With a deadlift technique that feels strong and has an emphasis on hinging through my hips we see about 70% max flexion.
With a deadlift technique that feels strong and has an emphasis on hinging through my hips we see about 70% max flexion.
there is some variability in that style but not much. The weight is low because I do several data collection sessions at a time. With higher loads I'd guess we would see slightly more flexion 3/
If I try to severely restrict my flexion I can achieve >60% and I'd guess with training even less than 50%.
However, a big issue is that these sensors are measuring the thorax (T12). This is standard practice. If we put the top sensor lower (L2) we tend to see...4/
However, a big issue is that these sensors are measuring the thorax (T12). This is standard practice. If we put the top sensor lower (L2) we tend to see...4/
less of an ability to decrease spine flexion. I'd suggest that a lot of what looks like lumbar spine neutral is movement in the upper lumbar and thoracic region.
Regardless, it is certainly possible to reduce spine flexion if you want to
Regardless, it is certainly possible to reduce spine flexion if you want to
During the squat we again see around 60% max flexion but with huge variability. I tried not to flex but if I go deeper you will see a buttwink and an increase in flexion
Again, with training flexion can be reduced, not going as deep or even increasing your max flexion will decrease the % of max flexion obtained.
If you increase your max flexion that increases the denominator, thus a smaller percentage
If you increase your max flexion that increases the denominator, thus a smaller percentage
I personally believe that spine flexion during lifting is largely irrelevant for injury/pain causation. But, I think having the ability to change it might be helpful for temporary changes to decrease sensitivity....
I'd also suggest that technique matters but more for performance. Some people probably produce more force with a more rounded spine (perhaps it influences what the hip can do) and some people prefer less flexion.
Biomechanists and coaches have a huge performance role IMO.
Biomechanists and coaches have a huge performance role IMO.
