The effects of exercise using an ergometer with swaying saddle on chronic lower back pain.
Seung Jin Byeon, Ki Hyun Kim
PMID 28533619WHAT IT FOUND
Pain and disability scores fell after the Belly-bike exercise in students with chronic lower back pain.
Flexibility scores also improved. With no control group, this does not show the bike caused the change.
Key findings
01After the intervention, pain and disability scores decreased significantly.
02Forward reaching and straight leg raising scores increased significantly.
03Rectus femoris and vastus lateralis activation increased significantly; erector spinae and gluteus medius activation did not.
STILL TO COME
How it was doneWhat they foundWhat it means for PTs
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What it does not show
There was no control group, so the before-and-after changes cannot be separated from the natural course of pain, expectation, or other changes over 8 weeks. No follow-up testing was conducted, so it is not known whether any change lasted after the intervention. The participants were described as university students, but Table 1 lists 11 men and 12 women and an age of 77.9 ± 6.3 years. The sample description is unclear. The paper says thirty-three students were recruited, but it does not clearly state how many completed the intervention or were analysed. The paper does not state which outcome was primary.
The easy way to misread this
Do not conclude that the Belly-bike caused the improvement. This was a single-group before-and-after study with no control group, no follow-up, and an unclear participant count, so the pain and disability scores could have changed for reasons other than the exercise.