Low back pain is considered one of the great global challenges in public health due to its high prevalence. Exercise have been shown to cause an increase in pain thresholds, through the effect known as exercise-induced hypoalgesia. Little is known about exercise-induced hypoalgesia induced by different modalities of exercise in low back pain, and its possible effects in lumbopelvic biomechanics. The goal of this clinical trial is to compare the effect of exercise-induced hypoalgesia after an isometric, aerobic and a sham/ placebo exercise in non-specific low back pain. The main questions it aims to answer are: * Does an isometric exercise intervention cause exercise-induced hypoalgesia in non-specific low back pain patients? * Is the effect of an isometric exercise intervention comparable to that of aerobic exercise? * Is a placebo/ sham intervention also effective to reduce pain thresholds in these patients? * Do healthy subjects show the same effects in pain thresholds as low back pain patients ? Participants will perform an isometric, aerobic and placebo/ sham exercise intervention in three different recording sessions. Before and after the interventions, pain intensity, pain-pressure thresholds and lumbopelvic biomechanical parameters during trunk flexion-extension will be recorded. Researchers will compare a group of low back pain patients to an age-, gender- and anthropometrics-matched control group of pain-free subjects to see if exercise-induced hypoalgesia is also observed when there is no low back pain diagnosis.
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Pain intensity
Timeframe: Day 1, before, after and 30 minutes past the first intervention. Day 8, before, after and 30 minutes past the second intervention. Day 15, before, after and 30 minutes past the third intervention.
Pain-pressure thresholds
Timeframe: Day 1, before, after and 30 minutes past the first intervention. Day 8, before, after and 30 minutes past the second intervention. Day 15, before, after and 30 minutes past the third intervention.
Trunk flexion-extension electromyography (EMG)
Timeframe: Day 1, before, after and 30 minutes past the first intervention. Day 8, before, after and 30 minutes past the second intervention. Day 15, before, after and 30 minutes past the third intervention.
Flexion-extension ratio (EMG)
Timeframe: Day 1, before, after and 30 minutes past the first intervention. Day 8, before, after and 30 minutes past the second intervention. Day 15, before, after and 30 minutes past the third intervention.
Maximum ranges of lumbar and pelvic flexion
Timeframe: Day 1, before, after and 30 minutes past the first intervention. Day 8, before, after and 30 minutes past the second intervention. Day 15, before, after and 30 minutes past the third intervention.
Trunk flexion-extension percentages of motion
Timeframe: Day 1, before, after and 30 minutes past the first intervention. Day 8, before, after and 30 minutes past the second intervention. Day 15, before, after and 30 minutes past the third intervention.
Time of maximum flexion
Timeframe: Day 1, before, after and 30 minutes past the first intervention. Day 8, before, after and 30 minutes past the second intervention. Day 15, before, after and 30 minutes past the third intervention.
Fear-avoidance beliefs
Timeframe: Day 1, before, after and 30 minutes past the first intervention. Day 8, before, after and 30 minutes past the second intervention. Day 15, before, after and 30 minutes past the third intervention.
Pain distribution and supra-threshold stimulation
Timeframe: Day 1, before and after the first intervention. Day 8, before and after the second intervention. Day 15, before and after the third intervention.