There will be 3 groups of participants, an asymptomatic control group that will not perform any exercise and two groups of individuals with low back pain. One group will perform exercise at 90% VO2máx and the other at 60% VO2máx.~All the three groups will be assessed at baseline for pressure pain threshold, pain intensity, pain phenotype, disability, kinesiophobia, catastrophizing, anxiety and depression, physical activity, and aerobic capacity. In addition, pressure pain threshold and pain intensity will also be assessed at post-intervention.
The main objective of this study is:~• To evaluate the immediate hypoalgesic effect of an aerobic exercise session of different intensities in patients with chronic low back pain;~The secondary objective is:~• To explore whether pain intensity, level of physical activity, functionality, catastrophizing, kinesiophobia, anxiety and depression interfere with the immediate hypoalgesic effect of exercise.