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Fig. 1 | BMC Musculoskeletal Disorders

Fig. 1

From: Pain intensity and pressure pain thresholds after a light dynamic physical load in patients with chronic neck-shoulder pain

Fig. 1

Pain intensity during the provocation. The arm-cycling began with a load of 100 g for women and 200 g for men and then increased by 200 g every 10 min up to 500 g for women and 600 g for men respectively. The figure shows model based means of pain intensity (NRS). The mean standard errors (SE) for the estimated model means (LSmeans) were 0.50 for the control group and 0.34 for the group with chronic neck pain. In the figure time is represented by a category variable to allow for any kind of pattern over time. The pattern is close to a linear relationship, why we in the final analysis let time be a continuous variable. In the final analysis the interaction time*group was also statistically significant (p < 0.001) and hence the development of pain intensity over time were different for the two groups

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