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CHAPTER 4 hypersensitive subpopulation of sham-injured animals in light-treated and untreated groups. (e) CSSs are shown for the subpopulation of spinal cord injured animals in light-treated and untreated groups that were below the hypersensitivity threshold (referred to here as “normosensitive”). (f) CSSs are shown for the normosensitive subpopulation of sham-injured animals in light-treated and untreated groups. Green line indicates hypersensitivity threshold. Statistical comparisons between 2 groups (independent of time, black lines, CLMM); see Figure 4.2, Figure 4.4 and Figure 4.5 for n values at different time points for a-b, c-d and e-f respectively. Data is expressed as mean ± SEM (unless n = 1); * p < 0.05, ** p < 0.01, p value indicated for 0.05 < p < 0.1. See Figure 4.1 for abbreviations. Despite the absence of a significant effect of red light across the time points (p = 0.1 at 7-dpi), hypersensitive spinal cord injured animals showed the highest RSSs at 7-dpi compared to 1-dpi and 3-dpi (p ≤ 0.007, CLMM; Figure 4.4), while no time effect was observed for the SCI+670 group (p = 0.49) overall. This was most obviously at the Below-Level region in the SCI group (p < 0.01 compared to 1-dpi and 3-dpi, Wilcoxon rank sum test). However, in the SCI+670 group, RSSs were significantly increased at 5-dpi (p = 0.034 compared to 3-dpi, Wilcoxon rank sum test) and then significantly decreased at 7-dpi (p = 0.034 compared to 5-dpi, Wilcoxon rank sum test). The ipsilateral side displayed higher RSSs that was significant in the Above-Level region only (p = 0.0002) across all time points in both groups. Spinal cord injured animals always displayed the lowest RSSs in the Below-Level compared to the other two levels (p ≤ 1.9e-11), and the highest in the At-Level compared to the other two levels (p ≤ 8.8e-07), irrespective of treatment, side, and time. In sham-injured groups, insufficient animals developed hypersensitivity to perform detailed statistics analyses. In summary, these results indicate that red light treatment reduces the incidence of developing hypersensitivity over the first 5 days, however it has no significant impact on animals that do become hypersensitive following injury over this recovery period. 90PDF Image | Effects of Red Light Treatment on Spinal Cord Injury
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