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Figure 4. Cross-correlations between LH and T concentrations with GH, TSH, cortisol, and ACTH concentrations Results of the cross-correlation analyses between LH concentrations and a) GH, b) TSH, c) cortisol, and d) ACTH concentrations are plotted, together with the cross-correlations between total T concentrations and e) GH, f) TSH, g) cortisol, and h) ACTH concentrations. Cross-correlation assesses the relative strength between two hormone time series for all possible time shifts. The graph displays the correlation (y-axis) at a lag time in minutes (x-axis) with each grey line corresponding with one participant. The black line indicates the mean correlation for all participants and the two dark grey lines indicate the 95% confidence interval. The significance level is indicated by two straight dotted lines at correlations -0.18 and +0.18. Negative lag times represent a correlation in which hormone 2 is followed by hormone 1 and positive lag times represent a correlation in which hormone 1 is followed by hormone 2.

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