Associations between locus coeruleus MRI contrast and physiological responses to acute stress in younger and older adults.

For LF power, we also found a significant phase (challenge-baseline) × age group interaction ( p = .012; Table 2 ) and a marginally significant phase (recovery-challenge) × age group interaction effect ( p = .066; Table 2 ); pairwise comparisons indicated significant baseline-to-challenge decreases and challenge-to-recovery increases in LF power for younger but not older participants ( Supplementary Results , Section 1 ).

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