International Scholarly Research Notices

Research Article

The GH/IGF-I Axis and Cognitive Changes across a 4-Year Period in Healthy Adults

Table 1

Mean mood and memory performance scores (±SD) for the low (; mean IGF-I = 13.8 nmol/L) and high (; mean IGF-I = 22.5 nmol/L) IGF-I groups. Higher scores for fatigue, mood total, and symbol-digit correspond to worse performance. Higher scores for the other tests correspond to better performance.


	Low IGF-I		High IGF-I
	Baseline	Session 2	Baseline	Session 2

Vigor	3.25 ± 0.8	3.48 ± 0.7	3.39 ± 0.91	3.23 ± 1.21
Fatigue	2.73 ± 0.65	2.52 ± 0.7	2.84 ± 0.95	2.77 ± 1.21
Mood total	1.51 ± 0.31	1.55 ± 0.3	1.64 ± 0.41	1.64 ± 0.62
Associate learning trial 1	4.33 ± 2.09	3.6 ± 1.96	3.37 ± 1.7	3.80 ± 2.21
Associate learning trial 2	5.0 ± 1.81	4.67 ± 2.44	4.8 ± 1.97	4.53 ± 2.1
Associate learning trial 3	6.2 ± 2.18	6.13 ± 1.64	5.2 ± 2.30	5.4 ± 1.80
Associate recall	6.4 ± 2.2	5.6 ± 2.77	5.13 ± 2.10	5.47 ± 2.39
Digit span forward	6.13 ± 1.64	6.0 ± 1.0	6.0 ± 1.56	5.53 ± 1.64
Digit span backward	5.47 ± 1.55	4.27 ± 1.22	4.93 ± 1.83	4.67 ± 1.44
Symbol-digit (error)	2.47 ± 5.54	1.6 ± 2.67	3.36 ± 4.74	1.45 ± 1.69
WM composite	9.8 ± 2.48	7.87 ± 2.10	8.67 ± 3.13	8.47 ± 2.47