Journal
PSYCHIATRY RESEARCH
Volume 189, Issue 1, Pages 128-134Publisher
ELSEVIER IRELAND LTD
DOI: 10.1016/j.psychres.2010.12.005
Keywords
Auditory verbal learning test; Digit span; Finger tapping test; Sleep apnea; Chronic fatigue syndrome
Categories
Funding
- Ministry of Research, Culture and Superior Education of the Grand-Duchy of Luxembourg
- Fonds National de la Recherche Scientifique, F.N.R.S.
- SOMALCPE
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Although relating to very different concepts, sleepiness and fatigue are often confounded. However, both fatigue-associated conditions such as the chronic fatigue syndrome (CFS) and sleepiness-associated conditions such as the sleep apnea-hypopnea syndrome (SAHS) are associated with cognitive impairment with impaired attention, concentration and memory performances. Fifteen pure CFS patients, without primary sleep disorders or clinically relevant sleepiness, were compared to 15 untreated SAHS patients, without clinically relevant fatigue, and to 16 healthy controls of similar age. The auditory verbal learning test (AVLT), digit span, digit symbol and finger tapping test (FTT) were used as cognitive and behavioural measures. In addition we assessed daytime EEG spectral power and P300 evoked potentials. With exception for the digit span, all tests showed lower performances in patient groups. Recall on the AVLT did not differ between the two patient groups, but the digit and symbol spans showed more severe impairment in SAHS patients. Psychomotor performance on the FTT presented with slower hit rates in SAHS than in CFS. EEG theta power was highest in CFS patients. P300 latencies and amplitudes did not differ between groups. Fatigue- and sleepiness-associated conditions can both present with significant and objective impairment of cognitive functioning and behavioural motor performance. In our sample cognitive impairment and psychomotor performance were worse when associated to sleepiness in SAHS than with fatigue in CFS. (C) 2010 Elsevier Ireland Ltd. All rights reserved.
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