Our study shows a significant increase in S100B level after PSG compared to before. This suggests that there is a CNS astrocyte reaction because of possible cerebral hypoxemia in morbidly obese patients with OSAHS.

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Incorrect use of proprioceptive neuromuscular facilitation-techniques and principles, a response to: Proprioceptive neuromuscular facilitation training improves pain-related and balance outcomes in working-age patients with chronic low back pain: a randomized controlled trialFirst we like to compliment the authors on their efforts for addressing the issue to determine the long term effects of PNF-training in patients with chronic low back pain. 1 Nevertheless we need to address some remarks and comments in the hope the authors can clarify and provide some further details.In the method the PNF training protocol is described as: ''modified from the studies of Areeudomwong et al. '' 2 This study in turn is describing the method as ''modified from the studies of Kofotolis and Kellis 3 and Voight et al. '' 4 The description is illustrated with photos, the Figures 1a, b and c. The illustrations and the description of the techniques are not synchronized.Described by the authors is in week 1: ''. . .to alternate isometric contractions. . .. . ..'' Isometric is defined as: ''tension built up in a muscle, but the muscle neither shortens nor lengthens''. 5 Hence no movement is intended during this technique: ''Rhythmic Stabilization'', in which a grip on both sides is required to address also the antagonists without movement. 6---8 The description in the text and the picture connects more to a grip variation fitting to the technique ''Stabilizing reversal'' in which one needs a change of hands to facilitate the alternating muscle activation of agonists and antagonists. 6 Week 2 is described as: ''. . ..alternating concentric and eccentric contractions of trunk agonistic muscles . . .'' this means that there is a consistent resistance for the agonists, in this case either the flexors or the extensors. Concentric contractions are defined as contractions in which the muscle generates force as it shortens and eccentric contractions, in which the muscle generates force as it lengthens. 5

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Comparison of the acute effects of the pnf and stabilization methods (fifa 11+) on the dynamic balance of university football athletes