Age-stratified cut-off points for the nocturnal penile tumescence measurement using Nocturnal Electrobioimpedance Volumetric Assessment (NEVA(®) ) in sexually active healthy men.

The current nocturnal penile tumescence (NPT) measurement is based on standard cut-off levels defined regardless of age. This study was conducted to provide age-stratified cut-off points for NPT measurement.

Forty sexually active healthy men between 20 and 60 years old were enrolled and divided equally into four groups defined by age (20-29, 30-39, 40-49 and 50-60 years. ). None of the candidates had sexual dysfunction or sleep disturbance or used supportive medication to enhance sexual function. Erectile function was evaluated by using the 5-item version of the international index of erectile function (IIEF-5). NPT was observed using the nocturnal electrobioimpedance volumetric assessment (NEVA(®) ). The NPT values of healthy men aged 20-60 years varied from 268. 7% to 202. 3%. The NPT differed significantly between age groups (P < 0. 0009); however, no significant differences between men aged 30-39 and 40-49 (P = 0. 593) were observed. Age was weakly associated with IIEF-5 scores (P = 0. 004), whereas a strong and negative correlation between age and NPT (P < 0. 0001) was found. IEF-5 scores were not significantly associated with NPT (P = 0. 95). Therefore, the standard values for NPT testing should be considered in the evaluation of the nocturnal penile activity of men of all ages.

Andrologia. 2015 Oct 25 [Epub ahead of print]

A Tok, O Eminaga, L Burghaus, J Herden, I Akbarov, U Engelmann, S Wille

Department of Urology, University Hospital of Cologne, Cologne, Germany. , Department of Urology, University Hospital of Cologne, Cologne, Germany. , Department of Neurology, University Hospital of Cologne, Cologne, Germany. , Department of Urology, University Hospital of Cologne, Cologne, Germany. , Department of Urology, University Hospital of Cologne, Cologne, Germany. , Department of Urology, University Hospital of Cologne, Cologne, Germany. , Department of Urology, University Hospital of Cologne, Cologne, Germany.

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