H-reflex and physiologic measures of ejaculation in men with spinal cord injury1  Frédérique Courtois, PhD, Robert Geoffrion, MSc, Éric Landry, MA, Marc Bélanger, PhD  Archives of Physical Medicine and Rehabilitation  Volume 85, Issue 6, Pages 910-918 (June 2004) DOI: 10.1016/j.apmr.2003.05.003

Fig 1 Sample recordings of (A) 1 non-SCI and (C) 1 SCI subject, along with an expanded tracing of the (B) non-SCI subject to match the time unit of the SCI subject. Abbreviations: PT, penile tumescence; BS, bulbocavernosus; RA, rectus abdominalis; HR, heart rate. Archives of Physical Medicine and Rehabilitation 2004 85, 910-918DOI: (10.1016/j.apmr.2003.05.003)

Fig 2 Cardiovascular changes in each subject as a function of sexual stimulation from baseline (B) to ejaculation (P0) and from 2 minutes (P2) to 20 minutes (P20) after ejaculation. Error bars correspond to standard errors (SEs) during the 5 repeated sessions in each subject. Abbreviation: BP, blood pressure. Archives of Physical Medicine and Rehabilitation 2004 85, 910-918DOI: (10.1016/j.apmr.2003.05.003)

Fig 3 H-reflex changes in each subject as a function of sexual stimulation from baseline (B) to ejaculation (P0) and from 2 minutes (P2) to 20 minutes (P20) after ejaculation. Error bars correspond to the SEs during the 5 repeated sessions in each subject. Archives of Physical Medicine and Rehabilitation 2004 85, 910-918DOI: (10.1016/j.apmr.2003.05.003)

Fig 4 A sample recording of (A) the muscular activity during a failure session. (B) The average changes in cardiovascular responses during the failure sessions. (C) The drops in H-reflex amplitude (from baseline to minimal H-reflex value) as consecutive bouts of stimulation were attempted during the failure sessions. (D) A histogram that illustrates the drops in H-reflex on successful sessions (S) and on successive bouts of vibratory stimulation (F1 to F5) during failure sessions. Archives of Physical Medicine and Rehabilitation 2004 85, 910-918DOI: (10.1016/j.apmr.2003.05.003)