Toyohiro Hamaguchi

Biographic Data

ID8873692
NAMEToyohiro Hamaguchi
GIVEN NAMESToyohiro
FAMILY NAMEHamaguchi
SIGNATUREHAMAGUCHI T
AFFILIATIONSSaitama Prefectural University
ORCID0000-0001-5645-0439
VERIFIEDYes
TOTAL WORKS5
TOTAL CITATIONS0
WORKS AS AUTHOR5
WORKS AS EDITOR0
FIRST PUBLICATION YEAR2008
LATEST PUBLICATION YEAR2014
H-INDEX0

  • Gastrointestinal specific anxiety in irritable bowel syndrome

    Open AccessTatsuo Saigo, Jun Tayama et al.ARTICLEBioPsychoSocial Medicine2014

    OBJECTIVE: The visceral sensitivity index (VSI) is a useful self-report measure of the gastrointestinal symptom-specific anxiety (GSA) of patients with irritable bowel syndrome (IBS). Previous research has shown that worsening GSA in IBS patients is related to the severity of GI symptoms, suggesting that GSA is an important endpoint for intervention. However, there is currently no Japanese version of the VSI. We therefore translated the VSI into …

  • Effects of Preceding Stimulation on Brain Activation in Response to Colonic Distention in Humans

    Toyohiro Hamaguchi, Michiko Kano et al.ARTICLEPsychosomatic Medicine2013

    OBJECTIVE: It has been suggested that the pattern of distension (moderate following mild and vice versa) might influence brain activation and the experience of hypersensitivity, offset analgesia, and anticipation. Nevertheless, how the pattern of stimulation affects sensitization and/or desensitization to visceral stimulation remains unknown. METHODS: In 45 nonclinical healthy participants (12 women, 33 men; 20-26 years old), brain processing of …

  • Effects of personality traits on the manifestations of irritable bowel syndrome

    Open AccessJun Tayama, Naoki Nakaya et al.ARTICLEBioPsychoSocial Medicine2012

    OBJECTIVE: Previous studies have reported that patients with irritable bowel syndrome (IBS) show high neuroticism. However, the precise association between the IBS subtypes and the degree of neuroticism in younger populations is largely unknown. We tested our hypothesis that subjects with diarrhea-predominant IBS may have a higher degree of neuroticism than subjects without IBS or those with other subtypes of IBS. We also verified the additional …

  • Brain Activation Associated With Changes in Heart Rate, Heart Rate Variability, and Plasma Catecholamines During Rectal Distention

    Hiroyuki Suzuki, Hideaki Suzuki et al.ARTICLEPsychosomatic Medicine2009

    Objective: To test the hypothesis that gut stimulation provokes autonomic arousal via activation of regional cerebral cortices. How the human brain processes interoceptive signals and forms initial autonomic arousal is one of the key questions to be answered in research on emotion. Methods: Twelve healthy males participated in this study. A barostat bag was inserted in the rectum and intermittently inflated with 0, 20, or 40 mm Hg at random for 8…

  • Changes in salivary physiological stress markers induced by muscle stretching in patients with irritable bowel syndrome

    Open AccessToyohiro Hamaguchi, Shin Fukudo et al.ARTICLEBioPsychoSocial Medicine2008

    BACKGROUND: Psychophysiological processing has been reported to play a crucial role in irritable bowel syndrome (IBS) but there has been no report on modulation of the stress marker chromogranin A (CgA) resulting from muscle stretching. We hypothesized that abdominal muscle stretching as a passive operation would have a beneficial effect on a biochemical index of the activity of the sympathetic/adrenomedullary system (salivary CgA) and anxiety. M…