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Miyazaki H, Nishio Y, Miyahara K, Furutani C, Xu Z, Saeki N, Tsuji T, Okada Y. Repetitive pain experiences modulate feedforward control of hemodynamics and modification by nitrous oxide/oxygen inhalation in humans. Heliyon 2023; 9:e23121. [PMID: 38144355 PMCID: PMC10746490 DOI: 10.1016/j.heliyon.2023.e23121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2023] [Revised: 11/22/2023] [Accepted: 11/27/2023] [Indexed: 12/26/2023] Open
Abstract
Background Repetitive experiences of certain stresses evoke feedforward cardiovascular responses via central command (CC)--central signals from the higher brain. However, it is unclear whether the anticipatory cardiovascular responses before pain stimulation occur after repetitive pain experiences and how nitrous oxide/oxygen inhalation (N2O), a sedative widely used in dentistry, affects the responses. We tested the hypothesis that the repetitive cold pressor test (CPT) alters the anticipatory cardiovascular responses, which are attenuated by N2O. Materials and methods Beat-to-beat systolic (SBP) and diastolic blood pressure (DBP), heart rate (HR), and finger arterial stiffness (β-stiffness) were measured during the 5-min rest, 30-s countdown (CD) before CPT, 2-min CPT, and 3-min recovery (CPT[1st]) in 15 young adults [age, 28 ± 4 years]. The same protocols were repeated randomly with the second CPT (CPT + CC) or placebo test (PLCB + CC). Results SBP and DBP increased from baseline in CPT[1st] and CPT + CC under room air (RA) and 40 % N2O, while SBP was lower under N2O than under RA in CPT[1st]. HR in CPT[1st] was lower under N2O than under RA. The change (Δ) in HR was smaller during CPT[1st] than during CPT + CC under N2O, and a similar trend was observed under RA. ΔSBP by CD was lower under N2O than under RA in CPT[1st] but not in CPT + CC. HR increased with CD in CPT + CC but not in CPT[1st] under both RA and N2O. β-stiffness increased by CD regardless of the pain experience, while it was lower under N2O. Conclusion Repetitive pain experiences induce a feedforward HR increase. 40 % N2O decreases vascular stiffness, which may attenuate the anticipatory pressor response only when the feedforward HR increase does not exist.
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Affiliation(s)
- Hironori Miyazaki
- Department of Special Care Dentistry, Hiroshima University, Hiroshima, Japan
| | - Yoshifumi Nishio
- Department of Special Care Dentistry, Hiroshima University, Hiroshima, Japan
| | - Kohta Miyahara
- Department of Special Care Dentistry, Hiroshima University, Hiroshima, Japan
| | - Chiaki Furutani
- Department of Special Care Dentistry, Hiroshima University, Hiroshima, Japan
| | - Ziqiang Xu
- Graduate School of Advanced Science and Engineering, Hiroshima University, Hiroshima, Japan
| | - Noboru Saeki
- Department of Anesthesiology, Hiroshima University, Hiroshima, Japan
| | - Toshio Tsuji
- Graduate School of Advanced Science and Engineering, Hiroshima University, Hiroshima, Japan
| | - Yoshiyuki Okada
- Department of Special Care Dentistry, Hiroshima University, Hiroshima, Japan
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Maximal Bite Force Measured via Digital Bite Force Transducer in Subjects with or without Dental Implants—A Pilot Study. APPLIED SCIENCES-BASEL 2022. [DOI: 10.3390/app12031544] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/10/2022]
Abstract
The aims of the current study were as following: (1) to evaluate the maximal bite forces in patients with dental implants versus patients without dental implants, as measured by a digital bite force transducer (GM10); (2) to evaluate the influences of sex, age, and sleep/awake bruxism on the maximal bite forces of the two groups. Forty patients recruited to the study were divided into two groups: test group (“implant”) if they had one or more posterior restored implants and control group (“no-implant”) without the presence of posterior dental implants. A digital bite fork (GM10) was used to measure the bite forces from three posterior occluding pairs in all participants. Differences in the mean values between the test and control groups and between different sexes were evaluated using one-way and two-way ANOVA tests. A cross-tabulation analysis was conducted to identify a trend line between the groups. There was no significant difference in the maximal bite force between the test and control groups (p = 0.422), but the cross-tabulation analysis revealed a clear trend of a stronger representation of the “no-implant” group at higher occlusal forces. A significant difference was detected between the maximal biting forces of male and female subjects (p = 0.030 in the implant group, p = 0.010 in the no-implant group), regardless of the experimental group. The presence of bruxism and clenching did not influence the bite force values (p = 0.953), and a significant difference was not found between the age groups (p = 0.393). Within the limitations of this study, it may be assumed that there was no significant difference between the maximal bite forces between patients with and without dental implants but that there was a trend line implicating a stronger representation of the “no-implant” group at higher forces. In addition, the results revealed a significant sex-related difference in the maximal occlusal force. Further studies with larger sample sizes are warranted.
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Manabe K, Masuki S, Ogawa Y, Uchida K, Kamijo YI, Kataoka Y, Sumiyoshi E, Takeda Y, Aida T, Nose H. Countdown before voluntary exercise induces muscle vasodilation with baroreflex-mediated decrease in muscle sympathetic nerve activity in humans. J Appl Physiol (1985) 2020; 128:1196-1206. [PMID: 32240023 DOI: 10.1152/japplphysiol.00523.2019] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
We examined whether a countdown (CD) before voluntary cycling exercise induced prospective vascular adjustment for the exercise and, if so, whether and how muscle sympathetic nerve activity (MSNA) was involved in the responses. Young men performed voluntary cycling in a semirecumbent position (n = 14) while middle cerebral artery blood flow velocity (VMCA; Doppler ultrasonography), heart rate (HR), arterial pressure (AP; finger photoplethysmography), oxygen consumption rate (V̇o2), oxygen saturation in the thigh muscle (StO2; near-infrared spectrometry), cardiac output (CO; Modelflow method), and total peripheral resistance (TPR) were measured (experiment 1). Another group underwent the same exercise protocol but used only the right leg (n = 10) while MSNA (microneurography) was measured in the peroneal nerve of the left leg (experiment 2). All subjects performed eight trials with a ≥5-min rest between trials. In four trials randomly selected from the eight trials, exercise onset was signaled by a 30-s CD, whereas in the remaining four trials, exercise was started without CD. We found that CD first increased VMCA, HR, CO, and mean AP, and then decreased TPR and increased StO2 and V̇o2 (experiment 1; all P < 0.021). Furthermore, the CD-induced increase in mean AP decreased total MSNA and burst frequency (experiment 2; both P < 0.048) through the baroreflex, with decreased TPR and increased StO2 (experiment 2; both P < 0.001). The vasodilation and increased V̇o2 continued after the start of exercise. Thus CD before starting exercise induced the muscle vasodilatory response with a concomitant reduction in MSNA through the baroreflex to accelerate aerobic energy production after the start of exercise.NEW & NOTEWORTHY Prospective cardiovascular adjustment occurs before starting voluntary exercise, increasing heart rate and arterial pressure followed by muscle vasodilation; however, the precise mechanisms and significance for this vasodilation remain unknown. We found that during the countdown before starting exercise cerebral blood flow velocity increased, followed by increases in heart rate and arterial pressure, which suppressed MSNA through baroreflex, resulting in thigh muscle vasodilation to increase oxygen consumption rate, which might make it easier to start exercise.
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Affiliation(s)
- Kazumasa Manabe
- Department of Sports Medical Sciences, Shinshu University Graduate School of Medicine, Matsumoto, Japan
| | - Shizue Masuki
- Department of Sports Medical Sciences, Shinshu University Graduate School of Medicine, Matsumoto, Japan.,Institute for Biomedical Sciences, Shinshu University, Matsumoto, Japan
| | - Yu Ogawa
- Department of Sports Medical Sciences, Shinshu University Graduate School of Medicine, Matsumoto, Japan
| | - Koji Uchida
- Department of Sports Medical Sciences, Shinshu University Graduate School of Medicine, Matsumoto, Japan
| | - Yoshi-Ichiro Kamijo
- Department of Sports Medical Sciences, Shinshu University Graduate School of Medicine, Matsumoto, Japan
| | - Yufuko Kataoka
- Department of Sports Medical Sciences, Shinshu University Graduate School of Medicine, Matsumoto, Japan
| | - Eri Sumiyoshi
- Department of Sports Medical Sciences, Shinshu University Graduate School of Medicine, Matsumoto, Japan
| | - Yu Takeda
- Department of Sports Medical Sciences, Shinshu University Graduate School of Medicine, Matsumoto, Japan
| | - Takamichi Aida
- Department of Sports Medical Sciences, Shinshu University Graduate School of Medicine, Matsumoto, Japan
| | - Hiroshi Nose
- Department of Sports Medical Sciences, Shinshu University Graduate School of Medicine, Matsumoto, Japan.,Institute for Biomedical Sciences, Shinshu University, Matsumoto, Japan
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Kawai E, Takeda R, Ota A, Morita E, Imai D, Suzuki Y, Yokoyama H, Ueda SY, Nakahara H, Miyamoto T, Okazaki K. Increase in diastolic blood pressure induced by fragrance inhalation of grapefruit essential oil is positively correlated with muscle sympathetic nerve activity. J Physiol Sci 2020; 70:2. [PMID: 32039689 PMCID: PMC6992548 DOI: 10.1186/s12576-020-00733-6] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2019] [Accepted: 12/30/2019] [Indexed: 11/10/2022]
Abstract
Fragrance inhalation of essential oils is widely used in aromatherapy, and it is known to affect blood pressure (BP) and heart rate (HR) via autonomic control of circulation. In this study, we aimed to test the hypothesis that the changes in hemodynamics with fragrance inhalation were observed along with changes in muscle sympathetic nerve activity (MSNA). In study 1, thirteen healthy men were exposed to fragrance stimulation of grapefruit essential oil for 10 min, and BP, HR, and MSNA were continuously measured. In study 2, another nine healthy men were exposed to the same fragrance stimulation; responses in BP and HR were continuously measured, and plasma noradrenaline and cortisol concentrations were determined. We found that diastolic BP increased significantly during fragrance inhalation, while the other variables remained unchanged in both studies. Although MSNA burst frequency, burst incidence, and total activity remained unchanged during fragrance inhalation, we found a significant linear correlation between changes in diastolic BP in the last 5 min of fragrance inhalation and changes in MSNA burst frequency. The plasma cortisol concentration decreased significantly at 10 min of fragrance inhalation, though the noradrenaline concentration remained unchanged. These results suggest, for the first time, that changes in BP with fragrance inhalation of essential oil are associated with changes in MSNA even with decreased stress hormone.
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Affiliation(s)
- Eriko Kawai
- Department of Environmental Physiology for Exercise, Osaka City University Graduate School of Medicine, 3-3-138 Sugimoto Sumiyoshi, Osaka, 558-8585, Japan
| | - Ryosuke Takeda
- Research Center for Urban Health and Sports, Osaka City University, Osaka, Japan
| | - Akemi Ota
- Department of Environmental Physiology for Exercise, Osaka City University Graduate School of Medicine, 3-3-138 Sugimoto Sumiyoshi, Osaka, 558-8585, Japan
| | - Emiko Morita
- Department of Environmental Physiology for Exercise, Osaka City University Graduate School of Medicine, 3-3-138 Sugimoto Sumiyoshi, Osaka, 558-8585, Japan
| | - Daiki Imai
- Department of Environmental Physiology for Exercise, Osaka City University Graduate School of Medicine, 3-3-138 Sugimoto Sumiyoshi, Osaka, 558-8585, Japan.,Research Center for Urban Health and Sports, Osaka City University, Osaka, Japan
| | - Yuta Suzuki
- Department of Environmental Physiology for Exercise, Osaka City University Graduate School of Medicine, 3-3-138 Sugimoto Sumiyoshi, Osaka, 558-8585, Japan.,Research Center for Urban Health and Sports, Osaka City University, Osaka, Japan
| | - Hisayo Yokoyama
- Department of Environmental Physiology for Exercise, Osaka City University Graduate School of Medicine, 3-3-138 Sugimoto Sumiyoshi, Osaka, 558-8585, Japan.,Research Center for Urban Health and Sports, Osaka City University, Osaka, Japan
| | - Shin-Ya Ueda
- Department of Physical Education, Faculty of Education, Gifu University, Gifu, Japan
| | - Hidehiro Nakahara
- Graduate School of Health Sciences, Morinomiya University of Medical Sciences, Osaka, Japan
| | - Tadayoshi Miyamoto
- Department of Sport and Health Sciences, Faculty of Sport and Health Sciences, Osaka Sangyo University, Daito, Osaka, Japan
| | - Kazunobu Okazaki
- Department of Environmental Physiology for Exercise, Osaka City University Graduate School of Medicine, 3-3-138 Sugimoto Sumiyoshi, Osaka, 558-8585, Japan. .,Research Center for Urban Health and Sports, Osaka City University, Osaka, Japan.
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Grinding to a halt: Stimulation of the trigeminal cardiac reflex from severe bruxism. HeartRhythm Case Rep 2018; 4:329-331. [PMID: 30112280 PMCID: PMC6092563 DOI: 10.1016/j.hrcr.2017.06.013] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2017] [Revised: 06/21/2017] [Accepted: 06/28/2017] [Indexed: 11/24/2022] Open
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Shoji I, Kemuriyama T, Tandai-Hiruma M, Maruyama S, Tashiro A, Yokoe H, Nishida Y. Reflex arc of the teeth clenching-induced pressor response in rats. J Physiol Sci 2018; 68:89-100. [PMID: 28035645 PMCID: PMC10717518 DOI: 10.1007/s12576-016-0513-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2016] [Accepted: 12/07/2016] [Indexed: 12/19/2022]
Abstract
Although "teeth clenching" induces pressor response, the reflex tracts of the response are unknown. In this study, dantrolene administration inhibited teeth clenching generated by electrical stimulation of the masseter muscles and completely abolished the pressor response. In addition, trigeminal ganglion block or hexamethonium administration completely abolished the pressor response. Local anesthesia of molar regions significantly reduced the pressor response to 27 ± 10%. Gadolinium (mechanoreceptor blocker of group III muscle afferents) entrapment in masticatory muscles also significantly reduced the pressor response to 62 ± 7%. Although atropine methyl nitrate administration did not change the pressor response, a significant dose-dependent augmentation of heart rate was observed. These results indicate that both periodontal membrane and mechanoreceptors in masticatory muscles are the receptors for the pressor response, and that the afferent and efferent pathways of the pressor response pass through the trigeminal afferent nerves and sympathetic nerves, respectively.
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Affiliation(s)
- Ichiro Shoji
- Department of Physiology, National Defense Medical College, Namiki 3-2, Tokorozawa, Saitama, 3598513, Japan.
- Department of Oral and Maxillofacial Surgery, National Defense Medical College, Tokorozawa, Saitama, Japan.
| | - Takehito Kemuriyama
- Department of Physiology, National Defense Medical College, Namiki 3-2, Tokorozawa, Saitama, 3598513, Japan
| | - Megumi Tandai-Hiruma
- Department of Physiology, National Defense Medical College, Namiki 3-2, Tokorozawa, Saitama, 3598513, Japan
| | - Satoshi Maruyama
- Pharmacochemical Section, Aeromedical Laboratory, Japan Air Self Defense Force, Tachikawa, Tokyo, Japan
| | - Akimasa Tashiro
- Department of Physiology, National Defense Medical College, Namiki 3-2, Tokorozawa, Saitama, 3598513, Japan
| | - Hidetaka Yokoe
- Department of Oral and Maxillofacial Surgery, National Defense Medical College, Tokorozawa, Saitama, Japan
| | - Yasuhiro Nishida
- Department of Physiology, National Defense Medical College, Namiki 3-2, Tokorozawa, Saitama, 3598513, Japan
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Ogawa Y, Kamijo YI, Ikegawa S, Masuki S, Nose H. Effects of postural change from supine to head-up tilt on the skin sympathetic nerve activity component synchronised with the cardiac cycle in warmed men. J Physiol 2016; 595:1185-1200. [PMID: 27861895 DOI: 10.1113/jp273281] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2016] [Accepted: 10/31/2016] [Indexed: 11/08/2022] Open
Abstract
KEY POINTS Humans are unique in controlling body temperature in a hot environment by a large amount of skin blood flow; however, the decrease in total peripheral resistance due to systemic cutaneous vasodilatation and the reduction of venous return to the heart due to blood pooling in the cutaneous vein threatens blood pressure maintenance in the upright position, and occasionally causes heat syncope. Against this condition, cutaneous vasodilatation is reportedly suppressed to maintain arterial pressure; however, the nerve activity responsible for this phenomenon has not been identified. In the present study, we found that the skin sympathetic nerve activity component that was synchronised with the cardiac cycle increased in hyperthermia, but the increase was suppressed when the posture was changed from supine to head-up tilt. The profile of the component agreed with that of cutaneous vasodilatation. Thus, the component might contribute to the prevention of heat syncope in humans. ABSTRACT In humans, the cutaneous vasodilatation response to hyperthermia has been suggested to be suppressed by baroreflexes to maintain arterial pressure when the posture is changed from supine to upright, and if the reflexes do not function sufficiently, it can cause heat syncope. However, the efferent signals of the reflexes have not been identified. To identify the signals, we continuously measured skin sympathetic nerve activity (SSNA; microneurography), right atrial volume (RAV; echocardiography, the baroreceptors for the reflexes are reportedly located in the right atrium), cutaneous vascular conductance on the chest (CVCchest ; laser Doppler flowmetry), and oesophageal temperature (Toes ; thermocouple) in young men before and after passive warming with a perfusion suit, during which periods the posture was changed from supine to 30 deg head-up tilt positions. During these periods, we also simultaneously measured muscle sympathetic nerve activity (MSNA) to distinguish the SSNA from MSNA. We found that an increase in Toes by ∼0.7°C (P < 0.0001) increased the total SSNA (P < 0.005); however, the head-up tilt in hyperthermia did not change the total SSNA (P > 0.26) although an increase in CVCchest (P < 0.019) was suppressed and RAV was reduced (P < 0.008). In contrast, the SSNA component synchronised with the cardiac cycle increased in hyperthermia (P < 0.015), but decreased with the postural change (P < 0.017). The SSNA component during the postural change before and after warming was highly correlated with the CVCchest (r = 0.817, P < 0.0001), but the MSNA component was not (r = 0.359, P = 0.085). Thus, the SSNA component synchronised with the cardiac cycle appeared to be involved in suppressing cutaneous vasodilatation during postural changes.
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Affiliation(s)
- Yu Ogawa
- Department of Sports Medical Sciences, Shinshu University Graduate School of Medicine and Institute for Biomedical Sciences, Matsumoto, 390-8621, Japan
| | - Yoshi-Ichiro Kamijo
- Department of Sports Medical Sciences, Shinshu University Graduate School of Medicine and Institute for Biomedical Sciences, Matsumoto, 390-8621, Japan
| | - Shigeki Ikegawa
- Department of Sports Medical Sciences, Shinshu University Graduate School of Medicine and Institute for Biomedical Sciences, Matsumoto, 390-8621, Japan
| | - Shizue Masuki
- Department of Sports Medical Sciences, Shinshu University Graduate School of Medicine and Institute for Biomedical Sciences, Matsumoto, 390-8621, Japan
| | - Hiroshi Nose
- Department of Sports Medical Sciences, Shinshu University Graduate School of Medicine and Institute for Biomedical Sciences, Matsumoto, 390-8621, Japan
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Serra CM, Manns AE. Bite force measurements with hard and soft bite surfaces. J Oral Rehabil 2013; 40:563-8. [DOI: 10.1111/joor.12068] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/18/2013] [Indexed: 11/30/2022]
Affiliation(s)
- C. M. Serra
- Facultad de Odontología; Universidad de los Andes; Santiago Chile
| | - A. E. Manns
- Facultad de Odontología; Universidad de los Andes; Santiago Chile
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Iwata C, Abe C, Tanaka K, Morita H. Role of the vestibular system in the arterial pressure response to parabolic-flight-induced gravitational changes in human subjects. Neurosci Lett 2011; 495:121-5. [PMID: 21440600 DOI: 10.1016/j.neulet.2011.03.052] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2011] [Revised: 03/17/2011] [Accepted: 03/17/2011] [Indexed: 11/17/2022]
Abstract
Arterial pressure (AP) is known to fluctuate during parabolic-flight-induced gravitational changes in human subjects, increasing during hypergravity and decreasing during microgravity. In this study, we examined whether the vestibular system participates in the AP response to the gravitational changes induced by parabolic flight in human subjects. Eight subjects performed parabolic flights in a supine position as their AP was measured. Their vestibular inputs during the gravitational changes were reversibly masked by artificial electrical stimulation (galvanic vestibular stimulation, GVS). The AP responses during the parabolas were then compared between the GVS-off and GVS-on conditions. AP increased during hypergravity and decreased during microgravity. The AP responses at the onset of hypergravity and microgravity were abolished by GVS. These results indicate that the vestibular system elicits pressor and depressor responses during parabolic-flight-induced hypergravity and microgravity, respectively.
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Affiliation(s)
- Chihiro Iwata
- Department of Physiology, Gifu University Graduate School of Medicine, 1-1 Yanagido, Gifu 501-1194, Japan.
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