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Further evidence of a prolonged hypotensive and a bradycardic effect after mandibular extension in normal volunteers.
Archives Italiennes De Biologie ( IF 1 ) Pub Date : 2017-3-18 , DOI: 10.12871/00039829201645
C Del Seppia 1 , S Ghione , Paola Foresi , E Fommei , D Lapi , A Colantuoni , R Scuri
Affiliation  

We previously reported that in normotensive humans submaximal mouth opening (mandibular extension) obtained by an ad hoc dilator (spring device), associated with partial masticatory movements and prolonged for 10 minutes is followed by a long-lasting reduction of blood pressure (BP) and heart rate (HR). Similar results were obtained by us in anesthetized rats. A recent independent study failed to confirm the results in the normotensive human. We reassessed, in 25 normotensive volunteers, the effects on BP and HR of mandibular extension obtained by the spring device associated with partial masticatory movements compared to a control procedure, consisting in keeping a tongue depressor between the incisor teeth. Both procedures were applied for 10 minutes and systolic BP (SBP), diastolic BP (DBP) and HR were measured every 10 minutes by an automatic recorder, for 30 minutes before and 120 minutes after the procedures in seated subjects watching nature documentary films on laptop screen.Baseline levels (mean of the last 3 measurements before procedure) did not significantly differ between the experimental and control sessions. Two way repeated measures ANOVA on absolute (recorded) values did not reveal a significant main effect of treatment for SBP, DBP and HR, but a significant main effect of time (P<0.001) for BP and HR. In addition, a significant interaction of time and treatment was found for SBP (P<0.001) and DBP (P=0.005), but not for HR. In addition, two way repeated measures ANOVA was done on changes from baseline obtaining a significant main effect of treatment (P<0.001) and time (P<0.001) and a significant interaction of time and treatment for SBP (P<0.001) and DBP (P<0.01). Post-hoc comparisons revealed significantly lower values for SBP and DBP in experimental compared to control values at almost all times and this decrement was by about 5 mmHg. Furthermore, for both absolute values and changes from baseline, the interaction effect was, for BP, of a qualitative type as indicated by an opposite effect in the time-course between control and experimental sessions. This study thus provides confirmatory evidence that submaximal mouth opening for a relatively brief time is followed by prolonged albeit small reductions of BP in normotensive human volunteers.

中文翻译:

在正常志愿者中,下颌伸展后长期降压和心动过缓的进一步证据。

我们以前曾报道过,在正常血压的人中,通过特制的扩张器(弹簧装置)获得的最大张口(下颌伸展)与部分咀嚼运动有关,并延长了10分钟,之后血压持续降低(BP),心率(HR)。我们在麻醉大鼠中获得了相似的结果。最近的一项独立研究未能证实在血压正常的人中的结果。我们在25名血压正常的志愿者中重新评估了与控制程序相比,通过弹簧装置获得的与部分咀嚼运动相关的下颌伸展对BP和HR的影响,其中包括在切牙之间保持压舌板。两种手术均施行10分钟,然后进行收缩压(SBP),用自动记录仪每10分钟测量一次舒张压BP(DBP)和心率,在坐着的受试者在笔记本电脑屏幕上观看自然纪录片的过程中,分别在手术前30分钟和手术后120分钟测量基线水平(手术前最近3次测量的平均值)在实验和对照阶段之间没有显着差异。对绝对(记录)值的两种方法重复测量ANOVA并未显示出SBP,DBP和HR的治疗有明显的主要作用,而BP和HR的时间却有显着的主要作用(P <0.001)。此外,对于SBP(P <0.001)和DBP(P = 0.005),发现时间和治疗之间存在显着的交互作用,而对于HR,则没有。另外,对基线的变化进行了两种方法的重复测量方差分析,获得了显着的主要治疗效果(P <0.001)和时间(P <0)。001)和时间与治疗SBP(P <0.001)和DBP(P <0.01)的显着相互作用。事后比较显示,在几乎所有时间,实验中的SBP和DBP值均显着低于对照值,并且减少了约5 mmHg。此外,对于绝对值和相对于基线的变化,对于BP而言,相互作用的影响是定性类型,如对照和实验之间的时间过程中的相反作用所表明。因此,这项研究提供了确证性的证据,即在血压正常的志愿者中,在相对短的时间内张大嘴巴会导致长时间的BP降低,尽管持续时间很小。事后比较显示,在几乎所有时间,实验中的SBP和DBP值均显着低于对照值,并且减少了约5 mmHg。此外,对于绝对值和相对于基线的变化,对于BP而言,相互作用的影响是定性类型,如对照和实验之间的时间过程中的相反作用所表明。因此,这项研究提供了确证性的证据,即在血压正常的志愿者中,在相对短的时间内张大嘴巴会导致长时间的BP降低,尽管持续时间很小。事后比较显示,在几乎所有时间,实验中的SBP和DBP值均显着低于对照值,并且减少了约5 mmHg。此外,对于绝对值和相对于基线的变化,对于BP而言,相互作用的影响是定性类型,如对照和实验之间的时间过程中的相反作用所表明。因此,这项研究提供了确证性的证据,即在血压正常的志愿者中,在相对短的时间内张大嘴巴会导致长时间的BP降低,尽管持续时间很小。定性类型,如在对照组和实验组之间的时间过程中产生相反的影响。因此,这项研究提供了确证性的证据,即在血压正常的志愿者中,在相对短的时间内张大嘴巴会导致长时间的BP降低,尽管持续时间很小。定性类型,如在对照组和实验组之间的时间过程中产生相反的影响。因此,这项研究提供了确证性的证据,即在血压正常的志愿者中,在相对短的时间内张大嘴巴会导致长时间的BP降低,尽管持续时间很小。
更新日期:2020-08-21
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