Department of Speech, Language and Hearing Sciences, Purdue University, West Lafayette, Indiana 47907, USA.
J Voice. 2011 Sep;25(5):e215-9. doi: 10.1016/j.jvoice.2011.02.009. Epub 2011 Jun 25.
A core component of vocal hygiene programs is the avoidance of agents that may dry the vocal folds. Clinicians commonly recommend that individuals reduce caffeine intake because of its presumed dehydrating effects on the voice. However, there is little evidence that ingestion of caffeine is detrimental to voice production. The first objective of this study was to evaluate whether caffeine adversely affects voice production. The second objective was to evaluate if caffeine exacerbates the adverse phonatory effects of vocal loading.
Prospective, double-blinded, sham-controlled study.
Sixteen healthy adults participated in two sessions where they consumed caffeine (caffeine concentration=480 mg) or sham (caffeine concentration=24 mg) beverages. Voice measures (phonation threshold pressure and perceived phonatory effort) were collected. Subjects then completed a vocal loading challenge and voice measures were obtained again.
There were no significant differences in voice measures between the caffeine and sham conditions. Ingestion of caffeine did not adversely affect voice production (P>0.05) or exacerbate the detrimental phonatory effects of vocal loading (P>0.05).
Our findings contribute to emerging knowledge on the effects of caffeine on voice production. Recommendations to completely eliminate caffeine from the diet, as a component of a vocal hygiene program, should be evaluated on an individual basis.
嗓音卫生计划的一个核心组成部分是避免可能使声带变干的物质。临床医生通常建议减少咖啡因的摄入量，因为它对声音有潜在的脱水作用。然而，几乎没有证据表明摄入咖啡因对发声有不利影响。本研究的首要目的是评估咖啡因是否会对发声产生不良影响。第二个目的是评估咖啡因是否会加剧发声负荷对发音的不利影响。
前瞻性、双盲、假对照研究。
16 名健康成年人参加了两个会议，他们分别饮用含咖啡因（咖啡因浓度=480mg）或假（咖啡因浓度=24mg）的饮料。收集嗓音测量（发声阈压和感知发声努力）。然后，受试者完成发声负荷挑战，再次获取嗓音测量。
咖啡因和假条件之间的嗓音测量值没有显著差异。摄入咖啡因不会对发声产生不良影响（P>0.05），也不会加剧发声负荷对发音的不利影响（P>0.05）。
我们的研究结果有助于了解咖啡因对发声的影响。作为嗓音卫生计划的一部分，建议彻底消除饮食中的咖啡因，应该根据个人情况进行评估。
