do Amaral Joice Anaize Tonon, Guida Heraldo Lorena, Vanderlei Franciele Marques, Garner David Matthew, de Abreu Luiz Carlos, Valenti Vitor Engracia
Altern Ther Health Med. 2015 Sep-Oct;21(5):16-23.
Music has been proven to promote changes in cardiac autonomic modulation. However, it is not clear whether the effects of the auditory stimulation on heart rate variability (HRV) are dependent on its intensity.
The study intended to investigate the acute effects on the geometric HRV indices of auditory stimulation with heavy metal and baroque music using different intensities of auditory stimulation.
The study was a nonrandomized, clinical trial.
The study was conducted at the facility of the Faculty of Sciences of the São Paulo State University, on the campus in Marilia, Brazil.
Participants were 24 healthy women aged between 18 and 27 y.
HRV was recorded for each participant for 10 min at rest. Subsequently, participants were exposed to baroque or heavy metal music through an earphone. They were exposed to 3 equivalent sound levels-60-70 decibels (dB), 70-80 dB, and 80-90 dB-for 5 min in each intensity range. After the first session of baroque or heavy metal music, participants rested for an additional 5 min. Then they were exposed to the other musical style. The first style played for each musical period was randomly selected for all individuals and then the other style would be played automatically for the second session.
The HRV analysis was performed using the following geometrical methods: (1) the triangular index (RRtri), (2) the triangular interpolation of the RR interval histogram (TINN), and (3) the Poincaré plot, using SD1-the standard deviation of the instantaneous variability of the beat-to beat heart rate (HR), SD2-the standard deviation of the long-term, continuous, RR interval variability, and the SD1/SD2 ratio-the ratio between the short- and long-term variations among the RR intervals.
The classic baroque music by Johann Pachelbel, "Canon in D Major," did not induce significant changes in the geometric indices of HRV at 60-70 dB, 70-80 dB, or 80-90 dB. However, auditory stimulation with heavy metal music, using "Heavy Metal Universe" by Gamma Ray, decreased the RRtri, TINN, and SD2 at 2 specific sound pressures (60-70 dB and 80-90 dB).
Auditory stimulation with the selected baroque music did not alter cardiac autonomic modulation, but the selected, heavy metal style of music in the lower and higher intensities reduced the global component of HRV acutely.
音乐已被证明可促进心脏自主神经调节的变化。然而，尚不清楚听觉刺激对心率变异性（HRV）的影响是否取决于其强度。
本研究旨在使用不同强度的听觉刺激，调查重金属音乐和巴洛克音乐的听觉刺激对几何HRV指标的急性影响。
本研究为非随机临床试验。
研究在巴西马利亚市圣保罗州立大学理学院的设施内进行。
参与者为24名年龄在18至27岁之间的健康女性。
在静息状态下为每位参与者记录10分钟的HRV。随后，参与者通过耳机聆听巴洛克或重金属音乐。他们在每个强度范围内（60 - 70分贝（dB）、70 - 80 dB和80 - 90 dB）暴露于3个等效声级下5分钟。在第一阶段的巴洛克或重金属音乐播放后，参与者再休息5分钟。然后他们聆听另一种音乐风格。为所有个体随机选择每个音乐时段播放的第一种风格，然后自动播放另一种风格用于第二阶段。
使用以下几何方法进行HRV分析：（1）三角指数（RRtri），（2）RR间期直方图的三角插值（TINN），以及（3）庞加莱图，使用SD1（逐搏心率（HR）瞬时变异性的标准差）、SD2（长期、连续RR间期变异性的标准差）以及SD1/SD2比值（RR间期短程和长程变异之间的比值）。
约翰·帕赫贝尔的经典巴洛克音乐《D大调卡农》在60 - 70 dB、70 - 80 dB或80 - 90 dB时未引起HRV几何指标的显著变化。然而，使用伽马射线乐队的《重金属宇宙》进行的重金属音乐听觉刺激，在2个特定声压（60 - 70 dB和80 - 90 dB）下降低了RRtri、TINN和SD2。
所选巴洛克音乐的听觉刺激未改变心脏自主神经调节，但所选的较低和较高强度的重金属音乐风格会急性降低HRV的整体成分。
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