Post Graduation Program in Cardiology, Universidade Federal de São Paulo, São Paulo, SP, Brazil.
Clinics (Sao Paulo). 2013 Jul;68(7):960-7. doi: 10.6061/clinics/2013(07)12.
There are no data in the literature with regard to the acute effects of different styles of music on the geometric indices of heart rate variability. In this study, we evaluated the acute effects of relaxant baroque and excitatory heavy metal music on the geometric indices of heart rate variability in women.
We conducted this study in 21 healthy women ranging in age from 18 to 35 years. We excluded persons with previous experience with musical instruments and persons who had an affinity for the song styles. We evaluated two groups: Group 1 (n = 21), who were exposed to relaxant classical baroque musical and excitatory heavy metal auditory stimulation; and Group 2 (n = 19), who were exposed to both styles of music and white noise auditory stimulation. Using earphones, the volunteers were exposed to baroque or heavy metal music for five minutes. After the first music exposure to baroque or heavy metal music, they remained at rest for five minutes; subsequently, they were re-exposed to the opposite music (70-80 dB). A different group of women were exposed to the same music styles plus white noise auditory stimulation (90 dB). The sequence of the songs was randomized for each individual. We analyzed the following indices: triangular index, triangular interpolation of RR intervals and Poincaré plot (standard deviation of instantaneous beat-by-beat variability, standard deviation of the long-term RR interval, standard deviation of instantaneous beat-by-beat variability and standard deviation of the long-term RR interval ratio), low frequency, high frequency, low frequency/high frequency ratio, standard deviation of all the normal RR intervals, root-mean square of differences between the adjacent normal RR intervals and the percentage of adjacent RR intervals with a difference of duration greater than 50 ms. Heart rate variability was recorded at rest for 10 minutes.
The triangular index and the standard deviation of the long-term RR interval indices were reduced during exposure to both music styles in the first group and tended to decrease in the second group whereas the white noise exposure decreased the high frequency index. We observed no changes regarding the triangular interpolation of RR intervals, standard deviation of instantaneous beat-by-beat variability and standard deviation of instantaneous beat-by-beat variability/standard deviation in the long-term RR interval ratio.
We suggest that relaxant baroque and excitatory heavy metal music slightly decrease global heart rate variability because of the equivalent sound level.
目前尚无文献报道不同风格的音乐对心率变异性的几何指标的急性影响。本研究旨在评估放松的巴洛克式音乐和兴奋的重金属音乐对女性心率变异性的几何指标的急性影响。
我们招募了 21 名年龄在 18 至 35 岁之间的健康女性参与本研究。我们排除了有乐器演奏经验和对歌曲风格有偏好的人。我们评估了两组：第 1 组（n=21），暴露于放松的古典巴洛克音乐和兴奋的重金属听觉刺激；第 2 组（n=19），暴露于两种音乐风格和白噪声听觉刺激。志愿者使用耳机分别接受巴洛克或重金属音乐刺激 5 分钟。在首次接受巴洛克或重金属音乐刺激后，他们先休息 5 分钟，然后再接受相反的音乐（70-80dB）刺激。另一组女性接受相同的音乐风格加白噪声听觉刺激（90dB）。每个人的歌曲顺序都是随机的。我们分析了以下指标：三角指数、RR 间期三角插值和 Poincaré 图（瞬时逐拍变异性的标准差、长 RR 间期的标准差、瞬时逐拍变异性的标准差和长 RR 间期的标准差比、低频、高频、低频/高频比、所有正常 RR 间期的标准差、相邻正常 RR 间期差值的均方根和 RR 间期差值大于 50ms 的百分比）。在 10 分钟的休息时间内记录心率变异性。
第 1 组在接受两种音乐风格刺激时，三角指数和长 RR 间期指标的标准差降低，而第 2 组则倾向于降低，而白噪声刺激则降低了高频指标。RR 间期三角插值、瞬时逐拍变异性和瞬时逐拍变异性/长 RR 间期的标准差比的标准差没有变化。
我们认为放松的巴洛克式音乐和兴奋的重金属音乐由于等效声级的原因，略微降低了整体心率变异性。
