心悸是心律不齐的一种，它被描述为心电风暴。心悸可以是轻微的零星发作，也可以是危及生命的紧急情况。根据马里兰大学医学中心的研究，最常见的心悸类型是室上性心动过速。这种情况起源于心脏的上腔。镁和钙在维持健康的神经和肌肉功能方面扮演着重要的角色，而这些营养素的不平衡或缺乏会增加你患心悸的风险。
功能
镁和钙一起作用，在某些功能上相互平衡。镁发出肌肉放松的信号，而钙则提示肌肉收缩。两者对正常的神经功能也是必要的。你的神经使用钙将电神经冲动转化为跨越两个神经细胞之间空间的化学爆发，激活受体神经或肌肉。镁调节神经中的钙水平，防止过多的钙积累导致过度兴奋。
吸收
最佳的镁水平有助于你的身体吸收更多的钙。相反，根据《膳食补充剂健康专业指南》的作者Shawn M. Talbot博士的说法，当镁含量低时，钙的吸收就会受到影响，从而导致肌肉紧张、抽筋、疲劳和酸痛。The combined effect of calcium and magnesium imbalance on muscle and nerve tissue can result in nerve and muscle irritability. If that imbalance occurs in your heart, irregular rhythms and palpitations can result.
缺钙
严重的钙缺乏会导致各种健康影响，包括心率异常、抽搐和痴呆。据《营养年鉴》的作者John D. Kirschmann说，缺钙是很常见的，全世界有三分之二的成年人缺钙。As you age, your ability to absorb calcium diminishes. Excess calcium also occurs, particularly if you supplement heavily with calcium or use calcium supplements without taking additional magnesium to balance calcium levels in tissues. When this happens, calcium can accumulate in muscle tissue, including heart muscle, and lead to irregular contractions that you experience as a racing heart.
手术恢复
根据发表在2011年6月的《英国麻醉学杂志》上的一项研究，镁可以减少胸外科手术患者术后恢复过程中出现的心悸。In the study, doctors administered 5 mg of magnesium to participants during surgery and on each of the first two days following surgery. Results showed a 16.7 percent occurrence rate for supraventricular arrhythmia in the treatment group and 25 percent occurrence in a control group that did not receive the supplement. In participants at highest risk for arrhythmia, magnesium supplementation resulted in 11 percent occurrence compared to 53 percent in those in that subgroup who did not receive magnesium.