Center for Kinanthropology Research, Faculty of Physical Culture, Palacky University Olomouc, Czech Republic.
Int J Sports Med. 2010 Nov;31(11):768-72. doi: 10.1055/s-0030-1263141. Epub 2010 Sep 10.
Progressive increases in exercise intensity cause significant decreases in vagal activity (VA) until a critical point called the vagal threshold (TVA) is reached. This is where further increases in exercise intensity cause negligible change in VA. This study was designed to develop the algorithm for the TVA determination and to assess the effects of age and gender on its level. The sample consisted of 40 subjects who were divided according to age and gender into 4 groups with 10 subjects each: G1-Men age 25-31, G2-Men age 40-57, G3-Women age 24-28, and G4-Women age 43-56. The vagal responses were assessed by spectral analysis of the heart rate variability method while walking on a treadmill in a steady-state at intensities of 20-70% of the maximal heart rate reserve (MHRR). The mean intensity of 45% MHRR was suggested as the TVA level which is related neither to age nor gender. Heart rate related to TVA (TVA-HR) was affected by gender. High frequency power at TVA was influenced by age. The TVA-HR was considered to be a promising tool for the prescription of a safe level of physical activity for subjects with higher risks of health complications involving elevated sympathoadrenal activity during exercise.
运动强度的逐渐增加会导致迷走神经活动（VA）显著下降，直到达到一个称为迷走神经阈值（TVA）的临界点。此时，进一步增加运动强度对 VA 的变化影响不大。本研究旨在开发 TVA 测定算法，并评估年龄和性别对其水平的影响。样本由 40 名受试者组成，根据年龄和性别分为 4 组，每组 10 名：G1-年龄 25-31 岁的男性，G2-年龄 40-57 岁的男性，G3-年龄 24-28 岁的女性，和 G4-年龄 43-56 岁的女性。通过在跑步机上以稳定状态行走，在最大心率储备（MHRR）的 20-70%的强度下，通过心率变异性的频谱分析评估迷走神经反应。建议将 45% MHRR 的平均强度作为 TVA 水平，该水平与年龄和性别无关。与 TVA 相关的心率（TVA-HR）受到性别的影响。TVA 时的高频功率受年龄影响。TVA-HR 被认为是为涉及运动时交感肾上腺活性升高的健康并发症风险较高的受试者规定安全体力活动水平的有前途的工具。
