Heart rate recovery (HRR) has been widely used to evaluate the integrity of the autonomic nervous system with a slower HRR being associated with greater cardiovascular risk. Different HRR indices have been proposed. Some evaluate HR changes from the end of exercise to a specific recovery moment (e.g. 60s - HRR60s; 120s - HRR120s; 300s - HRR300s) and others calculate time-constant decays of HR for different recovery intervals (e.g. first 30s - T30; the entire period - HRRt). Several studies have examined the reproducibility of these commonly-used HRR indices, but reported discordant findings. Thus, this systematic review was designed to synthesize the reproducibility of HRR. We included studies that evaluated short-term (<1 year) reproducibility of HRR after dynamic exercise by employing typical measures of reliability (intraclass correlation coefficient, ICC) and agreement (coefficient of variation, CV). The electronic database PubMed/Medline was searched for relevant studies published up to July 2018. From the initial 120 records identified, 15 studies were retained for the qualitative synthesis of 24 experimental conditions. During most experimental conditions, high ICC and desirable CV were reported for HRR60s (62.5 and 76.2%, respectively), HRR120s (55.6 and 71.4%) and HRR300s (50.0 and 100.0%). While, it were reported during the minority of conditions for HRRt (37.5 and 42.9%) and in none condition for T30 (0.0 and 0.0%). In conclusion, HRR60s, HRR120s and HRR300s exhibited good reproducibility for evaluating HRR in predominantly healthy males within research and clinical settings. In contrast, caution should be taken when employing other HRR indices (T30, HRRt) due to their poorer reproducibility.

中文翻译：

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运动后心率恢复指数的可重复性：系统评价

心率恢复 (HRR) 已被广泛用于评估自主神经系统的完整性，心率恢复较慢与心血管风险较高有关。已经提出了不同的 HRR 指数。一些评估从运动结束到特定恢复时刻的 HR 变化（例如 60 秒 - HRR60 秒；120 秒 - HRR120 秒；300 秒 - HRR300 秒），而其他人计算不同恢复间隔（例如前 30 秒 - T30；整个期间-HRRt）。几项研究检查了这些常用 HRR 指数的可重复性，但报告的结果不一致。因此，本系统评价旨在综合 HRR 的可重复性。我们纳入了评估短期（< 1 年）通过采用典型的可靠性（组内相关系数，ICC）和一致性（变异系数，CV）度量，动态锻炼后 HRR 的可重复性。在电子数据库 PubMed/Medline 中搜索了截至 2018 年 7 月发表的相关研究。 从最初确定的 120 条记录中，保留了 15 条研究用于 24 种实验条件的定性合成。在大多数实验条件下，HRR60s（分别为 62.5% 和 76.2%）、HRR120s（55.6% 和 71.4%）和 HRR300s（50.0% 和 100.0%）报告了高 ICC 和理想的 CV。同时，在少数情况下报告了 HRRt（37.5 和 42.9%），而在 T30 无条件下（0.0 和 0.0%）。总之，HRR60s，HRR120 和 HRR300 在研究和临床环境中评估主要健康男性的 HRR 时表现出良好的重现性。相比之下，在使用其他 HRR 指数（T30、HRRt）时应谨慎，因为它们的可重复性较差。