School of Human and Life Sciences, Canterbury Christ Church University, Kent, UK.
Sci Rep. 2021 Mar 5;11(1):5334. doi: 10.1038/s41598-021-84803-8.
Isometric exercise (IE) interventions are an effective non-medical method of reducing arterial blood pressure (BP). Current methods of prescribing and controlling isometric exercise intensity often require the use of expensive equipment and specialist knowledge. However, ratings of perceived exertion (RPE) may provide a more accessible means of monitoring exercise intensity. Therefore, the aim of this study was to assess the validity of a specific Isometric Exercise Scale (IES) during a continuous incremental IE test. Twenty-nine male participants completed four incremental isometric wall squat tests. Each test consisted of five 2-min stages of progressively increasing workload. Workload was determined by knee joint angle from 135° to 95°. The tests were continuous with no rest periods between the stages. Throughout the exercise protocol, RPE (IES and Borg's CR-10), heart rate and blood pressure were recorded. A strong positive linear relationship was found between the IES and the CR-10 (r = 0.967). Likewise, strong positive relationships between the IES and wall squat duration (r = 0.849), HR (r = 0.819) and BP (r = 0.841) were seen. Intra-class correlation coefficients and coefficients of variations for the IES ranged from r = 0.81 to 0.91 and 4.5-54%, respectively, with greater reliability seen at the higher workloads. The IES provides valid and reliable measurements of RPE, exercise intensity, and the changes in physiological measures of exertion during continuous incremental IE; as such, the IES can be used as an accessible measure of exercise intensity during IE interventions.
等长运动（IE）干预是一种降低动脉血压（BP）的有效非医学方法。目前，规定和控制等长运动强度的方法通常需要使用昂贵的设备和专业知识。然而，感知用力（RPE）评分可能提供了一种更易于监测运动强度的方法。因此，本研究的目的是评估一种特定的等长运动量表（IES）在连续递增等长运动测试中的有效性。29 名男性参与者完成了四项递增等长墙壁深蹲测试。每个测试都由五个 2 分钟的逐渐增加工作量阶段组成。工作量由膝关节角度从 135°到 95°决定。测试是连续的，没有阶段之间的休息时间。在整个运动方案中，记录 RPE（IES 和 Borg 的 CR-10）、心率和血压。IES 与 CR-10（r = 0.967）之间存在强烈的正线性关系。同样，IES 与墙壁深蹲持续时间（r = 0.849）、HR（r = 0.819）和 BP（r = 0.841）之间也存在强烈的正相关关系。IES 的组内相关系数和变异系数范围为 r = 0.81 到 0.91 和 4.5-54%，在更高的工作量下表现出更高的可靠性。IES 可提供连续递增等长运动期间 RPE、运动强度和生理用力变化的有效且可靠的测量值；因此，IES 可作为等长运动干预期间运动强度的一种易于使用的测量方法。
