Okamoto Takanobu, Masuhara Mitsuhiko, Ikuta Komei
Institute of Health Science and Applied Physiology, Kinki Welfare University, Hyogo, Japan.
Clin Physiol Funct Imaging. 2006 Jan;26(1):39-44. doi: 10.1111/j.1475-097X.2005.00651.x.
The purpose of this study was to determine the differences in cardiovascular response between high-intensity eccentric (ECC) and concentric (CON) contractions, and to obtain the basic data applicable to resistance training in middle-aged and elderly individuals. The subjects who participated in this study were nine healthy men (age 24.1 +/- 1.3 years). ECC and CON were randomly selected, as each test consisted of a high-intensity (80% of peak torque) bout of 60 s of ECC and CON isokinetic contractions of the flexor carpi radialis. Systolic pressure (SBP), diastolic pressure (DBP) and heart rate (HR) during ECC and CON were measured using a Finometer. Mean arterial pressure (MAP) was calculated by SBP and DBP. Rate-pressure product (RPP) was calculated by SBP and HR. SBP, DBP, MAP and RPP during ECC were significantly smaller compared with CON. It is clear that cardiovascular response by high-intensity contraction is smaller in ECC than in CON. High-intensity ECC has been suggested to exert only small stress to the cardiovascular system. Thus, being a contraction mode it may be applicable to resistance training.
本研究的目的是确定高强度离心（ECC）收缩和向心（CON）收缩之间心血管反应的差异，并获取适用于中老年个体抗阻训练的基础数据。参与本研究的受试者为9名健康男性（年龄24.1±1.3岁）。ECC和CON是随机选取的，因为每项测试都包括一次高强度（峰值扭矩的80%）的60秒桡侧腕屈肌ECC和CON等速收缩。使用Finometer测量ECC和CON期间的收缩压（SBP）、舒张压（DBP）和心率（HR）。平均动脉压（MAP）由SBP和DBP计算得出。速率压力乘积（RPP）由SBP和HR计算得出。与CON相比，ECC期间的SBP、DBP、MAP和RPP显著更小。很明显，高强度收缩时ECC的心血管反应比CON小。高强度ECC已被认为对心血管系统仅施加较小的压力。因此，作为一种收缩模式，它可能适用于抗阻训练。
