Sagiv M, Ben-Sira D, Sagiv A, Werber G, Rotstein A
Life Sciences and Sports Medicine Department, Zinman College of Physical Education, Wingate, Israel.
Med Sci Sports Exerc. 1994 Mar;26(3):285-8.
This study examined with metabolic cart and echo-Doppler the influence of different load carriage during 4 h of treadmill walking on left ventricular systolic function, hemodynamics, and cardiovascular responses. Twenty-six aerobically well-trained male subjects (VO2max = 65.2 +/- 5 ml.kg-1.min-1) volunteered for this study. Subjects carried a load of 38 kg during one session and a load of 50 kg during the other session. Following the 4-h exercise in each session, significant (P < 0.05) differences were noted between the 38-kg and 50-kg workloads with regard to VO2: 14.4 +/- 2 and 19 +/- 5 ml.kg-1.min-1; heart rate: 104 +/- 14 and 125 +/- 17 beats.min-1; diastolic blood pressure: 69 +/- 4 and 79 +/- 4 mm Hg; and rate pressure product 140.4 +/- 15 and 173.8 +/- 20 index.10(-2), respectively. No significant differences were noted between the workloads in regard to systolic blood pressure, perceived exertion rating, and aortic valve Doppler indices. We concluded that during prolonged treadmill walking in well-trained young subjects, the additional load above 50% up to 66% of body weight did not change the steady state of left ventricular systolic function, hemodynamics, and cardiovascular responses throughout the course of the 240 min of effort.
本研究使用代谢车和超声多普勒检查了在跑步机上行走4小时期间不同负重对左心室收缩功能、血流动力学和心血管反应的影响。26名有氧训练良好的男性受试者（最大摄氧量=65.2±5 ml·kg⁻¹·min⁻¹）自愿参与本研究。受试者在一个时间段内负重38千克，在另一个时间段内负重50千克。在每个时间段进行4小时运动后，38千克和50千克工作量之间在以下方面存在显著（P<0.05）差异：最大摄氧量分别为14.4±2和19±5 ml·kg⁻¹·min⁻¹；心率分别为104±14和
