Commissaris D A, Toussaint H M
Amsterdam Spine Unit, Vrije Universiteit Amsterdam, The Netherlands.
Eur J Appl Physiol Occup Physiol. 1996;74(3):264-73. doi: 10.1007/BF00377449.
Five subjects performed a maximal exercise test of repetitive lifting and lowering, with a discontinuous protocol of incremental exercise (3 min) and relative rest (2 min). Exercise periods consisted of repetitive lifting and repetitive lifting and lowering at increasing movement frequencies. Relative rest periods consisted of ergometer cycling at a constant, low power output. An unexpected, dissociated, response of cardiovascular and pulmonary parameters was found: during relative rest, values for oxygen uptake, carbon dioxide production, pulmonary ventilation and tidal volume were significantly higher than during the preceding exercise periods, though exercise intensity was much lower. To our knowledge, such a response has not been reported in previous studies. Since the response could not be attributed to methodological or technical factors, it is hypothesized that the type of exercise itself impeded the optimal performance of the oxygen transporting system. The function of the pulmonary system could have been influenced by a high intra-abdominal pressure, the involvement of respiratory muscles in stabilizing trunk and head, a flexed trunk posture and the entrainment of respiratory frequency with movement frequency. More likely, the function of the cardiovascular system was hindered by a high blood pressure and high intramuscular pressures. Since this response occurred at low exercise intensities, optimal functioning of the cardiovascular and pulmonary system during daily activities of repetitive lifting and lowering could similarly be impeded. The hypotheses put forward could also explain the lower peak oxygen uptake reported during repetitive lifting, compared to running and cycling.
五名受试者进行了一项重复提起和放下的最大运动测试，采用了递增运动（3分钟）和相对休息（2分钟）的不连续方案。运动阶段包括以逐渐增加的运动频率进行重复提起以及重复提起和放下。相对休息阶段包括以恒定的低功率输出进行测力计骑行。研究发现了心血管和肺部参数的一种意外的、分离的反应：在相对休息期间，尽管运动强度低得多，但摄氧量、二氧化碳产生量、肺通气量和潮气量的值显著高于前一个运动阶段。据我们所知，以前的研究中尚未报道过这种反应。由于这种反应不能归因于方法或技术因素，因此推测运动本身的类型阻碍了氧运输系统的最佳性能。肺部系统的功能可能受到高腹内压、呼吸肌参与稳定躯干和头部、躯干弯曲姿势以及呼吸频率与运动频率同步的影响。更有可能的是，心血管系统的功能受到高血压和高肌肉内压的阻碍。由于这种反应发生在低运动强度下，因此在重复提起和放下的日常活动中，心血管和肺部系统的最佳功能可能同样会受到阻碍。提出的假设也可以解释与跑步和骑自行车相比，重复提起过程中报告的较低峰值摄氧量。
