Sheldahl L M, Wilke N A, Hanna R D, Dougherty S M, Tristani F E
VA Medical Center, Milwaukee, WI 53295, USA.
Eur J Appl Physiol Occup Physiol. 1996;72(4):357-64. doi: 10.1007/BF00599697.
The primary purpose of the present study was to determine oxygen uptake (VO2) and heart rate (HR) responses of patients with coronary artery disease (CAD) to common lawn-care activities. The study was conducted in three phases. In phase I, 8 men with CAD performed 30 min of push motorized lawn mowing at a self-paced rate. In phase II, 9 men with CAD performed push (no power) mowing, trimming (power and manual), and raking for 8 min each. In phase III, age-matched men and women with and without CAD (9-11 per group) performed self-propelled motorized mowing and push motorized mowing. In phase I, VO2 averaged 17.3 (SEM 3.8) ml.kg-1.min-1 during 30 min of mowing. Relative effort was 68 (SEM 1) and 76 (SEM 4)% of treadmill maximal VO2 (VO2max) and HR, respectively. In phase II, mean VO2 ranged from 8.6 (SEM 0.4) with grass trimming to 22.2 (SEM 1.6) ml.kg-1.min-1 with push manual mowing. With self-propelled mowing at three speeds in phase III, mean VO2 of the CAD groups ranged from 9.5 (SEM 0.3) to 13.8 (SEM 1.4) ml.kg-1.min-1 and represented 37%-62% VO2max. The results indicated that lawn mowing is often performed at an exercise intensity recommended for aerobic exercise training; patients who achieve a treadmill peak capacity of 4 times resting metabolic rate (4 METs) should be able to perform self-propelled motorized lawn mowing (slow speed) and grass trimming at less than 80% peak VO2; and VO2 demands of lawn mowing can be adjusted by equipment selection and/or pace.
本研究的主要目的是确定冠心病（CAD）患者对常见草坪护理活动的摄氧量（VO2）和心率（HR）反应。该研究分三个阶段进行。在第一阶段，8名CAD男性患者以自定速度进行30分钟的电动推式割草。在第二阶段，9名CAD男性患者分别进行推式（无动力）割草、修剪（电动和手动）和耙草，各持续8分钟。在第三阶段，年龄匹配的有CAD和无CAD的男性和女性（每组9 - 11人）进行自行式电动割草和电动推式割草。在第一阶段，割草30分钟期间VO2平均为17.3（标准误3.8）ml·kg-1·min-1。相对运动强度分别为跑步机最大摄氧量（VO2max）的68（标准误1）%和心率的76（标准误4）%。在第二阶段，平均VO2范围从修剪草坪时的8.6（标准误0.4）到推式手动割草时的22.2（标准误1.6）ml·kg-1·min-1。在第三阶段以三种速度进行自行式割草时，CAD组的平均VO2范围从9.5（标准误0.3）到13.8（标准误1.4）ml·kg-1·min-1，相当于VO2max的37% - 62%。结果表明，割草通常在有氧运动训练推荐的运动强度下进行；达到跑步机峰值能力为静息代谢率4倍（4梅脱）的患者应该能够以低于峰值VO2的80%进行自行式电动割草（慢速）和草坪修剪；并且割草的VO2需求可以通过设备选择和/或速度来调整。
