Zeni A I, Hoffman M D, Clifford P S
Sports Performance and Technology Laboratory, Medical Colloege of Wisconsin, Milwaukee, USA.
JAMA. 1996 May 8;275(18):1424-7.
To compare the rates of energy expenditure at given rating of perceived exertion (RPE) levels among 6 different indoor exercise machines.
Repeated measures design.
Healthy young-adult volunteers, including 8 men and 5 women.
Subjects underwent a 4-week habituation period to become familiar with the RPE scale and exercise on an Airdyne, a cross-country skiing simulator, a cycle ergometer, a rowing ergometer, a stair stepper, and a treadmill. Following habituation, each subject completed an exercise test with each exercise machine. The exercise test comprised 3 stages of 5 minutes at self-selected work rates corresponding to RPE values of 11 (fairly light), 13 (somewhat hard), and 15 (hard). Oxygen consumption, from which the rate of energy expenditure was calculated, was measured during the last minute of each 5-minute exercise stage. Heart rate was measured during the last minute of each stage of the exercise test, and blood lactate levels were obtained immediately after each exercise stage.
Rate of energy expenditure at specified RPE values.
Rates of energy expenditure at a given RPE varied by 1093 kJ/h (261 kcal/h) for the exercise machines. The treadmill induced higher (P < .05) rates of energy expenditure for fixed RPE values than all other exercise machines. The cross-country skiing simulator, rowing ergometer, and stair stepper induced higher (P < .05) rates of energy expenditure than the Airdyne and cycle ergometer. Heart rate varied significantly (P < .01) among exercise machines, with the highest values associated with the treadmill and the stair stepper. Lactate concentration varied significantly (P = .004), with highest values associated with use of the stair stepper and the rowing ergometer.
Under the conditions of the study, the treadmill is the optimal indoor exercise machine for enhancing energy expenditure when perceived exertion is used to establish exercise intensity.
比较6种不同室内健身器材在给定自觉用力程度（RPE）水平下的能量消耗率。
重复测量设计。
健康的青年志愿者，包括8名男性和5名女性。
受试者经历为期4周的适应期，以熟悉RPE量表，并在风阻健身车、越野滑雪模拟器、自行车测力计、划船测力计、楼梯机和跑步机上进行锻炼。适应期过后，每位受试者使用每种健身器材完成一次运动测试。运动测试包括3个阶段，每个阶段5分钟，运动强度为自行选择，对应RPE值分别为11（相当轻松）、13（有点吃力）和15（吃力）。在每个5分钟运动阶段的最后一分钟测量耗氧量，并据此计算能量消耗率。在运动测试每个阶段的最后一分钟测量心率，每个运动阶段结束后立即检测血乳酸水平。
特定RPE值下的能量消耗率。
对于不同的健身器材，在给定RPE值时，能量消耗率相差1093千焦/小时（261千卡/小时）。对于固定的RPE值，跑步机产生的能量消耗率高于所有其他健身器材（P < 0.05）。越野滑雪模拟器、划船测力计和楼梯机产生的能量消耗率高于风阻健身车和自行车测力计（P < 0.05）。不同健身器材之间的心率差异显著（P < 0.01），跑步机和楼梯机的心率最高。乳酸浓度差异显著（P = 0.004），楼梯机和划船测力计使用时的乳酸浓度最高。
在本研究条件下，当使用自觉用力程度来确定运动强度时，跑步机是增加能量消耗的最佳室内健身器材。
