Davies C T, Brotherhood J R, Collins K J, Doré C, Imms F, Musgrove J, Weiner J S, Amin M A, Ismail H M, El Karim M, Omer A H, Sukkar M Y
Br J Ind Med. 1976 Aug;33(3):181-6. doi: 10.1136/oem.33.3.181.
The thermal and exercise tolerances of 165 Sudanese cane cutters were measured in the laboratory and related to work performance and productivity in the cane fields. The results showed that the amount of cane cut per minute in the field was significantly correlated with changes in body weight (r = +0-53) during the third hour of work, aerobic energy expenditure (r = + 0-43), and cardiac frequency during work. These variables in turn were associated with predicted maximal power output (VO2 max) measured in the laboratory. The average energy expenditure during cane cutting was 1-66 +/- 0-33 1/min-1 (34-9 kJ/min-1) which represents approximately 60% of the workers predicted VO2 max. This rate of energy expenditure was sustained in the cane fields for at least three hours without significant pauses for rest. The sweat losses measured in 32 cane cutters during the two and three hours of work averaged 637 +/- 221 and 770 +/- 282 g/h-1 respectively, while the mean urine temperature immediately on cessation of effort was 37-74 +/- 0-46 degrees C. Despite the additional environmental heat load of the tropics, it would seem that cane cutters performing a self-paced task demanding heavy physical effort, are able to sustain work levels well in excess of those recommended for most European factory workers without obvious signs of fatigue or heat stress.
在实验室中测量了165名苏丹甘蔗砍伐工人的耐热性和运动耐力，并将其与甘蔗田中的工作表现和生产率相关联。结果表明，田间每小时砍伐甘蔗的数量与工作三小时期间体重变化（r = +0.53）、有氧能量消耗（r = +0.43）以及工作时的心率显著相关。这些变量又与在实验室中测得的预测最大输出功率（最大摄氧量）相关。砍甘蔗期间的平均能量消耗为1.66±0.33升/分钟（34.9千焦/分钟），约占工人预测最大摄氧量的60%。这种能量消耗率在甘蔗田中持续至少三个小时，且没有明显的休息停顿。在32名甘蔗砍伐工人工作两小时和三小时期间测得的汗液流失量平均分别为637±221克/小时和770±282克/小时，而停止工作后立即测量的平均尿温为37.74±0.46摄氏度。尽管热带地区有额外的环境热负荷，但似乎从事需要大量体力的自主节奏任务的甘蔗砍伐工人能够维持远超大多数欧洲工厂工人建议水平的工作强度，且没有明显的疲劳或热应激迹象。
