Åstrand Per-Olof, Hallbäck Inger, Hedman Rune, Saltin Bengt
J Appl Physiol (1985). 1963 May 1;18(3):619-622. doi: 10.1152/jappl.1963.18.3.619.
Blood was drawn from cross-country skiers at 1–3 min after the finish in competitions on distances from 10 to 85 km and the blood lactate determined. Despite a maximal effort of the skiers, accentuated at the end of the race, there was a successive decrease in the blood lactate concentration with work time. After a 10-km race, work time 35–36 min, the average was 139 mg/100 ml of blood (12.5 mEq/liter); after a 30-km race, with a time of 1 hr 50 min-1 hr 56 min, the mean value was 68 mg/100 ml (6.1 mEq/liter); and after a 50-km race, work time 3 hr 6 min-3 hr 18 min, 39 mg/100 ml (3.5 mEq/liter). A lactate concentration exceeding 100 mg/100 ml is a common finding after maximal muscular exercise involving large muscles. The explanation for the low values after prolonged maximal work, indicating a different kind of fatigue, is presently obscure. Data are presented on the oxygen uptake attained during skiing at actual racing speed (average Vo2 = 4.45 liters/min).
在10至85公里越野滑雪比赛结束后1至3分钟，采集越野滑雪运动员的血液并测定血乳酸。尽管滑雪运动员在比赛过程中全力以赴，尤其是在比赛接近尾声时更是如此，但随着运动时间的增加，血乳酸浓度却持续下降。10公里比赛，用时35 - 36分钟，血乳酸平均浓度为139毫克/100毫升血液（12.5毫当量/升）；30公里比赛，用时1小时50分钟至1小时56分钟，平均值为68毫克/100毫升（6.1毫当量/升）；50公里比赛，用时3小时6分钟至3小时18分钟，为39毫克/100毫升（3.5毫当量/升）。在涉及大肌肉群的最大强度肌肉运动后，血乳酸浓度超过100毫克/100毫升是常见现象。长时间最大强度运动后血乳酸值较低，表明存在一种不同类型的疲劳，其原因目前尚不清楚。文中还给出了在实际比赛速度下滑雪时的摄氧量数据（平均每分钟摄氧量 = 4.45升）。
