Potteiger et al. (A-47) wished to determine if sodium citrate ingestion would improve cycling performance and facilitate favorable metabolic conditions during the cycling ride. Subjects were eight trained male competitive cyclists whose mean age was 25.4 years with a standard deviation of 6.5. Each participant completed a 30-km cycling time trial under two conditions, following ingestion of sodium citrate and following ingestion of a placebo. Blood samples were collected prior to treatment ingestion (PRE-ING); prior to exercising (PRE-EX); during the cycling ride at completion of 10, 20, and 30 km; and 15 minutes after cessation of exercise (POST-EX). The following are the values of partial pressures of oxygen (PO2) and carbon dioxide (PCO2) for each subject, under each condition, at each measurement time:

(PO2) (mm Hg)

Measurement Times Subject Treatmenta PRE-ING PRE-EX 10-km 20-km 30-km 15-POST-EX 1 1 42.00 20.00 53.00 51.00 56.00 41.00 1 2 43.00 29.00 58.00 49.00 55.00 56.00 2 1 44.00 38.00 66.00 66.00 76.00 58.00 2 2 40.00 26.00 57.00 47.00 46.00 45.00 3 1 37.00 22.00 59.00 58.00 56.00 52.00 3 2 36.00 30.00 52.00 65.00 65.00 36.00 4 1 34.00 21.00 65.00 62.00 62.00 59.00 4 2 46.00 36.00 65.00 72.00 72.00 66.00 5 1 36.00 24.00 41.00 43.00 50.00 46.00 5 2 41.00 25.00 52.00 60.00 67.00 54.00 6 1 28.00 31.00 52.00 60.00 53.00 46.00 6 2 34.00 21.00 57.00 58.00 57.00 41.00 7 1 39.00 28.00 72.00 69.00 65.00 72.00 7 2 40.00 27.00 64.00 61.00 57.00 60.00 8 1 49.00 27.00 67.00 61.00 51.00 49.00 8 2 27.00 22.00 56.00 64.00 49.00 34.00 (PCO2) (mm Hg)
Measurement Times Subject Treatmenta PRE-ING PRE-EX 10-km 20-km 30-km 15-POST-EX 1 1 31.70 30.20 28.20 29.80 28.20 30.10 1 2 24.60 24.40 34.40 35.20 30.90 34.00 2 1 27.10 35.90 31.30 35.40 34.10 42.00 2 2 21.70 37.90 31.90 39.90 45.10 48.00 3 1 37.40 49.60 39.90 39.70 39.80 42.80 3 2 38.40 42.10 40.90 37.70 37.70 45.60 4 1 36.60 45.50 34.80 33.90 34.00 40.50 4 2 39.20 40.20 31.90 32.30 33.70 45.90 5 1 33.70 39.50 32.90 30.50 28.50 37.20 5 2 31.50 37.30 32.40 31.90 30.20 31.70 6 1 35.00 41.00 38.70 37.10 35.80 40.00 6 2 27.20 36.10 34.70 36.30 34.10 40.60 7 1 28.00 36.50 30.70 34.60 34.30 38.60 7 2 28.40 31.30 48.10 43.70 35.10 34.70 8 1 22.90 28.40 25.70 28.20 32.30 34.80 8 2 41.40 41.80 29.50 29.90 31.30 39.00 a 1 ¼ Sodium citrate; 2 ¼ placebo.
Source: Data provided courtesy of Dr. Jeffrey A. Potteiger.