Dietary, serum and urine ascorbic acid status in male athletes.

The ascorbic acid (AA)-status of 14 marathon runners, 12 soccer players, 9 wrestlers, 9 basketball players and 16 controls was determined. A 7-day food weighed record was kept to quantify the AA-intake. In addition, the AA-serum concentrations and urinary ascorbate excretion were measured.

alpha-Tocopherol supplementation in racing cyclists during extreme endurance training.

This study was undertaken to evaluate the effects of 5 months of alpha-tocopherol supplementation on physical performance during aerobic exercise training in 30 top-class cyclists. Antioxidative effects of supplementation were also studied. Plasma alpha-tocopherol concentration increased significantly in the vitamin E-supplemented group, whereas the placebo group showed a trend toward decrease.

Acute changes in vitamin B6 status in endurance athletes before and after a marathon.

The vitamin B6 status of 13 endurance athletes was determined by whole blood B6 (microbiological) and urine 4-pyridoxic acid (4-PA) (HPLC), serum vitamin B6 (pyridoxal, pyridoxol, pyridoxamine) (HPLC), and erythrocyte alpha-EGOT measurements with the aid of 7-day records. In addition, blood and serum samples and urine were collected before (Time A), directly after (Time B), and 2 hr after a marathon race (Time C). The total energy intake was 12,303 +/- 3,464 kJ/day (34% fat, 48% carbohydrates, 14% protein).

Lipid peroxidation and antioxidative vitamins under extreme endurance stress.

The aim of this study was to examine whether extreme endurance stress of trained athletes can influence lipid peroxidation and muscle enzymes. A randomized and placebo-controlled study was carried out on 24 trained long-distance runners who were substituted with alpha-tocopherol (400 I.U.

Assessment of vitamin B6 status of strength and speedpower athletes.

Objective: The investigation was designed to obtain information concerning the vitamin B6 status in high-performance athletes.

Subjects: Fifty-seven strength and speedpower athletes were available for examination.

Methods: Vitamin B6 status was determined by a 7-day weighed food record, enzyme activity (alpha-EGOT) measurement, whole blood concentrations (Saccharomyces carlsbergenisis and 4-pyridoxinic acid (4-PA) excretion (high-pressure liquid chromatography).