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Table 2 Antioxidant status measured in the peripheral blood of females ingesting ascorbic acid or placebo before exercise

From: Effects of ascorbic acid supplementation on oxidative stress markers in healthy women following a single bout of exercise

Test Placebo Ascorbic Acid (1000 mg)
Pre-exercise Post-exercise 30 min post-exercise Pre-exercise Post-exercise 30 min post-exercise
TAS, mM Trolox equivalent 1.27 ± 0.04 1.29 ± 0.02 1.33 ± 0.02 1.28 ± 0.03 1.27 ± 0.02 1.31 ± 0.03
FRAP, μM FeSO4 equivalent 74.0 ± 3.29 77.0 ± 3.54 78.1 ± 3.59 73.5 ± 3.25 77.2 ± 3.15 81.2 ± 3.35 a, p = 0.002
Plasma TBARS, μmol/g protein 0.042 ± 0.003 0.038 ± 0.003 0.044 ± 0.007 0.039 ± 0.004 0.031 ± 0.002 a, 0.048, b, p = 0.046 0.030 ± 0.002 a, p = 0.034, b, p = 0.044
Glutathione peroxidase (GPx), U/g Hb 133 ± 7.1 135 ± 7.6 128 ± 6.8 133 ± 5.3 130 ± 6.4 138 ± 7.3
Superoxide dismutase, U/g Hb 2609 ± 263 3168 ± 461 3450 ± 454a, p = 0.022 2605 ± 375 2726 ± 340 2794 ± 364
Catalase, U/g Hb 90 ± 11.1 90 ± 12.4 90 ± 16.2 94 ± 11.8 91 ± 16.0 92 ± 12.0
  1. The exercise bout was performed indoors on a stationary bicycle for 30 min at intensity corresponding to 65–75% of maximum heart rate. Values are means ± SE; n = 19 per cohort. The p-values indicate the results of a Bonferroni post-hoc analysis. acompared with pre-exercise value (within group); bcompared with the same time point (in between group). TAS, total antioxidant status; FRAP, ferric reducing ability of plasma; TBARS thiobarbituric acid reactive substances; U/g Hb, unit per gram of hemoglobin