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Table 2 Plasma pH and [HCO 3 - ] at rest and during cycle ergometer tests

From: Low-protein vegetarian diet does not have a short-term effect on blood acid–base status but raises oxygen consumption during submaximal cycling

Sample pH HCO3- (mmol/l)
  ND LPVD ND LPVD
PREdiet 7.467 ± 0.039 7.448 ± 0.028 33.6 ± 8.7 32.2 ± 6.0
POSTdiet 7.455 ± 0.028 7.454 ± 0.025 32.0 ± 5.5 31.9 ± 3.9
PREtest 7.466 ± 0.030 7.459 ± 0.015 32.9 ± 6.3 32.6 ± 4.5
Stage1 7.470 ± 0.029 7.473 ± 0.036 31.0 ± 3.1 31.7 ± 4.2
Stage2 7.459 ± 0.028 7.457 ± 0.031 28.6 ± 2.3 20.8 ± 3.3
Stage3 7.378 ± 0.039* 7.368 ± 0.029** 20.8 ± 3.3** 19.9 ± 2.2***
Stage4 7.326 ± 0.076* 7.336 ± 0.03*** 16.7 ± 2.5** 18.4 ± 2.4***
  1. ND= normal diet.
  2. LPVD= low-protein vegetarian diet.
  3. PREdiet= a fasting blood sample taken in the morning before the start of ND or LPVD (day 1).
  4. POSTdiet= a fasting blood sample taken in the morning after a 4-day ND or LPVD (day 5).
  5. PREtest= a resting blood sample taken 30 min after a breakfast, before the cycle ergometer test (day 5).
  6. Stage1–4= blood samples taken after 10-min cycling at 40, 60 and 80% of VO2max and after the maximal stage (at 100% of VO2max until exhaustion).
  7. POSTdiet vs. Stage1–4 *= p<0.05; **= p<0.01; ***= p<0.001.
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