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Table 3 Independent variables of acid–base balance 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 SID (mEq/l) Atot (mEq/l) pCO2 (mmHg)
  ND LPVD ND LPVD ND LPVD
PREdiet 38.6 ± 1.8 38.6 ± 1.8 18.5 ± 0.8 18.3 ± 0.6 6.07 ± 1.29 6.13 ± 1.09
POSTdiet 39.4 ± 1.2 39.8 ± 0.9# 18.1 ± 1.0 18.1 ± 1.0 6.05 ± 0.82 5.98 ± 0.64
PREtest 38.8 ± 1.5 38.5 ± 1.2* 18.1 ± 0.8 18.1 ± 1.0 5.98 ± 0.95 6.05 ± 0.89
Stage1 38.0 ± 1.1 37.9 ± 0.6** 18.8 ± 0.9 18.9 ± 0.5 5.60 ± 0.38 5.72 ± 0.97
Stage2 35.7 ± 1.0* 35.3 ± 1.7** 19.3 ± 0.8** 19.1 ± 0.8** 5.30 ± 0.28 5.27 ± 0.57
Stage3 30.6 ± 1.6** 29.5 ± 2.2*** 20.2 ± 1.0*** 20.1 ± 1.0** 4.61 ± 0.38* 4.55 ± 0.41**
Stage4 29.6 ± 3.5** 29.1 ± 2.8*** 20.4 ± 1.5** 20.2 ± 1.0*** 4.23 ± 0.66* 4.51 ± 0.56**
  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 ergometre 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. PREdiet compared to POSTdiet #= p<0.05.
  8. POSTdiet vs. Stage1–4 *= p<0.05; **= p<0.01; ***= p<0.001.
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