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

Table 6 Carbohydrate and fat metabolites and albumin in blood at rest and during cycle ergometer tests

Sample	Lactate (mmol/l)		Glucose (mmol/l)		FFA (mmol/l)		TG (mmol/l)		Albumin (g/l)
Sample	ND	LPVD	ND	LPVD	ND	LPVD	ND	LPVD	ND	LPVD
PREdiet	1.6 ± 0.6	1.5 ± 0.5	4.80 ± 0.39	4.83 ± 0.27	0.34 ± 0.21	0.31 ± 0.06	1.18 ± 0.77	1.07 ± 0.30	40.3 ± 2.2	39.4 ± 3.1
POSTdiet	1.4 ± 0.5	1.4 ± 0.6	4.95 ± 0.42	4.81 ± 0.21	0.28 ± 0.17	0.35 ± 0.15	0.90 ± 0.23	0.85 ± 0.19^#	39.1 ± 3.3	41.7 ± 2.0^#
PREtest	2.6 ± 0.7	2.9 ± 1.0	5.16 ± 1.00	6.18 ± 1.28	0.15 ± 0.07	0.22 ± 0.09	0.91 ± 0.23	0.79 ± 0.23	40.3 ± 1.8	39.8 ± 2.9
Stage1	2.6 ± 0.9*	2.7 ± 0.9**	4.12 ± 0.44	3.88 ± 0.69	0.13 ± 0.04	0.13 ± 0.05	1.02 ± 0.25	0.82 ± 0.23	40.7 ± 2.4**	41.7 ± 2.8
Stage2	4.8 ± 1.2*	5.2 ± 1.9**	4.64 ± 0.63	4.38 ± 0.66	0.18 ± 0.08	0.19 ± 0.07	1.05 ± 0.22	0.89 ± 0.26	43.0 ± 2.5**	42.6 ± 1.2
Stage3	10.2 ± 1.6***	11.3 ± 2.1***	5.54 ± 0.79	5.66 ± 0.97	0.22 ± 0.10	0.22 ± 0.06	1.12 ± 0.26*	0.92 ± 0.28	44.8 ± 2.2**	44.7 ± 2.0*
Stage4	11.2 ± 3.4**	12.2 ± 2.1***	5.81 ± 0.99	5.21 ± 0.80	0.20 ± 0.10	0.20 ± 0.05	1.16 ± 0.29*	0.93 ± 0.28	44.3 ± 2.7**	44.3 ± 2.7*

ND= normal diet.
LPVD= low-protein vegetarian diet.
PREdiet= a fasting blood sample taken in the morning before the start of ND or LPVD (day 1).
POSTdiet= a fasting blood sample taken in the morning after a 4-day ND or LPVD (day 5).
PREtest= a resting blood sample taken 30 min after a breakfast, before the cycle ergometre test (day 5).
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).
PREdiet compared to POSTdiet ^#= p<0.05.
POSTdiet vs. Stage 1–4 *= p<0.05; **= p<0.01; ***= p<0.001.

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