Effects of a 4-week training with voluntary hypoventilation carried out at low pulmonary volumes

Spennende studie som viser hvordan lav pustefrekvens i selve trening påvirker restitusjonen etterpå. F.eks. hvordan bikarbonat/natron (HCO3-) påvirker melkesyreterskel. Teknikken bestod i å holde pusten 4 sekunder etter utpust, i bolker a 5minutter i løpet av treningsperioden. Det gir spesielt lite oksygen i blodet, som gir mange positive resultater.

http://www.sciencedirect.com/science/article/pii/S1569904807002327

Helle studien her:  http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&ved=0CCsQFjAA&url=http%3A%2F%2Fwww.researchgate.net%2Fpublication%2F5689789_Effects_of_a_4-week_training_with_voluntary_hypoventilation_carried_out_at_low_pulmonary_volumes%2Ffile%2F79e41509ccd387b0f9.pdf&ei=pM58UpS3IIKF4ATU24D4CA&usg=AFQjCNFVh6Yl8e_ScphKf6HTFiLp1CWKsw&sig2=B9Zq9u_LuDDzGru14OKsLQ&bvm=bv.56146854,d.bGE

This study investigated the effects of training with voluntary hypoventilation (VH) at low pulmonary volumes. Two groups of moderately trained runners, one using hypoventilation (HYPO, n = 7) and one control group (CONT, n = 8), were constituted. The training consisted in performing 12 sessions of 55 min within 4 weeks. In each session, HYPO ran 24 min at 70% of maximal O2 consumption (View the MathML source) with a breath holding at functional residual capacity whereas CONT breathed normally. A View the MathML source and a time to exhaustion test (TE) were performed before (PRE) and after (POST) the training period. There was no change in View the MathML source, lactate threshold or TE in both groups at POST vs. PRE. At maximal exercise, blood lactate concentration was lower in CONT after the training period and remained unchanged in HYPO. At 90% of maximal heart rate, in HYPO only, both pH (7.36 ± 0.04 vs. 7.33 ± 0.06; p < 0.05) and bicarbonate concentration (20.4 ± 2.9 mmol L−1 vs. 19.4 ± 3.5; p < 0.05) were higher at POST vs. PRE. The results of this study demonstrate that VH training did not improve endurance performance but could modify the glycolytic metabolism. The reduced exercise-induced blood acidosis in HYPO could be due to an improvement in muscle buffer capacity. This phenomenon may have a significant positive impact on anaerobic performance.

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