Effects of a 4-week training with voluntary hypoventilation carried out at low pulmonary volumes.
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 O(2) consumption ( [V(02max)) with a breath holding at functional residual capacity whereas CONT breathed normally. A V(02max) and a time to exhaustion test (TE) were performed before (PRE) and after (POST) the training period. There was no change in V(O2max), 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 mmolL(-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.
Woorons
Xavier
X
Université Paris 13, Laboratoire Réponses cellulaires et fonctionnelles à l'hypoxie, EA2363, 74 rue Marcel Cachin, 93017 Bobigny Cedex, France. xwoorons@laposte.net
Mollard
Pascal
P
Pichon
Aurélien
A
Duvallet
Alain
A
Richalet
Jean-Paul
JP
Lamberto
Christine
C
D000222:Adaptation, Physiological / Q000502:physiology*; D000328:Adult; D001639:Bicarbonates / Q000097:blood; D001945:Breathing Exercises; D005652:Functional Residual Capacity / Q000502:physiology; D006801:Humans; D007040:Hypoventilation / Q000097:blood*; D019344:Lactic Acid / Q000097:blood; D008297:Male; D010101:Oxygen Consumption / Q000502:physiology*; D010807:Physical Endurance / Q000502:physiology*; D010809:Physical Fitness / Q000502:physiology*; D011214:Practice, Psychological; D012123:Pulmonary Ventilation / Q000502:physiology*; D012016:Reference Values; D012119:Respiration; D013997:Time Factors
D001639:Bicarbonates; D019344:Lactic Acid