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Enhanced pulmonary and active skeletal muscle gas exchange during intense exercise after sprint training in men
Author(s) -
McKenna Michael J.,
Heigenhauser George J. F.,
McKelvie Robert S.,
Obminski George,
MacDougall J. Duncan,
Jones Norman L.
Publication year - 1997
Publication title -
the journal of physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.802
H-Index - 240
eISSN - 1469-7793
pISSN - 0022-3751
DOI - 10.1111/j.1469-7793.1997.703bm.x
Subject(s) - sprint , medicine , vo2 max , respiratory exchange ratio , cardiology , ventilation (architecture) , anaerobic exercise , ventilatory threshold , physical therapy , heart rate , blood pressure , mechanical engineering , engineering
1 This study investigated the effects of 7 weeks of sprint training on gas exchange across the lungs and active skeletal muscle during and following maximal cycling exercise in eight healthy males. 2 Pulmonary oxygen uptake (V̇O 2 ) and carbon dioxide output (V̇CO 2 ) were measured before and after training during incremental exercise ( n = 8 ) and during and in recovery from a maximal 30 s sprint exercise bout by breath‐by‐breath analysis ( n = 6 ). To determine gas exchange by the exercising leg muscles, brachial arterial and femoral venous blood O 2 and CO 2 contents and lactate concentration were measured at rest, during the final 10 s of exercise and during 10 min of recovery. 3 Training increased ( P < 0.05 ) the maximal incremental exercise values of ventilation (V̇ E , by 15.7 ± 7.1%), V̇CO 2 (by 9.3 ± 2.1%) and V̇O 2 (by 15.0 ± 4.2%). Sprint exercise peak power (3.9 ± 1.0% increase) and cumulative 30 s work (11.7 ± 2.8% increase) were increased and fatigue index was reduced (by −9.2 ± 1.5%) after training ( P < 0.05 ). The highest V̇ E , V̇CO 2 and V̇O 2 values attained during sprint exercise were not significantly changed after training, but a significant ( P < 0.05 ) training effect indicated increased V̇ E (by 19.2 ± 7.9%), V̇CO 2 (by 9.3 ± 2.1%) and V̇O 2 (by 12.7 ± 6.5%), primarily reflecting elevated post‐exercise values after training. 4 Arterial O 2 and CO 2 contents were lower after training, by respective mean differences of 3.4 and 21.9 ml l −1 ( P < 0.05 ), whereas the arteriovenous O 2 and CO 2 content differences and the respiratory exchange ratio across the leg were unchanged by training. 5 Arterial whole blood lactate concentration and the net lactate release by exercising muscle were unchanged by training. 6 The greater peak pulmonary V̇O 2 and V̇CO 2 with sprint exercise, the increased maximal incremental values, unchanged arterial blood lactate concentration and greater sprint performance all point strongly towards enhanced gas exchange across the lungs and in active muscles after sprint training. Enhanced aerobic metabolism after sprint training may contribute to reduced fatigability during maximal exercise, whilst greater pulmonary CO 2 output may improve acid‐base control after training.