Key result
Six weeks of inspiratory muscle training significantly reduced locomotor muscle deoxygenation by 1.7 µM and respiratory muscle deoxygenation by 2.8 µM during exercise with heavy inspiratory loading in highly-trained male cyclists.
Why the study?
Does inspiratory muscle training reduce respiratory and limb locomotor muscle deoxygenation during exercise with resistive inspiratory loading in highly trained cyclists?
RCT (n=16)
Double-blind
Randomly assigned
No
Does inspiratory muscle training reduce respiratory and limb locomotor muscle deoxygenation during exercise with resistive inspiratory loading in highly trained cyclists?
Mean Difference: 1.7
p-value: p=0.02
Inspiratory muscle training reduces oxygen extraction by active respiratory and limb muscles during heavy inspiratory loading in highly-trained cyclists, suggesting improved oxygen delivery.
Supports IMT to limit muscle deoxygenation under heavy load in trained cyclists; extends RCT evidence on respiratory training physiology.
We investigated how inspiratory muscle training impacted respiratory and locomotor muscle deoxygenation during submaximal exercise with resistive inspiratory loading. 16 male cyclists completed 6 weeks of either true (n=8) or sham (n=8) inspiratory muscle training. Pre- and post-training, subjects completed 3, 6-min experimental trials performed at ~80% ˙VO2peak with interventions of either moderate inspiratory loading, heavy inspiratory loading, or maximal exercise imposed in the final 3 min. Locomotor and respiratory muscle oxy-, deoxy-, and total-haemoglobin and myoglobin concentration was continuously monitored using near-infrared spectroscopy. Locomotor muscle deoxygenation changes from 80% ˙VO2peak to heavy inspiratory loading were significantly reduced pre- to post-training from 4.3±5.6 µM to 2.7±4.7 µM. Respiratory muscle deoxygenation was also significantly reduced during the heavy inspiratory loading trial (4.6±3.5 µM to 1.9±1.5 µM) post-training. There was no significant difference in oxy-, deoxy-, or total-haemoglobin and myoglobin during any of the other loading trials, from pre- to post-training, in either group. After inspiratory muscle training, highly-trained cyclists exhibited decreased locomotor and respiratory muscle deoxygenation during exercise with heavy inspiratory loading. These data suggest that inspiratory muscle training reduces oxygen extraction by the active respiratory and limb muscles, which may reflect changes in respiratory and locomotor muscle oxygen delivery.
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Turner et al. (2016) conducted an RCT in Healthy, highly trained cyclists (n=16). Inspiratory muscle training vs. Sham training (60 breaths, once daily at 15% PImax) was evaluated on Locomotor muscle deoxygenation change from 80% VO2peak to heavy inspiratory loading (1.7 µM reduction, p=0.02). Six weeks of inspiratory muscle training significantly reduced locomotor muscle deoxygenation by 1.7 µM and respiratory muscle deoxygenation by 2.8 µM during exercise with heavy inspiratory loading in highly-trained male cyclists.
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