Key result
Six weeks of inspiratory muscle training at either 15% or 85% of maximal inspiratory pressure significantly increased mean anaerobic power and maximal inspiratory pressure in trained cyclists.
Why the study?
It was unknown whether inspiratory muscle training affects anaerobic power during the final sprint phase of a time trial in trained cyclists.
Does inspiratory muscle training improve anaerobic power during the final sprint phase of a time trial in trained cyclists?
RCT (n=23)
Randomly assigned
Does inspiratory muscle training improve anaerobic power during the final sprint phase of a time trial in trained cyclists?
Absolute Event Rate: 632% vs 574.4%
Six weeks of inspiratory muscle training at either 15% or 85% of maximal inspiratory pressure improves maximal inspiratory pressure and mean anaerobic power in trained cyclists.
The current study was conducted to determine if inspiratory muscle training (IMT) has an effect on anaerobic power during the final sprint phase of a time trial in trained cyclists. Twenty three trained cyclists were included in the data and were randomly assigned to one of two groups, a training or placebo group. Each group performed IMT, but the training group performed at 85% of their maximal inspiratory pressure (MIP) while the placebo group trained at 15%. MIP was measured pre and post training. One 15 km time trial was performed pre and post IMT. Heart rate (HR), ratings of perceived exertion (RPE), and arterial oxygen-hemoglobin saturation (SaO2) were recorded every five minutes during the time trial. Immediately following the 15 km time trial each subject performed a 30 second Wingate Anaerobic Test to measure anaerobic power. A two way ANOVA with one repeated factor was applied to test for differences across the tests and between the two groups. The results showed no significant increase in peak anaerobic power in either group. There was, however, a significant main effect for time in mean anaerobic power in both groups (placebo group increased 529.6 ±124.6 watts to 574.4 ± 99.3 and 612.3 ±81.7 watts to 632 ± 81.7 watts in the training group). There was a significant main effect for time when measuring the average SaO2 values in both the placebo and training group from 94.8 ±2.1 % to 95.3 ±1.8 % and 93.8 ± 1.9 % to 95.1 ± 1.6 %, respectively. MIP showed a significant main effect for time in both the placebo and training group from 110 ±40 cmH2O to 150 ±40 cmH2O and 130 ±30 cmH2O to 160 ± 20 cmH2O, respectively. There was no significant main effect over time for RPE, HR, or time trial time in either group. Six weeks of IMT, whether at 15% or 85% of MIP, can improve MIP, and mean anaerobic power during the final sprint phase of a time trial.
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Courtenay McFadden (2020) conducted an RCT in Trained cyclists (n=23). Inspiratory muscle training vs. Placebo training at 15% of MIP was evaluated on Mean anaerobic power. Six weeks of inspiratory muscle training at either 15% or 85% of maximal inspiratory pressure significantly increased mean anaerobic power and maximal inspiratory pressure in trained cyclists.
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