Effects of Chronic Inspiratory Muscle Strength Training on Metabolic and Cardiovascular Measures During a Glucose Tolerance Test
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Authors
Harbin, Christina
Janssen, Noah
Issue Date
2024-04-04
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Abstract
Previous work has shown that both a single session of aerobic exercise and chronic exercise training improves glucose homeostasis. Similarly, a single bout of inspiratory muscle strength training (IMST) has been shown to facilitate a greater degree of glycemic control. However, less is known about the chronic effects of IMST, particularly with respect to metabolic and cardiovascular responses to an oral glucose tolerance test (OGTT). We hypothesized that six weeks of IMST would promote a greater degree of glycemic control, via a reduction in fasting and peak glucose during an OGTT. To test this hypothesis, participants (n=19, 63% female,
average age=21.53) completed six weeks of daily training at either 15% (n=10) or 75% (n=9) of their maximal inspiratory pressure. Each subject underwent a pre-IMST glucose tolerance test in which their blood glucose level, blood pressure, and heart rate were measured at baseline, 15, 30, 45, 60, and 90 minutes following glucose ingestion. A post- IMST glucose tolerance test was completed after six weeks of training. After initial analysis, the results indicate no training effect on baseline glucose, peak glucose, 90- minutes post-glucose, or glucose area under the curve responses, for both training intensities (P>0.05). While mean arterial pressure was not affected during the OGTT (P>0.05), baseline mean arterial pressure decreased only in the 75% intensity group from the initial to post-training OGTT (P=0.0323). In summary, six weeks of high-intensity IMST decreases baseline blood pressure while glucose tolerance was unaffected in both training groups. Further data analysis will be completed to yield more in-depth results about the effects of IMST on glucose tolerance, heart rate, blood pressure, and certain respiratory measures.