Presentation Type

Poster

Full Name of Faculty Mentor

Justin Guilkey, Kinesiology

Other Mentors

Jakob Lauver and Timothy Rotarius, Kinesiology

Major

Exercise and Sport Science

Presentation Abstract

Muscle oxidative capacity (MOC) is the maximum rate at which the muscle can utilize oxygen to meet the energy demand of exercise. Near-infrared spectroscopy (NIRS) measurement of muscle oxygen uptake (mVO2) during brief arterial occlusions has shown to be a valid, reliable indicator of MOC, but is affected by aerobic fitness. It is unclear if the NIRS measurement can detect a difference in MOC in populations of varying aerobic fitness. The purpose is to compare MOC between collegiate cross-country runners and age-matched college students. Maximal oxygen uptake will be measured from an individualized treadmill test to characterize aerobic fitness. MOC will be determined from a series of 20 short (5-10 sec) arterial occlusions interspersed with short recoveries. Rapid inflation cuffs placed on the distal portion of the thigh will be inflated to 300 mmHg during occlusions and released during recovery. Deoxyhemoglobin (HHb), collected at 10 Hz, will be measured at the gastrocnemius. To calibrate the signal to individuals, a 5-min arterial occlusion will determine maximal deoxygenation (highest HHb) and the hyperemic response after cuff release will determine minimum HHB (maximal oxygenation). The slope of change in HHb during the first 3-5 seconds of each occlusion will be the mVO2. Each mVO2 will be plotted and a mono-exponential decay curve will be fitted to determine the time constant; time constant is indicative of MOC. A t-test will compare MOC between groups. It is hypothesized that collegiate cross-country runners will exhibit a faster time constant which would indicate greater MOC.

Location

Poster Session 2

Start Date

13-4-2022 4:30 PM

End Date

13-4-2022 6:30 PM

Disciplines

Exercise Science

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Apr 13th, 4:30 PM Apr 13th, 6:30 PM

Association of Near-Infrared Spectroscopy Assessed Muscle Oxidative Capacity Between Collegiate Cross-Country Athletes and College Students

Poster Session 2

Muscle oxidative capacity (MOC) is the maximum rate at which the muscle can utilize oxygen to meet the energy demand of exercise. Near-infrared spectroscopy (NIRS) measurement of muscle oxygen uptake (mVO2) during brief arterial occlusions has shown to be a valid, reliable indicator of MOC, but is affected by aerobic fitness. It is unclear if the NIRS measurement can detect a difference in MOC in populations of varying aerobic fitness. The purpose is to compare MOC between collegiate cross-country runners and age-matched college students. Maximal oxygen uptake will be measured from an individualized treadmill test to characterize aerobic fitness. MOC will be determined from a series of 20 short (5-10 sec) arterial occlusions interspersed with short recoveries. Rapid inflation cuffs placed on the distal portion of the thigh will be inflated to 300 mmHg during occlusions and released during recovery. Deoxyhemoglobin (HHb), collected at 10 Hz, will be measured at the gastrocnemius. To calibrate the signal to individuals, a 5-min arterial occlusion will determine maximal deoxygenation (highest HHb) and the hyperemic response after cuff release will determine minimum HHB (maximal oxygenation). The slope of change in HHb during the first 3-5 seconds of each occlusion will be the mVO2. Each mVO2 will be plotted and a mono-exponential decay curve will be fitted to determine the time constant; time constant is indicative of MOC. A t-test will compare MOC between groups. It is hypothesized that collegiate cross-country runners will exhibit a faster time constant which would indicate greater MOC.

 

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