the onset and magnitude of cardiovascular drift depend on exercise intensity in runners
DESCRIPTION
The theoretical rationale and results of two studies I performed examining cardiovascular drift in different populations of runners.TRANSCRIPT
![Page 1: The Onset And Magnitude Of Cardiovascular Drift Depend On Exercise Intensity In Runners](https://reader035.vdocument.in/reader035/viewer/2022062312/556c74b4d8b42ad85e8b5458/html5/thumbnails/1.jpg)
Slide 1
The Onset and Magnitude of Cardiovascular Drift Depend on
Exercise Intensity in Runnersby Jena Winger
A SENIOR PROJECT Presented to the Department of Exercise Science
and the College of Liberal Artsin partial fulfillment of the requirements
for the degree of Bachelor of Arts
March 17, 2009
![Page 2: The Onset And Magnitude Of Cardiovascular Drift Depend On Exercise Intensity In Runners](https://reader035.vdocument.in/reader035/viewer/2022062312/556c74b4d8b42ad85e8b5458/html5/thumbnails/2.jpg)
Slide 2
130
140
150
160
170
180
190
5 10 15 20 25 30 35 40 45 50 55 60Time (min)
Hea
rt R
ate
(bpm
)
Cardiovascular Drift
∆=10BPM
![Page 3: The Onset And Magnitude Of Cardiovascular Drift Depend On Exercise Intensity In Runners](https://reader035.vdocument.in/reader035/viewer/2022062312/556c74b4d8b42ad85e8b5458/html5/thumbnails/3.jpg)
Slide 3
Causes of CVdrift
Cardiovascular drift
↑ Core Temp Sympathetic Stimulation
↓ Muscle Contractility
↓ Force of Contraction
Thermoregulation
↑ Cutaneous Blood FlowSweating
Dehydration
↓ Plasma Volume
↓ Total Blood Volume
↓ End-Diastolic Volume
↓ Stroke Volume
↑ Heart Rate
↓ Central Blood Volume
↓ Ventricular filling time
![Page 4: The Onset And Magnitude Of Cardiovascular Drift Depend On Exercise Intensity In Runners](https://reader035.vdocument.in/reader035/viewer/2022062312/556c74b4d8b42ad85e8b5458/html5/thumbnails/4.jpg)
Slide 4
Is there an energy cost associated with cardiovascular drift and if so, can it be
quantified?
![Page 5: The Onset And Magnitude Of Cardiovascular Drift Depend On Exercise Intensity In Runners](https://reader035.vdocument.in/reader035/viewer/2022062312/556c74b4d8b42ad85e8b5458/html5/thumbnails/5.jpg)
Slide 5
What has been done?
• Lajoie, C., Laurencelle, L., Trudeau, F. (2000)• Observed drift in all but blood lactate• Lactate threshold fixed @ 4mmol/L
![Page 6: The Onset And Magnitude Of Cardiovascular Drift Depend On Exercise Intensity In Runners](https://reader035.vdocument.in/reader035/viewer/2022062312/556c74b4d8b42ad85e8b5458/html5/thumbnails/6.jpg)
Slide 6
![Page 7: The Onset And Magnitude Of Cardiovascular Drift Depend On Exercise Intensity In Runners](https://reader035.vdocument.in/reader035/viewer/2022062312/556c74b4d8b42ad85e8b5458/html5/thumbnails/7.jpg)
Slide 7
Purpose
Determine the energy cost associated with CVdrift in runners by examining HR, VO2, and
BL at three different exercise intensities: at, just above, and just below MLSS.
![Page 8: The Onset And Magnitude Of Cardiovascular Drift Depend On Exercise Intensity In Runners](https://reader035.vdocument.in/reader035/viewer/2022062312/556c74b4d8b42ad85e8b5458/html5/thumbnails/8.jpg)
Slide 8
Hypothesis
Minor differences in exercise intensity would result in a significantly different onset and
magnitude of both CVdrift and VO2drift
![Page 9: The Onset And Magnitude Of Cardiovascular Drift Depend On Exercise Intensity In Runners](https://reader035.vdocument.in/reader035/viewer/2022062312/556c74b4d8b42ad85e8b5458/html5/thumbnails/9.jpg)
Slide 9
Method
• Participants• VO2max test
• Lactate Threshold test• 3 Steady State exercise tests• Statistical Analysis
![Page 10: The Onset And Magnitude Of Cardiovascular Drift Depend On Exercise Intensity In Runners](https://reader035.vdocument.in/reader035/viewer/2022062312/556c74b4d8b42ad85e8b5458/html5/thumbnails/10.jpg)
Slide 10
Participants
N= 10
Age 40.30 ± 8.27
Years Training 9.25 ± 6.97
Height (m) 1.76 ± 0.07
Weight (kg) 71.29 ± 10.76
VO2max (ml/kg/min) 55.96 ± 5.48
Hrmax (bpm) 181.9 ± 12.20
BL @ MLSS (mM/L) 2.29 ±-.95
95% MLSS (MPH) 8.44 ± 0.61
100% MLSS (MPH) 8.89 ± 0.66
105% MLSS (MPH) 9.35 ± 0.70
N= 5
Age 19.6 ± 1.14
Years Training 6.4 ± 1.14
Height (m) 1.79 ± 0.05
Weight (kg) 66.30 ± 4.44
VO2max (ml/kg/min) 67.35 ± 2.69
Hrmax (bpm) 193.20 ± 5.76
BL @ MLSS (mM/L) 1.94 ± 0.59
MLSS – 0.02 (MPH) 9.52 ± 0.61
MLSS (MPH) 9.72 ± 0.61
MLSS + 0.02 (MPH) 9.92 ± 0.61
SCRP ResearchCommunity Recreational Runners
Thesis ResearchMen’s Cross Country Team
![Page 11: The Onset And Magnitude Of Cardiovascular Drift Depend On Exercise Intensity In Runners](https://reader035.vdocument.in/reader035/viewer/2022062312/556c74b4d8b42ad85e8b5458/html5/thumbnails/11.jpg)
Slide 11
– Criteria for valid VO2max test: • HR & VO2 plateau RER> 1.1 and volitional exhaustion
– Self-selected warm up speed– Two minute stages– 1.0-2.0 MPH speed increases to exhaustion– Continuous HR and VO2 collection
– Blood collection @ end of each stage for lactate analysis
VO2max test
![Page 12: The Onset And Magnitude Of Cardiovascular Drift Depend On Exercise Intensity In Runners](https://reader035.vdocument.in/reader035/viewer/2022062312/556c74b4d8b42ad85e8b5458/html5/thumbnails/12.jpg)
Slide 12
![Page 13: The Onset And Magnitude Of Cardiovascular Drift Depend On Exercise Intensity In Runners](https://reader035.vdocument.in/reader035/viewer/2022062312/556c74b4d8b42ad85e8b5458/html5/thumbnails/13.jpg)
Slide 13
– Same warm up pace– Five minute stages– 0.2 to 0.3 MPH (0.09 to 0.13 m/s) speed increases
until threshold is reached– Continuous HR and VO2 collection
– Blood collection @ end of each stage for lactate analysis
Lactate Threshold Test
![Page 14: The Onset And Magnitude Of Cardiovascular Drift Depend On Exercise Intensity In Runners](https://reader035.vdocument.in/reader035/viewer/2022062312/556c74b4d8b42ad85e8b5458/html5/thumbnails/14.jpg)
Slide 14
![Page 15: The Onset And Magnitude Of Cardiovascular Drift Depend On Exercise Intensity In Runners](https://reader035.vdocument.in/reader035/viewer/2022062312/556c74b4d8b42ad85e8b5458/html5/thumbnails/15.jpg)
Slide 15
– 45 minutes at, just above, and just below Lactate Threshold
– Continuous HR and VO2 collection
– Blood collection for lactate analysis every 10 minutes
Statistical Analysis– ANOVA (α=.05)
Prolonged steady-state exercise bouts
![Page 16: The Onset And Magnitude Of Cardiovascular Drift Depend On Exercise Intensity In Runners](https://reader035.vdocument.in/reader035/viewer/2022062312/556c74b4d8b42ad85e8b5458/html5/thumbnails/16.jpg)
Slide 16
Heart Rate
*P = 3.21E-06
![Page 17: The Onset And Magnitude Of Cardiovascular Drift Depend On Exercise Intensity In Runners](https://reader035.vdocument.in/reader035/viewer/2022062312/556c74b4d8b42ad85e8b5458/html5/thumbnails/17.jpg)
Slide 17
Heart Rate
*P = 0.205777
![Page 18: The Onset And Magnitude Of Cardiovascular Drift Depend On Exercise Intensity In Runners](https://reader035.vdocument.in/reader035/viewer/2022062312/556c74b4d8b42ad85e8b5458/html5/thumbnails/18.jpg)
Slide 18*P = 8.42E-13
Oxygen Consumption
![Page 19: The Onset And Magnitude Of Cardiovascular Drift Depend On Exercise Intensity In Runners](https://reader035.vdocument.in/reader035/viewer/2022062312/556c74b4d8b42ad85e8b5458/html5/thumbnails/19.jpg)
Slide 19
Oxygen Consumption
*P = 84.22E-08
![Page 20: The Onset And Magnitude Of Cardiovascular Drift Depend On Exercise Intensity In Runners](https://reader035.vdocument.in/reader035/viewer/2022062312/556c74b4d8b42ad85e8b5458/html5/thumbnails/20.jpg)
Slide 20*P = 0.000124
Blood Lactate
![Page 21: The Onset And Magnitude Of Cardiovascular Drift Depend On Exercise Intensity In Runners](https://reader035.vdocument.in/reader035/viewer/2022062312/556c74b4d8b42ad85e8b5458/html5/thumbnails/21.jpg)
Slide 21
Blood Lactate
*P = 0.013788
![Page 22: The Onset And Magnitude Of Cardiovascular Drift Depend On Exercise Intensity In Runners](https://reader035.vdocument.in/reader035/viewer/2022062312/556c74b4d8b42ad85e8b5458/html5/thumbnails/22.jpg)
Slide 22
Findings
SCRP Research• Significant differences in heart rate, oxygen
consumption, and blood lactate between and within each intensity (p<0.05)
Thesis Research• No significant differences in heart rate• Significant differences in oxygen consumption and
blood lactate (p<0.05)
![Page 23: The Onset And Magnitude Of Cardiovascular Drift Depend On Exercise Intensity In Runners](https://reader035.vdocument.in/reader035/viewer/2022062312/556c74b4d8b42ad85e8b5458/html5/thumbnails/23.jpg)
Slide 23
Issues with data collection
• Variability between and within participants
• Scheduling• Retention
![Page 24: The Onset And Magnitude Of Cardiovascular Drift Depend On Exercise Intensity In Runners](https://reader035.vdocument.in/reader035/viewer/2022062312/556c74b4d8b42ad85e8b5458/html5/thumbnails/24.jpg)
Slide 24
Conclusion
The onset and magnitude of CVdrift is affected by changes in intensity ≤ 0.22 m/s, but is
not affected by changes in exercise intensity ≤0.09 m/s
![Page 25: The Onset And Magnitude Of Cardiovascular Drift Depend On Exercise Intensity In Runners](https://reader035.vdocument.in/reader035/viewer/2022062312/556c74b4d8b42ad85e8b5458/html5/thumbnails/25.jpg)
Slide 25
Future Studies
• Second VO2max test
• Collect RPE and Core Body Temperature data• Larger sample size• Improved compliance
![Page 26: The Onset And Magnitude Of Cardiovascular Drift Depend On Exercise Intensity In Runners](https://reader035.vdocument.in/reader035/viewer/2022062312/556c74b4d8b42ad85e8b5458/html5/thumbnails/26.jpg)
Slide 26
Acknowledgements
• National Science Foundation (CCLI 0511219)• Mary Stuart Rogers Foundation• Gallagher’s Running Team• WU Men’s Cross Country Team• Kristi Murphy, Kelsey Nakata, and Doug Rice• Stasinos Stavrianeas
![Page 27: The Onset And Magnitude Of Cardiovascular Drift Depend On Exercise Intensity In Runners](https://reader035.vdocument.in/reader035/viewer/2022062312/556c74b4d8b42ad85e8b5458/html5/thumbnails/27.jpg)
Slide 27
Questions?