The Relationship Between Blood Glucose and Cortisol Levels After Exercise - PowerPoint PPT Presentation

Loading...

PPT – The Relationship Between Blood Glucose and Cortisol Levels After Exercise PowerPoint presentation | free to view - id: 1bfc3b-Y2UxN



Loading


The Adobe Flash plugin is needed to view this content

Get the plugin now

View by Category
About This Presentation
Title:

The Relationship Between Blood Glucose and Cortisol Levels After Exercise

Description:

Cortisol is a sterol lipid secreted by the glucocorticoid region of ... Cortisol influcences T and B cell activity, Corticosteroid globulin and gluconeogenisis. ... – PowerPoint PPT presentation

Number of Views:724
Avg rating:3.0/5.0
Slides: 28
Provided by: Bri92
Category:

less

Write a Comment
User Comments (0)
Transcript and Presenter's Notes

Title: The Relationship Between Blood Glucose and Cortisol Levels After Exercise


1
The Relationship Between Blood Glucose and
Cortisol Levels After Exercise
  • Ramona Granat
  • 1053457
  • Biology 493

2
Introduction
  • Cortisol is a sterol lipid secreted by the
    glucocorticoid region of the adrenal cortex.
  • Stress (Emotional, physiological or social)
    activates the adrenal gland to secrete cortisol
    (Nieman 1999).
  • Cortisol influcences T and B cell activity,
    Corticosteroid globulin and gluconeogenisis.

3
  • Cortisol binds to receptors in adipose tissue to
    stimulate gluconeogenesis (Bonifazi 2001).
  • Gluconeogenesis is responsible for maintaining
    normal blood glucose levels during stress by
    breaking down glycogen and mobilizing fat from
    adipose tissue.
  • Gluconeogenesis occurs when glucose levels drop
    and blood glycogen is depleted, as a result
    noncarbohydate sources are used to produce
    glucose.

4
  • Studies have shown that exercise increases serum
    cortisol concentrations (Gleeson 2000, Kraemer
    2001, Fisher 2001).
  • Other studies have found no significant increase
    in cortisol levels after exercise (Nieman 1995).

5
  • Intensity of exercise affects results.
  • Endurance and age of participant may influence
    cortisol secretion (Davie 1999 and Izquierdo
    2001).
  • Time of day influences cortisol response (Kanaley
    2001)

6
Purpose
  • If blood glucose levels decrease following
    exercise then the cortisol levels should
    increase.
  • Purpose of this study was to determine the
    relationship between blood glucose and cortisol
    levels after exercise

7
Methods
  • Ten subjects were tested, four males and six
    females.
  • Subjects ages ranged from 19 years to 24 years in
    age.
  • Each subject was required to fast for 12 hours
    prior to exercise.
  • All tests were conducted between the hours of
    eight and eleven oclock in the morning.

8
  • Blood glucose samples were taken immediately
    before and after exercise using a Precision Q-I-D
    blood glucose monitor.
  • Cortisol samples were taken immediately before
    and after exercise by collecting saliva using
    cortisol collection tubes. Cortisol
    concentrations were measured by Salametrics
    Laboratory (College Park, PA).

9
  • Exercise bouts consisted of bicycling on a
    bicycle ergometer.
  • Subjects were required to peddle until they
    reached their target heart rate (70 of the age
    predicted heart rate).
  • Female subjects peddled for 20 minutes at their
    target heart rate
  • Male subjects peddled for 30 minutes at their
    target heart rate.

10
  • The bike was set on a incline program that
    started with a resistance of 70 watts, subjects
    were instructed to keep a constant intensity
    measured in rotations per minute.
  • Resistance increased 15 watts (one resistance
    level) every 30 seconds until a resistance level
    was reached where the subject was unable to
    maintain their target heart rate.
  • At that point the watts were reduced one
    resistance level (15 watts) were the subject
    continued to peddle for the remainder of the test
    period.
  • Data Analysis consisted of a paired t-test and a
    regression analysis. Significance was
    established at 0.05.

11
Results
  • Individual variation for pre and post glucose
    concentrations were high.

12
Table 1. The pre and post exercise blood glucose
and cortisol concentrations for each subject
tested.
13
Results
  • Individual variation for pre and post glucose
    concentrations were high.
  • There was no significant difference in the blood
    glucose levels in response to the exercise test.
  • There was a significant (plt0.05) increase in
    cortisol as a result of the exercise.

14
Table 1. The pre and post exercise blood glucose
and cortisol concentrations for each subject
tested.
15
Table 2. The paired t-test results for pre and
post exercise blood glucose and cortisol.
16
Results
  • Individual variation for pre and post glucose
    concentrations were high.
  • There was no significant difference in the blood
    glucose levels in response to the exercise test.
  • There was a significant (plt0.05) increase in
    cortisol as a result of the exercise.
  • The regression between blood glucose and cortisol
    at the end of exercise demonstrated a significant
    direct relationship (plt0.05), however, there was
    still a lot of variation (R2 0.49)

17
Figure 3. The regression between blood glucose
and cortisol after exercise for each of the
subjects tested.
18
Table 3. Analysis of the regression between blood
glucose and cortisol after exercise.
19
Discussion
  • There was no change statistically in blood
    glucose concentrations due to the exercise in
    this study
  • Failure for a decrease in blood glucose may be
    due to two factors
  • 1. Intensity
  • 2. Gluconeogenesis

20
Figure 1 The comparison of pre and post exercise
blood glucose levels of each subject tested.
21
Discussion
  • There was no change statistically in blood
    glucose concentrations due to the exercise in
    this study
  • Failure for a decrease in blood glucose may be
    due to two factors
  • 1. Intensity
  • 2. Gluconeogenesis

22
  • Intensity
  • Exercise protocol appeared to be sufficient to
    lower blood glucose in some individuals, it may
    not have been intense enough for all individuals

23
  • Gluconeogenesis
  • Onset appears quicker than it was anticipated.
  • Exercise protocol was sufficient to cause a
    cortisol response.
  • Individuals with higher cortisol concentrations
    also exhibited higher glucose concentrations as
    shown in the regression between glucose and
    cortisol after exercise. This is a positive
    direct relationship.
  • The effect of cortisol on gluconeogenesis may
    occurs rapidly, resulting in an elevation in
    blood glucose.

24
Figure 2. The comparison of pre and post exercise
cortisol levels of each subject tested.
25
  • Gluconeogenesis
  • Onset appears quicker than it was anticipated.
  • Exercise protocol was sufficient to cause a
    cortisol response.
  • Individuals with higher cortisol concentrations
    also exhibited higher glucose concentrations as
    shown in the regression between glucose and
    cortisol after exercise. This is a positive
    direct relationship.
  • The effect of cortisol on gluconeogenesis may
    occurs rapidly, resulting in an elevation in
    blood glucose.

26
Acknowledgements
  • Dr. Day
  • Biology Faculty
  • My Subjects
  • My husband Brinn

27
  • Questions?
About PowerShow.com