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The effects of rigorous exercise on muscle glycogen, blood glucose, and carbohydrate utilization in the given two trials.
Given:
A group of seven trained cyclists was included in two cycling trials. On day 1, the athletes were given flavored water (a placebo) at 20 minutes interval throughout the trial. On day 2, the athletes were administered with glucose, again at every 20 minutes interval throughout the trial. The levels of the muscle glycogen and the time taken by muscles to get tired were recorded and are shown in the Table 1.
Table 1: Time taken by the muscles to get tired in response to different drinks.
| Types of drinks ingested by athletes | Levels of muscle glycogen at the starting (0 hours) | Levels of muscle glycogen after 2 hours of cycling | Levels of muscle glycogen after 3 hours of cycling | Levels of muscle glycogen after 4 hours of cycling | Time taken by muscles to get fatigued (hours) |
| Flavored water) Place bo | 163 ± 13 | 60 ± 9 | 37 ± 5 | No data | 3.02 ± 0.19 |
| Glucose Solution | 173 ± 11 | 71 ± 11 | 44 ± 12 | 39 ± 8 0 | 4.02 ± 0.33 |
| P = 0.27 | P = 0.22 | P = 0.30 | P = 0.01 |
Introduction:
Glucose is the source of adenosine triphosphate (ATP) that provides energy by hydrolyzing its phosphate bonds. The glucose is used as a
Explanation of Solution
The probability value (P-value) indicates whether a given data claimed by the experimenter could be accepted or rejected. The data claimed by an experimenter is also known as a null hypothesis. When the P-value is found less than 0.05, the null hypothesis gets rejected. Whereas, if the P-value is found greater than 0.05, the null hypothesis gets accepted.
The given data indicates that glucose level falls after rigorous cycling, but if the glucose is supplied externally, glucose levels were maintained for some time, thereby providing energy. The level of glycogen in muscles remains constant since no breakdown of glycogen is required in case of external administration of glucose. The internal carbohydrates are utilized less frequently because of the presence of externally ingested glucose.
Thus, the P-value greater than 0.05 signifies that the external administration of glucose increase the glucose level in the blood and maintains the muscles’ glycogen level. The carbohydrate degradation also stops as energy is already provided by the external glucose.
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Chapter 47 Solutions
Life: The Science of Biology
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