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KMID : 0378019910340040099
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New Medical Journal
1991 Volume.34 No. 4 p.99 ~ p.106
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Influence of Caffeine Ingestion on Endurance Performance
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Abstract
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5 female students majoring in public health ranging from 19-21 years were studied to determine influence of caffeine ingestion on endurance performance.
For caffeine ingestion group, 5mg /kg body weight of caffeine in 400rrm1 of artificially sweetened barley tea was ingested twice 65 min. and 40 min. prior to the exercise.
For the control group, 400m1 of artificially sweetened decaffeinated coffee was ingested as caffeine ingestion group.
A double-blind procedure was followed.
Workload was given all subjects with treadmill by 55 min, (2.7 MPH by 10 min, 3.7 MPH by 40 min. and 5.0 MPH by 55 min.)
The results obtained are summarized as follows
1. Plasma FFA level in caffeine ingestion group was significantly higher than that of the control group at rest, immediately after exercise, and all recovery period.
2. Plasma calcium level was not affected caffeine ingestion. Both group was significantly higher than resting level at immediately after exercise and then restored to resting level.
3. No significant difference in plasma glucose concentrations were found between the two plasma glucose concentrations were significantly fallen under resting level at 30 minutes of recovery period.
4. Heart rate was not affected caffeine ingestion, but heart rate in caffeine ingestion group was significantly higher than that of control group.
5. Systolic and diastolic blood pressure were significant difference in both groups.
Based on the results of this experiment, it would appear that caffeine is beneficial in exercising performance.
However, it should be noted that higher dosages could possibly elicit an ergogenic effect. Further research is thus recommended.
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