AI Article Synopsis
- Caffeine intake does not enhance 800-m running performance in trained runners based on a study involving fifteen male athletes.
- While performance metrics and cardiac activity remained unchanged, caffeine significantly worsened sleep quality indicators, including sleep efficiency and the frequency of awakenings.
- Consequently, despite caffeine's potential benefits for athletic performance, its negative impact on sleep quality highlights a trade-off for endurance athletes.
Article Abstract
Background: Caffeine ingestion improves athletic performance, but impairs sleep quality. We aimed to analyze the effect of caffeine intake on 800-m running performance, sleep quality (SQ), and nocturnal cardiac autonomic activity (CAA) in trained runners.
Methods: Fifteen male middle-distance runners participated in the study (aged 23.7 ± 8.2 years). In a randomized and comparative crossover study design, the athletes ingested a placebo (PL) or caffeine supplement (CAF; 6 mg∙kg) one hour before an 800-m running time-trial test in the evening. During the night, CAA and SQ were assessed using actigraphy and a sleep questionnaire. A second 800-m running test was performed 24 h after the first. Time, heart rate, rating of perceived exertion, and blood lactate concentration were analyzed for each running test.
Results: No significant differences in CAA and performance variables were found between the two conditions. However, CAF impaired sleep efficiency ( = 0.003), actual wake time ( = 0.001), and the number of awakenings ( = 0.005), as measured by actigraphy. Also, CAF impaired the questionnaire variables of SQ ( = 0.005), calm sleep ( = 0.005), ease of falling asleep ( = 0.003), and feeling refreshed after waking ( = 0.006).
Conclusion: The supplementation with caffeine (6 mg∙kg) did not improve the 800-m running performance, but did impair the SQ of trained runners.
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|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6770771 | PMC |
| http://dx.doi.org/10.3390/nu11092040 | DOI Listing |
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