Abstract
Purpose: To determine the effects of co-ingesting caffeine (CAF) and carbohydrate (CHO) on high-intensity intermittent sprints (HIS) performance and physiological responses. Methods: Twelve active males underwent 4 interventions at least 7 days apart in a randomized, double-blind, placebo-controlled, balanced trial. A meal contained 65 % CHO was provided 2 h before the HIS test. Participants ingested the placebo (PLA) or CAF (6 mg kg-1 BW) 1 h before taking an HIS test, and ingested a PLA or CHO solution (0.8 g kg -1 BW) before undergoing the testing protocol. The HIS protocol comprised ten sets of 5 × 4-s sprints on a cycle ergometer with a 2-min recovery between each set. Results: There was no significant difference between peak power output and mean power output between trials (p > 0.05). Compared with PLA, CAF + CHO resulted in a 5.2 % reduction in total work, corresponding to a 24.7-25.7 % increase in fatigue at the end stage of the HIS. The administration of CAF + CHO supplementation also resulted in an 11.1 % increase in blood lactate, and elevated blood glucose concentrations throughout HIS testing compared with PLA (p < 0.05). Cortisol concentrations also increased with CAF + CHO intake compared with PLA; however, there was no significant effect of CAF + CHO supplementation on testosterone concentrations. Conclusion: Co-ingestion of CAF and CHO did not improve high-intensity sprint cycling performance or reduce fatigue in active males. Moreover, combined CAF and CHO supplementation might facilitate catabolism during prolonged high-intensity intermittent exercise.
| Original language | English |
|---|---|
| Pages (from-to) | 1533-1543 |
| Number of pages | 11 |
| Journal | European Journal of Applied Physiology |
| Volume | 114 |
| Issue number | 7 |
| DOIs | |
| Publication status | Published - 2014 Jul |
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Keywords
- Anaerobic
- Cortisol
- Fatigue
- Nutrition
- Testosterone
ASJC Scopus subject areas
- Orthopedics and Sports Medicine
- Public Health, Environmental and Occupational Health
- Physiology (medical)
Cite this
Co-ingestion of caffeine and carbohydrate after meal does not improve performance at high-intensity intermittent sprints with short recovery times. / Lee, Chia Lun; Cheng, Ching Feng; Lee, Chia Jung; Kuo, Yu Hsuan; Chang, Wen Dien.
In: European Journal of Applied Physiology, Vol. 114, No. 7, 07.2014, p. 1533-1543.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Co-ingestion of caffeine and carbohydrate after meal does not improve performance at high-intensity intermittent sprints with short recovery times
AU - Lee, Chia Lun
AU - Cheng, Ching Feng
AU - Lee, Chia Jung
AU - Kuo, Yu Hsuan
AU - Chang, Wen Dien
PY - 2014/7
Y1 - 2014/7
N2 - Purpose: To determine the effects of co-ingesting caffeine (CAF) and carbohydrate (CHO) on high-intensity intermittent sprints (HIS) performance and physiological responses. Methods: Twelve active males underwent 4 interventions at least 7 days apart in a randomized, double-blind, placebo-controlled, balanced trial. A meal contained 65 % CHO was provided 2 h before the HIS test. Participants ingested the placebo (PLA) or CAF (6 mg kg-1 BW) 1 h before taking an HIS test, and ingested a PLA or CHO solution (0.8 g kg -1 BW) before undergoing the testing protocol. The HIS protocol comprised ten sets of 5 × 4-s sprints on a cycle ergometer with a 2-min recovery between each set. Results: There was no significant difference between peak power output and mean power output between trials (p > 0.05). Compared with PLA, CAF + CHO resulted in a 5.2 % reduction in total work, corresponding to a 24.7-25.7 % increase in fatigue at the end stage of the HIS. The administration of CAF + CHO supplementation also resulted in an 11.1 % increase in blood lactate, and elevated blood glucose concentrations throughout HIS testing compared with PLA (p < 0.05). Cortisol concentrations also increased with CAF + CHO intake compared with PLA; however, there was no significant effect of CAF + CHO supplementation on testosterone concentrations. Conclusion: Co-ingestion of CAF and CHO did not improve high-intensity sprint cycling performance or reduce fatigue in active males. Moreover, combined CAF and CHO supplementation might facilitate catabolism during prolonged high-intensity intermittent exercise.
AB - Purpose: To determine the effects of co-ingesting caffeine (CAF) and carbohydrate (CHO) on high-intensity intermittent sprints (HIS) performance and physiological responses. Methods: Twelve active males underwent 4 interventions at least 7 days apart in a randomized, double-blind, placebo-controlled, balanced trial. A meal contained 65 % CHO was provided 2 h before the HIS test. Participants ingested the placebo (PLA) or CAF (6 mg kg-1 BW) 1 h before taking an HIS test, and ingested a PLA or CHO solution (0.8 g kg -1 BW) before undergoing the testing protocol. The HIS protocol comprised ten sets of 5 × 4-s sprints on a cycle ergometer with a 2-min recovery between each set. Results: There was no significant difference between peak power output and mean power output between trials (p > 0.05). Compared with PLA, CAF + CHO resulted in a 5.2 % reduction in total work, corresponding to a 24.7-25.7 % increase in fatigue at the end stage of the HIS. The administration of CAF + CHO supplementation also resulted in an 11.1 % increase in blood lactate, and elevated blood glucose concentrations throughout HIS testing compared with PLA (p < 0.05). Cortisol concentrations also increased with CAF + CHO intake compared with PLA; however, there was no significant effect of CAF + CHO supplementation on testosterone concentrations. Conclusion: Co-ingestion of CAF and CHO did not improve high-intensity sprint cycling performance or reduce fatigue in active males. Moreover, combined CAF and CHO supplementation might facilitate catabolism during prolonged high-intensity intermittent exercise.
KW - Anaerobic
KW - Cortisol
KW - Fatigue
KW - Nutrition
KW - Testosterone
UR - http://www.scopus.com/inward/record.url?scp=84902546445&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84902546445&partnerID=8YFLogxK
U2 - 10.1007/s00421-014-2888-8
DO - 10.1007/s00421-014-2888-8
M3 - Article
C2 - 24748531
AN - SCOPUS:84902546445
VL - 114
SP - 1533
EP - 1543
JO - European Journal of Applied Physiology
JF - European Journal of Applied Physiology
SN - 1439-6319
IS - 7
ER -