Women Experience the Same Ergogenic Response to Caffeine as Men
This study aimed to determine whether 1) consumption of caffeine improves endurance cycling performance in women and 2) sex differences exist in the magnitude of the ergogenic and plasma responses to caffeine supplementation. Twenty-seven (11 women and 16 men) endurance-trained cyclists and triathle...
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Published in | Medicine and science in sports and exercise Vol. 51; no. 6; p. 1195 |
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Main Authors | , , , , , , , |
Format | Journal Article |
Language | English |
Published |
United States
01.06.2019
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Subjects | |
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Abstract | This study aimed to determine whether 1) consumption of caffeine improves endurance cycling performance in women and 2) sex differences exist in the magnitude of the ergogenic and plasma responses to caffeine supplementation.
Twenty-seven (11 women and 16 men) endurance-trained cyclists and triathletes participated in this randomized, double-blind, placebo-controlled, crossover study. Participants completed an incremental exercise test to exhaustion, two familiarization trials, and two performance trials. Ninety minutes before the performance trials, participants ingested opaque capsules containing either 3 mg·kg body mass of anhydrous caffeine or a placebo. They then completed a set amount of work (75% of peak sustainable power output) in the fastest possible time. Plasma was sampled at baseline, preexercise, and postexercise for caffeine. Strict standardization and verification of diet, hydration, training volume and intensity, and contraceptive hormone phase (for women) were implemented.
Performance time was significantly improved after caffeine administration in women (placebo: 3863 ± 419 s, caffeine: 3757 ± 312 s; P = 0.03) and men (placebo: 3903 ± 341 s, caffeine: 3734 ± 287 s; P < 0.001). The magnitude of performance improvement was similar for women (mean = 4.3%, 95% CI = 0.4%-8.2%) and men (4.6%, 2.3%-6.8%). Plasma caffeine concentrations were similar between sexes before exercise, but significantly greater in women after exercise (P < 0.001).
Ingestion of 3 mg·kg body mass of caffeine enhanced endurance exercise performance in women. The magnitude of the performance enhancement observed in women was similar to that of men, despite significantly greater plasma caffeine concentrations after exercise in women. These results suggest that the current recommendations for caffeine intake (i.e., 3-6 mg·kg caffeine before exercise to enhance endurance performance), which are derived almost exclusively from studies on men, may also be applicable to women. |
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AbstractList | This study aimed to determine whether 1) consumption of caffeine improves endurance cycling performance in women and 2) sex differences exist in the magnitude of the ergogenic and plasma responses to caffeine supplementation.
Twenty-seven (11 women and 16 men) endurance-trained cyclists and triathletes participated in this randomized, double-blind, placebo-controlled, crossover study. Participants completed an incremental exercise test to exhaustion, two familiarization trials, and two performance trials. Ninety minutes before the performance trials, participants ingested opaque capsules containing either 3 mg·kg body mass of anhydrous caffeine or a placebo. They then completed a set amount of work (75% of peak sustainable power output) in the fastest possible time. Plasma was sampled at baseline, preexercise, and postexercise for caffeine. Strict standardization and verification of diet, hydration, training volume and intensity, and contraceptive hormone phase (for women) were implemented.
Performance time was significantly improved after caffeine administration in women (placebo: 3863 ± 419 s, caffeine: 3757 ± 312 s; P = 0.03) and men (placebo: 3903 ± 341 s, caffeine: 3734 ± 287 s; P < 0.001). The magnitude of performance improvement was similar for women (mean = 4.3%, 95% CI = 0.4%-8.2%) and men (4.6%, 2.3%-6.8%). Plasma caffeine concentrations were similar between sexes before exercise, but significantly greater in women after exercise (P < 0.001).
Ingestion of 3 mg·kg body mass of caffeine enhanced endurance exercise performance in women. The magnitude of the performance enhancement observed in women was similar to that of men, despite significantly greater plasma caffeine concentrations after exercise in women. These results suggest that the current recommendations for caffeine intake (i.e., 3-6 mg·kg caffeine before exercise to enhance endurance performance), which are derived almost exclusively from studies on men, may also be applicable to women. |
Author | Leveritt, Michael D Skinner, Tina L Arapova, Julia Schaumberg, Mia A Osborne, John Anoopkumar-Dukie, Shailendra Desbrow, Ben Grant, Gary D |
Author_xml | – sequence: 1 givenname: Tina L surname: Skinner fullname: Skinner, Tina L organization: School of Human Movement and Nutrition Sciences, The University of Queensland, Queensland, AUSTRALIA – sequence: 2 givenname: Ben surname: Desbrow fullname: Desbrow, Ben organization: Menzies Health Institute Queensland, Griffith University, Queensland, AUSTRALIA – sequence: 3 givenname: Julia surname: Arapova fullname: Arapova, Julia organization: School of Human Movement and Nutrition Sciences, The University of Queensland, Queensland, AUSTRALIA – sequence: 4 givenname: Mia A surname: Schaumberg fullname: Schaumberg, Mia A organization: School of Health and Sports Sciences, University of the Sunshine Coast, Queensland, AUSTRALIA – sequence: 5 givenname: John surname: Osborne fullname: Osborne, John organization: School of Exercise and Nutrition Sciences and Institute of Health and Biomedical Innovation, Queensland University of Technology, Queensland, AUSTRALIA – sequence: 6 givenname: Gary D surname: Grant fullname: Grant, Gary D organization: Quality Use of Medicines Network, School of Pharmacy and Pharmacology, Griffith University, Queensland, AUSTRALIA – sequence: 7 givenname: Shailendra surname: Anoopkumar-Dukie fullname: Anoopkumar-Dukie, Shailendra organization: Quality Use of Medicines Network, School of Pharmacy and Pharmacology, Griffith University, Queensland, AUSTRALIA – sequence: 8 givenname: Michael D surname: Leveritt fullname: Leveritt, Michael D organization: School of Human Movement and Nutrition Sciences, The University of Queensland, Queensland, AUSTRALIA |
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SubjectTerms | Adult Bicycling - physiology Body Mass Index Caffeine - administration & dosage Caffeine - blood Central Nervous System Stimulants - administration & dosage Central Nervous System Stimulants - blood Cross-Over Studies Double-Blind Method Female Heart Rate - physiology Humans Male Performance-Enhancing Substances - administration & dosage Performance-Enhancing Substances - blood Physical Endurance - physiology Sex Factors Young Adult |
Title | Women Experience the Same Ergogenic Response to Caffeine as Men |
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