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المؤلفBrooks, Joseph H
المؤلفWyld, Kevin
المؤلفChrismas, Bryna CR
تاريخ الإتاحة2017-02-09T09:30:10Z
تاريخ النشر2015-12-20
اسم المنشورJournal of Athletic Enhancement
المعرّفhttp://dx.doi.org/10.4172/2324-9080.1000217
الاقتباسBrooks JH, Wyld K, Chrismas BCR (2015) Acute Effects of Caffeine on Strength Performance in Trained and Untrained Individuals. J Athl Enhancement 4:6.
الرقم المعياري الدولي للكتاب2324-9080
معرّف المصادر الموحدhttp://hdl.handle.net/10576/5229
الملخصObjective: The primary aim of this study was to compare the acute effects of a caffeine based supplement on the strength performance of trained and untrained individuals with a secondary investigation into the effects of a placebo. Method: Seven resistance trained (>6 months) and seven untrained (<6 months) males (mean ± SD: age: 21 ± 3 y, mass: 75.2 ± 11.3 kg, height: 176 ± 6 cm) consumed either caffeine (CAF) (5 mg.kg.bw-1), placebo (PLA) or nothing (CON) 60 minutes prior to 1 RM squat measurements in a double-blinded, repeated measures design. A two way repeated measures ANOVA was applied to test for the main effects of condition (CAF, PLA, CON) and group (Trained, Untrained), and the interaction effect (condition x group). Results: A significant interaction effect (F(2,11)=4.38, p=0.024) for 1 RM was observed. In the untrained group there was significant difference between CON and PLA (p<0.001). On average 1 RM in the untrained group was 12% lower in the CON trial (92.1 kg) compared to the PLA (102.9 kg; 95% CI=-5.3 to -16.1 kg), and 9% lower compared to CAF (p=0.005; 95% CI=-2.7 to 14.5 kg). There was no significant difference in 1 RM in the untrained group between PLA and CAF (p=0.87, 95% CI -3.2 to 7.5 kg). Additionally, there were no significant differences for the trained group between conditions. There was also a significant main effect for condition for 1 RM (F(2,11)=12.81, p<0.001) . Overall the CON trial was 6% lower (p=0.001, 95% CI=-3.0 to -10.6 kg) than the PLA trial (117.9 kg; 95% CI 97.6 to 124.6 kg), and 5% lower (p=0.12, 95% CI=-1.2 to -9.5 kg) than the CAF trial (116.4 kg; 95% CI 105.0 to 127.8 kg). There was no significant difference between PLA and CAF (p=0.951). Finally, there was a significant main effect for group (F(1,12)=8.79, p=0.12). On average 1 RM was 25% higher in the trained group (131.7 kg; 95% CI=114.5 to 148.9 kg) compared to the untrained group (98.6 kg; 95% CI=81.4 to 115.8 kg). Conclusion: These findings suggest that both a caffeine supplementation and placebo improve 1 RM in untrained individuals but do not improve performance in resistance trained athletes. No significant differences between caffeine and placebo, suggests placebo induced mechanisms also need to be considered
اللغةen
الناشرSciTechnol
الموضوعone repetition maximum
squat
placebo
force
muscle activation
supplementation
العنوانAcute Effects of Caffeine on Strength Performance in Trained and Untrained Individuals
النوعArticle
رقم العدد6
رقم المجلد4
dc.accessType Open Access


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