Elham Motamedi; Maryam Ebrahimi; Abuzar Jorbonian
Abstract
Background: This study aimed to investigate the effect of caffeine and carbohydrate co-ingestion on anaerobic performance and muscular strength of female wushu athletes. Methods: 7 female wushu athletes with 22.00 ± 6.11 years of age, 52.96 ± 4.87 kg weight and 161.29 ± 5.28 cm height ...
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Background: This study aimed to investigate the effect of caffeine and carbohydrate co-ingestion on anaerobic performance and muscular strength of female wushu athletes. Methods: 7 female wushu athletes with 22.00 ± 6.11 years of age, 52.96 ± 4.87 kg weight and 161.29 ± 5.28 cm height participated in 1RM leg and bench press and RAST tests on 4 occasions separated by 1-week washout after accidental consumption of caffeine (6 mg/kg in 250 mL water), 8% carbohydrate (21 g in 250 mL water), caffeine+carbohydrate and placebo. Data were analyzed by repeated measure ANOVA and Bonferroni tests in SPSS26, α = 0.05).Results: caffeine alone did not affect variables (P ≥ 0.05). Carbohydrate consumption increased 1RM bench press ⁓7% (P = 0.010) and 1RM leg press ⁓16% (P = 0.033). co-ingestion of carbohydrate and caffeine improved mean power ⁓15% (P = 0.027), 1RM bench press ⁓26% (P = 0.005) and leg press ⁓39% (P = 0.027). Conclusion: it seems, that carbohydrate has more effect on strength than caffeine, but combined with caffeine it may improve mean power besides the muscular strength in female wushu athletes due to effects on the central nervous system and increasing carbohydrate effect.
Maryam Ebrahimi
Abstract
Objective: in this research, levels of metabolic enzymes, pyruvate dehydrogenase kinase 4 (PDK-4) and carnitine palmitoyltransferase 1 (CPT-1) and their relationship with blood glucose, lactate and lipid profile were studied in response to a single bout of Crossfit exercise in fasting and fed state.Methods: ...
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Objective: in this research, levels of metabolic enzymes, pyruvate dehydrogenase kinase 4 (PDK-4) and carnitine palmitoyltransferase 1 (CPT-1) and their relationship with blood glucose, lactate and lipid profile were studied in response to a single bout of Crossfit exercise in fasting and fed state.Methods: 23 healthy female sport science students with minimum of 3 years regular training were randomly assigned into fast control, fed control, fast Crossfit and fed Crossfit groups. At the end of the session, rating of perceived exertion was estimated by OMNI scale and blood samples were collected. Two-way analysis of variances and Pearson test were used at the alpha level .05 in SPSS 22. Results: glucose, TG, cholesterol, LDL, HDL, PDK-4 and CPT-1 mean levels had not any significant differences between groups (P > .05). Plasma lactate level was higher in Crossfit groups compared to controls (P = .045). Serum PDK-4 was positively correlated with CPT-1 (r = .550, P = .007) and negatively correlated with lactate levels (r = .600, P = .003). Conclusion: fasting and feeding had not any effect on metabolic indices, nor in resting neither after exercise. Higher lactate levels after Crossfit exercise and no difference in PDK-4 and CPT-1 compared with resting, probably suggest more contribution of glucose for energy production via aerobic and anaerobic pathways in this protocol.
