Effects of acute caffeine intake on sex hormones response and repetitions to failure in resistance-trained females during early follicular phase
Please use this identifier to cite or link to this item:
http://hdl.handle.net/10045/138491
Title: | Effects of acute caffeine intake on sex hormones response and repetitions to failure in resistance-trained females during early follicular phase |
---|---|
Authors: | Abumoh’d, Mohammad Fayiz |
Keywords: | Sport medicine | Health | Muscular endurance | Menstruation | Pituitary | Hypothalamus | Oral contraceptive pills |
Issue Date: | 2024 |
Publisher: | Universidad de Alicante. Área de Educación Física y Deporte |
Citation: | Journal of Human Sport and Exercise. 2024, 19(1): 183-192. https://doi.org/10.14198/jhse.2024.191.16 |
Abstract: | This study investigated the acute effects of caffeine intake on sex hormones (follicle-stimulating hormone, luteinizing hormone, prolactin, oestradiol, and progesterone) following resistance exercise performance during the early follicular phase. In addition, the total number of failed repetitions was determined. Ten resistance-trained females performed two consecutive trials (48 h apart). Participants were randomly assigned to receive either caffeine (4 mg/kg) 1 h before exercise or a placebo, using a double-blind crossover design. Each trial included the following resistance exercises: chest press, lat pulldown, triceps pushdown, and rowing torso. Each exercise was performed in three sets of 10 repetitions at 60% of 1-RM, with a 90 s recovery interval, followed by repetitions to failure at the same intensity during the fourth set. Two-minute breaks were allocated between each exercise’s third and fourth sets of and between exercises. Blood samples were collected from each participant 1 h after the completion of each trial. Data revealed no statistical difference (p ˃ .05) in ergogenic response to caffeine on sex hormones during the early follicular phase between trials. However, serum prolactin level significantly decreased (p = .039) after caffeine intake compared to the placebo. The overall repetitions to failure were significantly higher (p = .023) in the caffeine trial than in the placebo. In conclusion, caffeine intake (4 mg/kg) 1 h before multiple resistance exercises had no effect on sex hormone responses during the early follicular phase, except for prolactin. However, the overall repetitions until failure were higher following caffeine intake. |
URI: | http://hdl.handle.net/10045/138491 |
ISSN: | 1988-5202 |
DOI: | 10.14198/jhse.2024.191.16 |
Language: | eng |
Type: | info:eu-repo/semantics/article |
Rights: | This work is licensed under a Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) |
Peer Review: | si |
Publisher version: | https://doi.org/10.14198/jhse.2024.191.16 |
Appears in Collections: | Journal of Human Sport and Exercise - 2024, Vol. 19, No. 1 |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
JHSE_19-1_16.pdf | 241,43 kB | Adobe PDF | Open Preview | |
Items in RUA are protected by copyright, with all rights reserved, unless otherwise indicated.