Effect of caffeine on maximal oxygen uptake in wheelchair rugby players: A randomized, placebo-controlled, double-blind study
Background: The positive effects of caffeine supplementation on strength-power and endurance performance in healthy athletes have been demonstrated in many studies. A possible mechanism for its ergogenic effect relates to its influence on the central nervous system. Post-traumatic complications in c...
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| Format: | Article |
| Language: | English |
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Palacký University Olomouc
2017-03-01
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| Series: | Acta Gymnica |
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| Online Access: | https://gymnica.upol.cz/artkey/gym-201701-0003_Effect_of_caffeine_on_maximal_oxygen_uptake_in_wheelchair_rugby_players_A_randomized_placebo-controlled_doub.php |
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| author | Iva Klimešová Iva Machová Aleš Jakubec John Corkle |
| author_facet | Iva Klimešová Iva Machová Aleš Jakubec John Corkle |
| author_sort | Iva Klimešová |
| collection | DOAJ |
| description | Background: The positive effects of caffeine supplementation on strength-power and endurance performance in healthy athletes have been demonstrated in many studies. A possible mechanism for its ergogenic effect relates to its influence on the central nervous system. Post-traumatic complications in cervical spinal cord injury affect almost all body systems including the nervous system. For this reason, we expect that caffeine will have a different effect of performance in the group of athletes with spinal cord injuries. Objective: To examine the effects of caffeine supplementation on maximal aerobic power in elite wheelchair rugby players. Methods: Seven elite male wheelchair rugby players with complete cervical-level SCI (C4-Th1) were recruited (mean age: 28 ± 5.42 years; mean body mass index: 26 ± 2.84 kg/m<sup>2</sup>). The effect of caffeine was assessed by an incremental arm ergometer test until volitional exhaustion. The maximal oxygen uptake (VO<sub>2</sub>max/kg), maximum power (W max/kg), peak heart rate (HR peak), and intensity of perceived exertion (RPE) were measured. Participants performed the test twice with a two-week washout period. One hour before each exercise test subjects ingested a capsule of placebo or caffeine (3 mg per kg of body weight). The tests were applied in a double-blind, randomized, repeated-measures, and cross-over design. Wheelchair rugby players were chosen because of the expected high homogeneity of participants - in terms of the type and degree of disability, gender, and age of the players. Results: The monitored parameters were not significantly influenced by caffeine intervention as compared to placebo: VO<sub>2</sub>max/kg (p = .40), W max/kg (p = .34), HR peak (p = .50) and RPE (p = .50). Conclusions: The current findings suggest that a caffeine dose of 3 mg/kg body mass does not improve oxygen uptake and maximal power in elite wheelchair rugby players. |
| first_indexed | 2024-12-12T20:47:08Z |
| format | Article |
| id | doaj.art-c096b33b60424f36815bba18a3d48104 |
| institution | Directory Open Access Journal |
| issn | 2336-4912 2336-4920 |
| language | English |
| last_indexed | 2024-12-12T20:47:08Z |
| publishDate | 2017-03-01 |
| publisher | Palacký University Olomouc |
| record_format | Article |
| series | Acta Gymnica |
| spelling | doaj.art-c096b33b60424f36815bba18a3d481042022-12-22T00:12:32ZengPalacký University OlomoucActa Gymnica2336-49122336-49202017-03-01471162310.5507/ag.2017.001gym-201701-0003Effect of caffeine on maximal oxygen uptake in wheelchair rugby players: A randomized, placebo-controlled, double-blind studyIva Klimešová0Iva Machová1Aleš Jakubec2John Corkle3Faculty of Physical Culture, Palacký University Olomouc, Olomouc, Czech Republic;Faculty of Physical Culture, Palacký University Olomouc, Olomouc, Czech Republic;Faculty of Physical Culture, Palacký University Olomouc, Olomouc, Czech Republic;College of Education, University of Nebraska at Kearney, Kearney, NE, USABackground: The positive effects of caffeine supplementation on strength-power and endurance performance in healthy athletes have been demonstrated in many studies. A possible mechanism for its ergogenic effect relates to its influence on the central nervous system. Post-traumatic complications in cervical spinal cord injury affect almost all body systems including the nervous system. For this reason, we expect that caffeine will have a different effect of performance in the group of athletes with spinal cord injuries. Objective: To examine the effects of caffeine supplementation on maximal aerobic power in elite wheelchair rugby players. Methods: Seven elite male wheelchair rugby players with complete cervical-level SCI (C4-Th1) were recruited (mean age: 28 ± 5.42 years; mean body mass index: 26 ± 2.84 kg/m<sup>2</sup>). The effect of caffeine was assessed by an incremental arm ergometer test until volitional exhaustion. The maximal oxygen uptake (VO<sub>2</sub>max/kg), maximum power (W max/kg), peak heart rate (HR peak), and intensity of perceived exertion (RPE) were measured. Participants performed the test twice with a two-week washout period. One hour before each exercise test subjects ingested a capsule of placebo or caffeine (3 mg per kg of body weight). The tests were applied in a double-blind, randomized, repeated-measures, and cross-over design. Wheelchair rugby players were chosen because of the expected high homogeneity of participants - in terms of the type and degree of disability, gender, and age of the players. Results: The monitored parameters were not significantly influenced by caffeine intervention as compared to placebo: VO<sub>2</sub>max/kg (p = .40), W max/kg (p = .34), HR peak (p = .50) and RPE (p = .50). Conclusions: The current findings suggest that a caffeine dose of 3 mg/kg body mass does not improve oxygen uptake and maximal power in elite wheelchair rugby players.https://gymnica.upol.cz/artkey/gym-201701-0003_Effect_of_caffeine_on_maximal_oxygen_uptake_in_wheelchair_rugby_players_A_randomized_placebo-controlled_doub.phpParalympicathletic performancecaffeinewheelchair rugby |
| spellingShingle | Iva Klimešová Iva Machová Aleš Jakubec John Corkle Effect of caffeine on maximal oxygen uptake in wheelchair rugby players: A randomized, placebo-controlled, double-blind study Acta Gymnica Paralympic athletic performance caffeine wheelchair rugby |
| title | Effect of caffeine on maximal oxygen uptake in wheelchair rugby players: A randomized, placebo-controlled, double-blind study |
| title_full | Effect of caffeine on maximal oxygen uptake in wheelchair rugby players: A randomized, placebo-controlled, double-blind study |
| title_fullStr | Effect of caffeine on maximal oxygen uptake in wheelchair rugby players: A randomized, placebo-controlled, double-blind study |
| title_full_unstemmed | Effect of caffeine on maximal oxygen uptake in wheelchair rugby players: A randomized, placebo-controlled, double-blind study |
| title_short | Effect of caffeine on maximal oxygen uptake in wheelchair rugby players: A randomized, placebo-controlled, double-blind study |
| title_sort | effect of caffeine on maximal oxygen uptake in wheelchair rugby players a randomized placebo controlled double blind study |
| topic | Paralympic athletic performance caffeine wheelchair rugby |
| url | https://gymnica.upol.cz/artkey/gym-201701-0003_Effect_of_caffeine_on_maximal_oxygen_uptake_in_wheelchair_rugby_players_A_randomized_placebo-controlled_doub.php |
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