Beta-hydroxy-beta-methylbutyrate supplementation preserves fat-free mass in collegiate boxers during acute body mass loss
Acute body mass loss before competitions in combat sports usually leads to loss in fat-free mass. Beta-hydroxy-beta-methylbutyrate (HMB) has been shown to increase skeletal muscle mass and muscle strength in various muscle wasting conditions. This study investigated the effect of HMB supplementation...
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| Format: | Article |
| Language: | English |
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Wolters Kluwer Medknow Publications
2023-01-01
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| Series: | Chinese Journal of Physiology |
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| Online Access: | http://www.cjphysiology.org/article.asp?issn=0304-4920;year=2023;volume=66;issue=6;spage=485;epage=493;aulast=Chang |
| _version_ | 1797352243556515840 |
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| author | Chen-Kang Chang Shih-Yen Kao Chung-Yuan Wang |
| author_facet | Chen-Kang Chang Shih-Yen Kao Chung-Yuan Wang |
| author_sort | Chen-Kang Chang |
| collection | DOAJ |
| description | Acute body mass loss before competitions in combat sports usually leads to loss in fat-free mass. Beta-hydroxy-beta-methylbutyrate (HMB) has been shown to increase skeletal muscle mass and muscle strength in various muscle wasting conditions. This study investigated the effect of HMB supplementation on body composition and sport-specific performance in well-trained boxers consuming a hypocaloric diet. Twelve male college boxers were divided into the HMB and placebo (PLA) groups using a body weight-matched single-blind parallel design. The study comprised a 6-day weight loss period (days 1–6), followed by a 3-day competition period (days 7–9). The participants in both the groups consumed 16 kcal/kg/day, including 1.6–1.7 g/kg of carbohydrates, 1.2–1.3 g/kg of protein, and 0.45–0.5 g/kg of fat during the 9-day period. The HMB group consumed 3 g/day HMB. Body composition measurement, isometric mid-thigh pull (IMTP), and a simulated boxing match were performed at baseline and on days 7, 8, and 9. Fasting blood samples were collected on the day before day 1 and on days 7, 8, and 9. Body mass was significantly decreased after the 6-day weight loss period (HMB group: baseline: 69.4 ± 11.2 kg, day 7: 67.1 ± 11.2 kg; PLA group: baseline: 68.6 ± 12.1 kg, day 7: 65.7 ± 11.5 kg, P < 0.05) while it was unchanged on the 3-day competition period in both the groups. Fat-free mass in the HMB group was maintained throughout the 9-day period (baseline: 56.7 ± 9.3 kg, day 7: 56.3 ± 8.7 kg, day 9: 55.8 ± 9.5 kg) whereas it significantly decreased on days 7 and 9 compared to the baseline in the PLA group (baseline: 55.2 ± 6.4 kg, day 7: 54.1 ± 6.6 kg, day 9: 54.0 ± 6.6 kg, P < 0.05). In the PLA group, the average and maximal heart rates in round 1 and the average heart rate in round 2 on days 8 and 9 were significantly lower than those at baseline, while these parameters were unchanged in the HMB group. The maximal force and the rate of force development in the IMTP remained unchanged among the different timepoints in both the groups. The blood biochemical parameters were similar at any timepoint between the PLA and HMB groups. HMB supplementation during acute weight loss may preserve fat-free mass and maintain heart rate response in subsequent simulated matches in well-trained boxers. In addition, HMB supplementation had a nonsignificant effect on glucose, fat, and protein metabolism during energy restriction. |
| first_indexed | 2024-03-08T13:12:28Z |
| format | Article |
| id | doaj.art-97fb740f20fd43899b5fc0bbd7915961 |
| institution | Directory Open Access Journal |
| issn | 0304-4920 2666-0059 |
| language | English |
| last_indexed | 2024-03-08T13:12:28Z |
| publishDate | 2023-01-01 |
| publisher | Wolters Kluwer Medknow Publications |
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| series | Chinese Journal of Physiology |
| spelling | doaj.art-97fb740f20fd43899b5fc0bbd79159612024-01-18T11:09:09ZengWolters Kluwer Medknow PublicationsChinese Journal of Physiology0304-49202666-00592023-01-0166648549310.4103/cjop.CJOP-D-23-00074Beta-hydroxy-beta-methylbutyrate supplementation preserves fat-free mass in collegiate boxers during acute body mass lossChen-Kang ChangShih-Yen KaoChung-Yuan WangAcute body mass loss before competitions in combat sports usually leads to loss in fat-free mass. Beta-hydroxy-beta-methylbutyrate (HMB) has been shown to increase skeletal muscle mass and muscle strength in various muscle wasting conditions. This study investigated the effect of HMB supplementation on body composition and sport-specific performance in well-trained boxers consuming a hypocaloric diet. Twelve male college boxers were divided into the HMB and placebo (PLA) groups using a body weight-matched single-blind parallel design. The study comprised a 6-day weight loss period (days 1–6), followed by a 3-day competition period (days 7–9). The participants in both the groups consumed 16 kcal/kg/day, including 1.6–1.7 g/kg of carbohydrates, 1.2–1.3 g/kg of protein, and 0.45–0.5 g/kg of fat during the 9-day period. The HMB group consumed 3 g/day HMB. Body composition measurement, isometric mid-thigh pull (IMTP), and a simulated boxing match were performed at baseline and on days 7, 8, and 9. Fasting blood samples were collected on the day before day 1 and on days 7, 8, and 9. Body mass was significantly decreased after the 6-day weight loss period (HMB group: baseline: 69.4 ± 11.2 kg, day 7: 67.1 ± 11.2 kg; PLA group: baseline: 68.6 ± 12.1 kg, day 7: 65.7 ± 11.5 kg, P < 0.05) while it was unchanged on the 3-day competition period in both the groups. Fat-free mass in the HMB group was maintained throughout the 9-day period (baseline: 56.7 ± 9.3 kg, day 7: 56.3 ± 8.7 kg, day 9: 55.8 ± 9.5 kg) whereas it significantly decreased on days 7 and 9 compared to the baseline in the PLA group (baseline: 55.2 ± 6.4 kg, day 7: 54.1 ± 6.6 kg, day 9: 54.0 ± 6.6 kg, P < 0.05). In the PLA group, the average and maximal heart rates in round 1 and the average heart rate in round 2 on days 8 and 9 were significantly lower than those at baseline, while these parameters were unchanged in the HMB group. The maximal force and the rate of force development in the IMTP remained unchanged among the different timepoints in both the groups. The blood biochemical parameters were similar at any timepoint between the PLA and HMB groups. HMB supplementation during acute weight loss may preserve fat-free mass and maintain heart rate response in subsequent simulated matches in well-trained boxers. In addition, HMB supplementation had a nonsignificant effect on glucose, fat, and protein metabolism during energy restriction.http://www.cjphysiology.org/article.asp?issn=0304-4920;year=2023;volume=66;issue=6;spage=485;epage=493;aulast=Changbody compositionboxingisometric mid-thigh pullsimulated boxing match |
| spellingShingle | Chen-Kang Chang Shih-Yen Kao Chung-Yuan Wang Beta-hydroxy-beta-methylbutyrate supplementation preserves fat-free mass in collegiate boxers during acute body mass loss Chinese Journal of Physiology body composition boxing isometric mid-thigh pull simulated boxing match |
| title | Beta-hydroxy-beta-methylbutyrate supplementation preserves fat-free mass in collegiate boxers during acute body mass loss |
| title_full | Beta-hydroxy-beta-methylbutyrate supplementation preserves fat-free mass in collegiate boxers during acute body mass loss |
| title_fullStr | Beta-hydroxy-beta-methylbutyrate supplementation preserves fat-free mass in collegiate boxers during acute body mass loss |
| title_full_unstemmed | Beta-hydroxy-beta-methylbutyrate supplementation preserves fat-free mass in collegiate boxers during acute body mass loss |
| title_short | Beta-hydroxy-beta-methylbutyrate supplementation preserves fat-free mass in collegiate boxers during acute body mass loss |
| title_sort | beta hydroxy beta methylbutyrate supplementation preserves fat free mass in collegiate boxers during acute body mass loss |
| topic | body composition boxing isometric mid-thigh pull simulated boxing match |
| url | http://www.cjphysiology.org/article.asp?issn=0304-4920;year=2023;volume=66;issue=6;spage=485;epage=493;aulast=Chang |
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