Muscle damage and its relationship with muscle fatigue during a half-iron triathlon.
BACKGROUND: To investigate the cause/s of muscle fatigue experienced during a half-iron distance triathlon. METHODOLOGY/PRINCIPAL FINDINGS: We recruited 25 trained triathletes (36±7 yr; 75.1±9.8 kg) for the study. Before and just after the race, jump height and leg muscle power output were measured...
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| Format: | Article |
| Language: | English |
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Public Library of Science (PLoS)
2012-01-01
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| Series: | PLoS ONE |
| Online Access: | http://europepmc.org/articles/PMC3416828?pdf=render |
| _version_ | 1811324979819577344 |
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| author | Juan Del Coso Cristina González-Millán Juan José Salinero Javier Abián-Vicén Lidón Soriano Sergio Garde Benito Pérez-González |
| author_facet | Juan Del Coso Cristina González-Millán Juan José Salinero Javier Abián-Vicén Lidón Soriano Sergio Garde Benito Pérez-González |
| author_sort | Juan Del Coso |
| collection | DOAJ |
| description | BACKGROUND: To investigate the cause/s of muscle fatigue experienced during a half-iron distance triathlon. METHODOLOGY/PRINCIPAL FINDINGS: We recruited 25 trained triathletes (36±7 yr; 75.1±9.8 kg) for the study. Before and just after the race, jump height and leg muscle power output were measured during a countermovement jump on a force platform to determine leg muscle fatigue. Body weight, handgrip maximal force and blood and urine samples were also obtained before and after the race. Blood myoglobin and creatine kinase concentrations were determined as markers of muscle damage. RESULTS: Jump height (from 30.3±5.0 to 23.4±6.4 cm; P<0.05) and leg power output (from 25.6±2.9 to 20.7±4.6 W · kg(-1); P<0.05) were significantly reduced after the race. However, handgrip maximal force was unaffected by the race (430±59 to 430±62 N). Mean dehydration after the race was 2.3±1.2% with high inter-individual variability in the responses. Blood myoglobin and creatine kinase concentration increased to 516±248 µg · L(-1) and 442±204 U · L(-1), respectively (P<0.05) after the race. Pre- to post-race jump change did not correlate with dehydration (r = 0.16; P>0.05) but significantly correlated with myoglobin concentration (r = 0.65; P<0.001) and creatine kinase concentration (r = 0.54; P<0.001). CONCLUSIONS/SIGNIFICANCE: During a half-iron distance triathlon, the capacity of leg muscles to produce force was notably diminished while arm muscle force output remained unaffected. Leg muscle fatigue was correlated with blood markers of muscle damage suggesting that muscle breakdown is one of the most relevant sources of muscle fatigue during a triathlon. |
| first_indexed | 2024-04-13T14:25:08Z |
| format | Article |
| id | doaj.art-573a1725bbad4f04b53ed476a87808be |
| institution | Directory Open Access Journal |
| issn | 1932-6203 |
| language | English |
| last_indexed | 2024-04-13T14:25:08Z |
| publishDate | 2012-01-01 |
| publisher | Public Library of Science (PLoS) |
| record_format | Article |
| series | PLoS ONE |
| spelling | doaj.art-573a1725bbad4f04b53ed476a87808be2022-12-22T02:43:20ZengPublic Library of Science (PLoS)PLoS ONE1932-62032012-01-0178e4328010.1371/journal.pone.0043280Muscle damage and its relationship with muscle fatigue during a half-iron triathlon.Juan Del CosoCristina González-MillánJuan José SalineroJavier Abián-VicénLidón SorianoSergio GardeBenito Pérez-GonzálezBACKGROUND: To investigate the cause/s of muscle fatigue experienced during a half-iron distance triathlon. METHODOLOGY/PRINCIPAL FINDINGS: We recruited 25 trained triathletes (36±7 yr; 75.1±9.8 kg) for the study. Before and just after the race, jump height and leg muscle power output were measured during a countermovement jump on a force platform to determine leg muscle fatigue. Body weight, handgrip maximal force and blood and urine samples were also obtained before and after the race. Blood myoglobin and creatine kinase concentrations were determined as markers of muscle damage. RESULTS: Jump height (from 30.3±5.0 to 23.4±6.4 cm; P<0.05) and leg power output (from 25.6±2.9 to 20.7±4.6 W · kg(-1); P<0.05) were significantly reduced after the race. However, handgrip maximal force was unaffected by the race (430±59 to 430±62 N). Mean dehydration after the race was 2.3±1.2% with high inter-individual variability in the responses. Blood myoglobin and creatine kinase concentration increased to 516±248 µg · L(-1) and 442±204 U · L(-1), respectively (P<0.05) after the race. Pre- to post-race jump change did not correlate with dehydration (r = 0.16; P>0.05) but significantly correlated with myoglobin concentration (r = 0.65; P<0.001) and creatine kinase concentration (r = 0.54; P<0.001). CONCLUSIONS/SIGNIFICANCE: During a half-iron distance triathlon, the capacity of leg muscles to produce force was notably diminished while arm muscle force output remained unaffected. Leg muscle fatigue was correlated with blood markers of muscle damage suggesting that muscle breakdown is one of the most relevant sources of muscle fatigue during a triathlon.http://europepmc.org/articles/PMC3416828?pdf=render |
| spellingShingle | Juan Del Coso Cristina González-Millán Juan José Salinero Javier Abián-Vicén Lidón Soriano Sergio Garde Benito Pérez-González Muscle damage and its relationship with muscle fatigue during a half-iron triathlon. PLoS ONE |
| title | Muscle damage and its relationship with muscle fatigue during a half-iron triathlon. |
| title_full | Muscle damage and its relationship with muscle fatigue during a half-iron triathlon. |
| title_fullStr | Muscle damage and its relationship with muscle fatigue during a half-iron triathlon. |
| title_full_unstemmed | Muscle damage and its relationship with muscle fatigue during a half-iron triathlon. |
| title_short | Muscle damage and its relationship with muscle fatigue during a half-iron triathlon. |
| title_sort | muscle damage and its relationship with muscle fatigue during a half iron triathlon |
| url | http://europepmc.org/articles/PMC3416828?pdf=render |
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