AI Article Synopsis

  • The study examined muscle damage in runners after competing in 35 km and 55 km mountain races by analyzing serum muscle enzymes and specific proteins.* -
  • It found significant increases in muscle enzymes like creatine kinase (CK) and cardiac troponin I (cTnI) after the races, with the 55 km group showing greater muscle damage reflected in slow myosin (SM) changes.* -
  • Results suggest that long-distance mountain races may cause significant damage to type I muscle fibers, even in well-trained runners, indicating the need for further recovery strategies.*

Article Abstract

Consequences of running mountain races on muscle damage were investigated by analysing serum muscle enzymes and fibre-type-specific sarcomere proteins. We studied 10 trained amateur and 6 highly trained runners who ran a 35 km and 55 km mountain trail race (MTR), respectively. Levels of creatine kinase (CK), CK-MB isoform (CK-MB), sarcomeric mitochondrial CK (sMtCK), transaminases (AST and ALT), cardiac troponin I (cTnI) and fast (FM) and slow myosin (SM) isoforms, were assessed before, 1 h, 24 h and 48 h after the beginning of MTR. Significant SM increases were found at 24 h in the 55 km group. Levels of CK, CK-MB, AST and cTnI were significantly elevated in both groups following MTR, but in the 55 km group they tended to stabilize in at 48 h. Using pooled data, time-independent serum peaks of SM and CK-MB were significantly correlated. Moreover, concentration of sMtCK was significantly elevated at 1 and 24 h after the race in the 35 km group. Although training volume could confer protection on the mitochondria, the increase in serum CK-MB and SM in the 55 km group might be related to damage to the contractile apparatus type I fibres. Competing in long-distance MTRs might be related to deeper type I muscle fibre damage, even in highly trained individuals.

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Source
http://dx.doi.org/10.1055/a-0808-4692DOI Listing

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