The effects of sprint (300 m) running on plasma lactate, uric acid, creatine kinase and lactate dehydrogenase in competitive hurdlers and untrained men
B. Klapcinska et al., The effects of sprint (300 m) running on plasma lactate, uric acid, creatine kinase and lactate dehydrogenase in competitive hurdlers and untrained men, J SPORT MED, 41(3), 2001, pp. 306-311
Background. High intensity exercise may induce muscle damage especially in
individuals unaccustomed to regular physical efforts. Our aim was to compar
e the impact of 300 to sprint running on muscle enzymes release into blood
in competitive hurdlers and untrained but physically fit adults.
Methods. Experimental design: comparative study.
Setting: general community.
Participants: nine competitive hurdlers (CH; 21.3 yrs +/- 3.1) and six matc
hed moderately active untrained men (UT).
Interventions: subjects performed a single 300 rn sprint running test.
Measures: plasma creatine kinase (CK) and lactate dehydrogenase (LD) activi
ties, and concentrations of lactate (LA) and uric acid (UA) measured before
the warmup and 5 min, 2 and 20 hrs postrun.
Results. Mean runner performance achieved by CH was significantly better (3
5.53-s +/-0.64) and LA concentrations significantly higher (14.95 mM +/-0.5
9) than those recorded in UT (41.52-s +/-2.22; 10.13 mM +/-0.59). Pre- and
postrun CK activities until the 2nd hour of recovery were found to be signi
ficantly higher (p <0.05) in CH than in UT, whereas LD activities were simi
lar in both groups pretest, but significantly higher in UT immediately post
run. In CH, the highest CK activity (32% increase) was recorded immediately
post-test, whereas in UT the peak CK (135 % increase) was attained in the
20th hour of recovery. In both groups UA reached the peak level in the 2nd
hour of recovery.
Conclusions. More pronounced and delayed postrun increase in CK, as recorde
d in UT, may provide evidence of a larger exercise-induced muscle injury in
the untrained adults. Higher postexercise UA levels as recorded in CH migh
t account for a more marked involvement of adenylate kinase reaction in ATP
resynthesis.