title: Serum hormone and myocellular protein recovery after intermittent runs at the velocity associated with VO(2max).
abstract: The responses of serum myocellular proteins and hormones to exercise were studied in ten well-trained middle-distance runners [maximal oxygen consumption (VO(2max)) = 69.4 (5.1) ml x kg(-1) x min(-1)] during 3 recovery days and compared to various measures of physical performance. The purpose was to establish the duration of recovery from typical intermittent middle-distance running exercises. The subjects performed, in random, order two 28-min treadmill running exercises at a velocity associated with VO(2max): 14 bouts of 60-s runs with 60 s of rest between each run (IR(60)) and 7 bouts of 120-s runs with 120 s of rest between each run (IR(120)). Before the exercises (pre- exercise), 2 h after, and 1, 2 and 3 days after the exercises, the same series of measurements were performed, including those for serum levels of the myocellular proteins creatine kinase, myoglobin and carbonic anhydrase III (S-CK, S-Mb and S-CA III, respectively), serum hormones testosterone, Luteinizing hormone, follicle-stimulating hormone and cortisol (S-testosterone, S-LH, S-FSH and S-cortisol, respectively) and various performance parameters: maximal vertical jump height (CMJ) and stride length, heart rate and ratings of perceived exertion during an 8-min run at 15 km x h(-1) (SL(15 km x h(-1)), HR(15 km x h(-1)) and RPE(15 km x h(-1)), respectively). Two hours after the end of both exercise bouts the concentration of each measured serum protein had increased significantly (P < 0.001) compared to the pre-exercise level, but there were no changes in SL(15 km x h(-1)) or CMJ. During the recovery days only S-CK was significantly raised (P < 0.01), concomitant with a decrease in CMJ (P < 0.01) and an increase in RPE(15 km x h(-1)) (P < 0.01). Hormone levels remained unchanged compared to the pre-exercise levels during the recovery days and there were no significant differences between the two exercise bouts in any of the observed post-exercise day-to-day responses. With the exception of S-CK, after IR(120) the post-exercise responses returned to their pre-exercise levels within the 3 days of recovery. The present findings suggest that a single 28-min intermittent middle-distance running exercise does not induce changes in serum hormones of well-trained runners during recovery over 3 days, while changes in S-CK, CMJ and RPE(15 km x h(-1)) indicate that 2-3 days of light training may be needed before the recovery at muscle level is complete.
authors.affiliation: Sport Institute of Finland, FIN 19120 Vierumäki, Finland. timo.vuorimaa@vierumaki.fi
authors.forename: T
authors.initials: T
authors.lastname: Vuorimaa
authors.forename: T
authors.initials: T
authors.lastname: Vasankari
authors.forename: K
authors.initials: K
authors.lastname: Mattila
authors.forename: O
authors.initials: O
authors.lastname: Heinonen
authors.forename: K
authors.initials: K
authors.lastname: Häkkinen
authors.forename: H
authors.initials: H
authors.lastname: Rusko
mesh_terms: D000328:Adult; D002256:Carbonic Anhydrases / Q000097:blood; D003402:Creatine Kinase / Q000097:blood; D005640:Follicle Stimulating Hormone / Q000097:blood; D006728:Hormones / Q000097:blood*; D006801:Humans; D006854:Hydrocortisone / Q000097:blood; D007986:Luteinizing Hormone / Q000097:blood; D008297:Male; D009124:Muscle Proteins / Q000097:blood*; D009211:Myoglobin / Q000097:blood; D010101:Oxygen Consumption; D012420:Running / Q000502:physiology*; D013739:Testosterone / Q000097:blood
chemical_list: D006728:Hormones; D009124:Muscle Proteins; D009211:Myoglobin; D013739:Testosterone; D007986:Luteinizing Hormone; D005640:Follicle Stimulating Hormone; D003402:Creatine Kinase; D002256:Carbonic Anhydrases; D006854:Hydrocortisone