Creatine kinase release and clearance using MM variants following repeated bouts of eccentric exercise

Jon-Philippe Hyatt, Priscilla M. Clarkson

Research output: Contribution to journalArticle

43 Citations (Scopus)

Abstract

Purpose: This study investigated the release and clearance of plasma CK- MM (muscle) isoforms following two bouts of eccentric exercise to determine whether enhanced enzyme clearance could in part explain the blunted creatine kinase (CK) response to a second bout of exercise. Methods: Nonweight trained college-aged male subjects performed both bouts of 50 forced lengthening contractions of the forearm flexor muscles separated by 6 d either with the same arm (CON; N = 4) or with one arm followed by the contralateral arm (EXP; N = 4). Range of motion, arm circumference, maximal isometric strength, perceived muscle soreness, total CK (TCK), and MM variants were assessed. Each MM isoform was measured as a percentage of TCK activity and in absolute activity (IU·L-1) following isoelectric separation and densitometry. The MM1:MM3 ratio, calculated from absolute concentrations, was used to indicate periods of release and clearance. Results: Non-CK criterion measures indicated that similar damage occurred in both arms for EXP (P > 0.05), whereas CON exhibited a blunted response on bout 2 (P < 0.01). Postbout 1, TCK peaked at 96 h for CON (3530 ± 927 IU·L-1) and EXP (6683 ± 433 IU·L-1) (P < 0.01). Postbout 2, CON TCK showed no additional increase; however, a second rise in EXP TCK reached its highest point by clay 5 (3602 ± 1190 IU · L-1). Expectedly, %MM1 and the MM1:MM3 ratio were increased after bout I in both groups (P < 0.01). New CK release was observed postbout 2 in both groups as indicated by an increase in %MM1 (P < 0.01), despite no increase in TCK after bout 2 for CON and a smaller CK response for EXP. Conclusion: Accelerated clearance of CK seems to be one factor contributing to the blunted response of this enzyme following a repeated bout of exercise.

Original languageEnglish (US)
Pages (from-to)1059-1065
Number of pages7
JournalMedicine and Science in Sports and Exercise
Volume30
Issue number7
DOIs
StatePublished - Jul 1998
Externally publishedYes

Fingerprint

Creatine Kinase
MM Form Creatine Kinase
Arm
Protein Isoforms
Densitometry
Myalgia
Enzymes
Articular Range of Motion
Forearm
Phosphotransferases
Muscles

Keywords

  • CK Isoforms
  • MM1:MM3 Ratio

ASJC Scopus subject areas

  • Public Health, Environmental and Occupational Health
  • Physical Therapy, Sports Therapy and Rehabilitation
  • Orthopedics and Sports Medicine

Cite this

Creatine kinase release and clearance using MM variants following repeated bouts of eccentric exercise. / Hyatt, Jon-Philippe; Clarkson, Priscilla M.

In: Medicine and Science in Sports and Exercise, Vol. 30, No. 7, 07.1998, p. 1059-1065.

Research output: Contribution to journalArticle

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abstract = "Purpose: This study investigated the release and clearance of plasma CK- MM (muscle) isoforms following two bouts of eccentric exercise to determine whether enhanced enzyme clearance could in part explain the blunted creatine kinase (CK) response to a second bout of exercise. Methods: Nonweight trained college-aged male subjects performed both bouts of 50 forced lengthening contractions of the forearm flexor muscles separated by 6 d either with the same arm (CON; N = 4) or with one arm followed by the contralateral arm (EXP; N = 4). Range of motion, arm circumference, maximal isometric strength, perceived muscle soreness, total CK (TCK), and MM variants were assessed. Each MM isoform was measured as a percentage of TCK activity and in absolute activity (IU·L-1) following isoelectric separation and densitometry. The MM1:MM3 ratio, calculated from absolute concentrations, was used to indicate periods of release and clearance. Results: Non-CK criterion measures indicated that similar damage occurred in both arms for EXP (P > 0.05), whereas CON exhibited a blunted response on bout 2 (P < 0.01). Postbout 1, TCK peaked at 96 h for CON (3530 ± 927 IU·L-1) and EXP (6683 ± 433 IU·L-1) (P < 0.01). Postbout 2, CON TCK showed no additional increase; however, a second rise in EXP TCK reached its highest point by clay 5 (3602 ± 1190 IU · L-1). Expectedly, {\%}MM1 and the MM1:MM3 ratio were increased after bout I in both groups (P < 0.01). New CK release was observed postbout 2 in both groups as indicated by an increase in {\%}MM1 (P < 0.01), despite no increase in TCK after bout 2 for CON and a smaller CK response for EXP. Conclusion: Accelerated clearance of CK seems to be one factor contributing to the blunted response of this enzyme following a repeated bout of exercise.",
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