Impaired exercise performance and muscle Na(+),K(+)-pump activity in renal transplantation and haemodialysis patients
| Autor: | Annette B. Kent, Aaron C. Petersen, Xiaofei Gong, Lawrence P. McMahon, Kate T. Murphy, Michael J. McKenna, Murray J. Leikis |
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| Rok vydání: | 2011 |
| Předmět: |
Adult
Male medicine.medical_specialty Urology Oxygen Consumption Renal Dialysis Internal medicine medicine Humans Exercise physiology Na+/K+-ATPase Muscle Skeletal Exercise Kidney transplantation Transplantation Muscle fatigue business.industry Case-control study Skeletal muscle Middle Aged medicine.disease Kidney Transplantation Isoenzymes Endocrinology medicine.anatomical_structure Nephrology Case-Control Studies Chronic Disease Muscle Fatigue Potassium Female Kidney Diseases Sodium-Potassium-Exchanging ATPase business Cation transport |
| Zdroj: | Nephrology, dialysis, transplantation : official publication of the European Dialysis and Transplant Association - European Renal Association. 27(5) |
| ISSN: | 1460-2385 |
| Popis: | We examined whether abnormal skeletal muscle Na(+),K(+)-pumps underlie impaired exercise performance in haemodialysis patients (HDP) and whether these are improved in renal transplant recipients (RTx).Peak oxygen consumption ( O(2peak)) and plasma [K(+)] were measured during incremental exercise in 9RTx, 10 HDP and 10 healthy controls (CON). Quadriceps peak torque (PT), fatigability (decline in strength during thirty contractions), thigh muscle cross-sectional area (TMCSA) and vastus lateralis Na(+),K(+)-pump maximal activity, content and isoform (α(1)-α(3), β(1)-β(3)) abundance were measured.O(2peak) was 32 and 35% lower in RTx and HDP than CON, respectively (P0.05). PT was less in RTx and HDP than CON (P0.05) but did not differ when expressed relative to TMCSA. Fatigability was ∼1.6-fold higher in RTx (24 ± 11%) and HDP (25 ± 4%) than CON (15 ± 5%, P0.05). Na(+),K(+)-pump activity was 28 and 31% lower in RTx and HDP, respectively than CON (P0.02), whereas content and isoform abundance did not differ. Pooled (n = 28) O(2peak) correlated with Na(+),K(+)-pump activity (r = 0.45, P = 0.02).O(2peak) and muscle Na(+),K(+)-pump activity were depressed and muscle fatigability increased in HDP, with no difference observed in RTx. These findings are consistent with the possibility that impaired exercise performance in HDP and RTx may be partially due to depressed muscle Na(+),K(+)-pump activity and relative TMCSA. |
| Databáze: | OpenAIRE |
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