Effect of muscle action and metabolic strain on oxidative metabolic responses in human skeletal muscle.
نویسندگان
چکیده
A recent report suggests that differences in aerobic capacity exist between concentric and eccentric muscle action in human muscle (T. W. Ryschon, M. D. Fowler, R. E. Wysong, A. R. Anthony, and R. S. Balaban. J. Appl. Physiol. 83: 867-874, 1997). This study compared oxidative response, in the form of phosphocreatine (PCr) resynthesis rates, with matched levels of metabolic strain (i.e., changes in ADP concentration or the free energy of ATP hydrolysis) in tibialis anterior muscle exercised with either muscle action in vivo (n = 7 subjects). Exercise was controlled and metabolic strain measured by a dynamometer and (31)P-magnetic resonance spectroscopy, respectively. Metabolic strain was varied to bring cytosolic ADP concentration up to 55 microM or decrease the free energy of ATP hydrolysis to -55 kJ/mol with no change in cytoplasmic pH. PCr resynthesis rates after exercise ranged from 31.9 to 462.5 and from 21.4 to 405.4 micromol PCr/s for concentric and eccentric action, respectively. PCr resynthesis rates as a function of metabolic strain were not significantly different between muscle actions (P > 0.40), suggesting that oxidative capacity is dependent on metabolic strain, not muscle action. Pooled data were found to more closely conform to previous biochemical measurements when a term for increasing oxidative capacity with metabolic strain was added to models of respiratory control.
منابع مشابه
Levo-Carnitine Reduces Oxidative Stress and Improves Contractile Functions of Fast Muscles in Type 2 Diabetic Rats
Background: Metabolic derangements in type 2 diabetes mellitus (T2DM) are likely to affect skeletal muscle contractile functions adversely. Levo-carnitine improves muscle contractile functions in healthy humans and rats and corrects metabolic derangements in T2DM. Therefore, it is likely to improve muscle contractile functions in T2DM as well. This study was designed to determine the effect of ...
متن کاملتاثیر یک دوره تمرین مقاومتی بر بیان اینترلوکین-6 و RCAN-1 در عضله اسکلتی موشهای صحرایی دیابتی شده با استروپتوزوسین
Background: Myokines released from skeletal muscle have multiple metabolic and hypertrophic effects. On the other hand, one of proposed pathways for effects of exercise training on metabolic diseases is calcineurin signaling pathway. With considering to relation between interleukin-6 (IL-6) and calcineurin, the purpose of this study was to investigate whether the resistance training has an effe...
متن کاملSports activity done five days before PET/CT results in augmented FDG uptake in skeletal muscles
Increased metabolic activity in muscle secondary to excessive muscle activity during the uptake phase and shortly before FDG injection is a known phenomenon. We present FDG PET/CT findings in a young male, known case of carcinoma maxilla His scan showed diffuse increased metabolic activity in multiple skeletal muscle groups. There was history of unaccustomed, strenuous sports activity of skiing...
متن کاملResponses of Muscle Mitochondrial Function to Physical Activity: A Literature Review
Skeletal muscles play an active role in regulating the metabolic homeostasis through their ability for relating to adipose tissue and endocrine hormones. Contraction of the skeletal muscle leads to increased release of several myokines, such as irisin, which is able to interact with the adipose tissue. Physical activity promotes the irisin mechanism by augmenting the peroxisomes (PGC1-α) in the...
متن کاملBiomonitoring the skeletal muscle metabolic dysfunction in knee osteoarthritis in older adults: Is Jumpstart Nutrition® Supplementation effective?
Background: This study aimed to investigate the efficacy of Jumpstart Nutrition® dietary supplement (JNDS) for enhancing the skeletal muscle metabolism and function of older adults with knee osteoarthritis (KOA) by evaluating the biomarkers of aberrant levels of serum tumor necrosis factor-alpha (TNF-α), interleukin-10 (IL-10), C-reactive protein (CRP), creatine kinase-muscle (CK-MM), and aldol...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Journal of applied physiology
دوره 87 5 شماره
صفحات -
تاریخ انتشار 1999