The effect of concurrent endurance and strength training on quantitative estimates of subsarcolemmal and intermyofibrillar mitochondria.
نویسندگان
چکیده
We examined the effect of combined strength and endurance training on quantitative estimates of mitochondria in subsarcolemmal and intermyofibrillar regions of muscle fibers. Ten subjects (five males, five females) participated in a 12 week program of combined strength and endurance training. Seven subjects (three males and four females) served as controls. Biopsy samples from the vastus lateralis were obtained before and after training in both groups and also at the mid-point of training in the exercise group. Measurement of succinate dehydrogenase activity throughout muscle fibers, as a quantitative estimate of mitochondrial subpopulations, revealed no differences between exercise and control groups before and after training. Within the exercise group, there was a significant increase in succinate dehydrogenase activity in all regions of muscle fibers from before to after training. There was also a significant increase in succinate dehydrogenase activity in the subsarcolemmal, relative to the intermyofibrillar region from mid-(six weeks) to after-training ( regional distribution x time; p < 0.05). This may have been associated with an oxidative shift in fiber types, as type I fiber percentage was increased in the exercise, compared to the control group (group x time; p < 0.05). We conclude that mitochondrial populations undergo differential changes throughout training. IMF mitochondria increase in a linear manner throughout training, while SS mitochondria undergo a preferential increase late in training. This increase late in training may be related to an increase in proportion of type I fibers.
منابع مشابه
Exercise training induces a cardioprotective phenotype and alterations in cardiac subsarcolemmal and intermyofibrillar mitochondrial proteins.
Endurance exercise is known to provide cardioprotection against ischemia-reperfusion-induced myocardial injury, and mitochondrial adaptations may play a critical role in this protection. To investigate exercise-induced changes in mitochondrial proteins, we compared the proteome of subsarcolemmal and intermyofibrillar mitochondria isolated from the myocardium of sedentary (control) and exercise-...
متن کاملEffect of concurrent training (endurance-resistance) on serum level of prostate specific antigen (PSA), cardiorespiratory endurance, muscular strength and body composition in men over 50
متن کامل
Effect of Endurance, Resistance and Concurrent training on the Function of the cardiac of healthy middle-aged women
Background & Aim: Cardiac functional adaptations are affected by gender, age, intensity and type of exercise. The aim of this study was to compare the effect of endurance, resistance, concurrent training on the cardiac function. Methods: Forty healthy middle-aged women (mean age 44/62±3/45 years, height 157/75±4/87 cm and weight 73/27±10/64 kg) were randomly divided into four groups (10 person...
متن کاملThe effect of endurance, resistance and concurrent training on the structure of the heart of healthy middle-aged women
Introduction: Exercise plays an important role in promoting cardiovascular function. Also concurrent endurance and resistance training can have different effects on the heart. The purpose of this study was to investigate the effect of endurance, resistance and concurrent resistance and endurance training on the heart structure of healthy middle-aged women. Materials and Methods: Forty healt...
متن کاملEffect of 8-Week Aerobic, Strength and Concurrent Training on Circulating Apelin in Morphine-Dependent Rats
ABSTRACT Background and Objectives: Previous studies have shown that morphine dependence leads to myocardial dysfunction. In addition, apelin plays a protective role in cardiac function. The purpose of this study was to evaluate effects of morphine dependence and three models of exercise training on serum apelin level of dependent and healthy ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
- International journal of sports medicine
دوره 23 1 شماره
صفحات -
تاریخ انتشار 2002