CARDIO-METABOLIC ADAPTATIONS TO MARATHON TRAINING

Single muscle fiber adaptations with marathon training.

The purpose of this investigation was to characterize the effects of marathon training on single muscle fiber contractile function in a group of recreational runners. Muscle biopsies were obtained from the gastrocnemius muscle of seven individuals (22 +/- 1 yr, 177 +/- 3 cm, and 68 +/- 2 kg) before, after 13 wk of run training, and after 3 wk of taper. Slow-twitch myosin heavy chain [(MHC) I] a...

Myocardial adaptations to recreational marathon training among middle-aged men.

BACKGROUND Myocardial adaptations to exercise have been well documented among competitive athletes. To what degree cardiac remodeling occurs among recreational exercisers is unknown. We sought to evaluate the effect of recreational marathon training on myocardial structure and function comprehensively. METHODS AND RESULTS Male runners (n=45; age, 48±7 years; 64% with ≥1 cardiovascular risk fa...

Metabolic Training Principles and Adaptations

- - Metabolic Adaptations to Endurance Training : Increased Fat Oxidation

Endurance exercise training elicits physiological adaptations within the body. One of the adaptations observed with endurance training is the body's ability to oxidize increased amounts of fat as energy during exercise. A critical role in this energy substrate shift is mediated by the mitochondria. The mechanisms for adaptation at the mitochondria and their relative importance to the energy sub...

Cardiovascular Adaptations to Exercise Training.

Aerobic exercise training leads to cardiovascular changes that markedly increase aerobic power and lead to improved endurance performance. The functionally most important adaptation is the improvement in maximal cardiac output which is the result of an enlargement in cardiac dimension, improved contractility, and an increase in blood volume, allowing for greater filling of the ventricles and a ...