Differences in neuromuscular fatigue after aerobic and anaerobic running loads
Journal Title: Biology of Sport - Year 2008, Vol 25, Issue 4
Abstract
The aim of the research was to establish some characteristics and differences in neuromuscular fatigue after different running loads. Seven well-trained runners performed two running tasks: an interval run of 5 x 300 m at sub-maximum speed with a one-min rest (100 m jogging) between individual runs, and a continuous 6-km run at the anaerobic threshold speed (criterion VOBLA). To measure the contractile characteristics of the femuris muscle quadriceps before and after a running load the following electrical stimulation (ES) tests were used: single twitch, low - and high-frequency stimulation, the maximum voluntary knee extension test and the muscle activation level test. The anaerobic interval runs caused a greater decline in maximum torque twitch (p<0.05) and a greater decline in maximum muscular relaxation rate (p<0.05) compared to the longer continuous run. The anaerobic interval load reduced muscle contraction at both low and high frequencies of ES, while the aerobic continuous run led to a lowering of muscle contraction force but only at low frequencies of stimulation. After both charges the decrease in ES-evoked muscle contraction was bigger than the decrease in torque at MVC. Both running loads caused peripheral fatigue. The lowering of muscular contractile ability after both loads was mainly the consequence of disturbance in the Ca transport system mechanism, while after the intensive interval runs this was also a result of disturbance in the spreading action potential across the sarcomere.
Authors and Affiliations
B Škof, V Strojnik
Keywords
Related Articles
- EP ID EP58948
- DOI -
- Views 119
- Downloads 0
GENE DOPING IN SPORT – PERSPECTIVES AND RISKS
In the past few years considerable progress regarding the knowledge of the human genome map has been achieved. As a result, attempts to use gene therapy in patients’ management are more and more often undertaken. The aim...
Can high intensity workloads be simulated at moderate intensities by reduced breathing frequency?
Objectives: This study was designed to investigate whether reduced breathing frequency during moderate intensity exercise produces similar metabolic responses as during exercise with spontaneous breathing at higher absol...
ENDURANCE EXERCISE TRAINING AND DIFERULOYL METHANE SUPPLEMENT: CHANGES IN NEUROTROPHIC FACTOR AND OXIDATIVE STRESS INDUCED BY LEAD IN RAT BRAIN
For many years it has been known that lead is life-threatening, not only as an air pollutant but also because of it has been associated with several conditions including degenerative disease of the nervous system. In the...
Sprint, agility, strength and endurance capacity in wheelchair basketball players
The aims of the present study were, firstly, to determine the reliability and reproducibility of an agility T-test and Yo-Yo 10 m recovery test; and secondly, to analyse the physical characteristics measured by sprint, a...
URINARY CREATINE AT REST AND AFTER REPEATED SPRINTS IN ATHLETES: A PILOT STUDY
Creatine plays a key role in muscle function and its evaluation is important in athletes. In this study, urinary creatine concentration was measured in order to highlight its possible significance in monitoring sprinters...