2 edition of Alterations in human skeletal muscle properties through isokinetic cycle ergometry. found in the catalog.
Alterations in human skeletal muscle properties through isokinetic cycle ergometry.
Charles E. Meacci
by Microform Publications, College of Human Development and Performance, University of Oregon in Eugene
Written in English
Thesis (Ed.D.) - West Virginia University, 1982.
|The Physical Object|
|Pagination||2 microfiche (142 fr) :|
|Number of Pages||142|
Lactate and hydrogen ion gradients from arterial to muscle and femoral venous to muscle during cycle ergometry at 75%V˙ o 2 max only after either CON or ALK. Measure Trial 75%V˙ o 2 max; Arterial to muscle Femoral venous to muscle ; Lactate gradient: CON: ± ± ALK: ± ± H + gradient: CON. Evaluation of the adolescent’s skeletal muscle is important to understand body movement, especially including those involved in sports. Strength, power and endurance capacity are defined as parameters of skeletal muscle biomechanical properties. The isokinetic dynamometer is an important toll for making this type of evaluation.
Muscle fiber generates tension through the action of actin and myosin cross-bridge cycling. While under tension, the muscle may lengthen, shorten, or remain the same. Although the term contraction implies shortening, when referring to the muscular system, it means muscle fibers generating tension with the help of motor neurons. 1. Introduction. Electromyography (EMG) involves recording and quantifying the action potentials of skeletal muscle fibers. The signal detected by electrodes placed on the skin surface over a muscle is generated by a summation of the action potential trains from the active motor units and is influenced not only by the activation signal from the central nervous system, but also by the.
Exercise is used as the primary countermeasure to minimize or eliminate skeletal muscle atrophy and bone calcium loss and to prevent physical deconditioning during spaceflight. There are usually two daily exercise sessions performed on a 3-d-on/3-d-off schedule during Russian spaceflights longer than 3 months. Based on exercise heart rates and oxygen uptakes, each exercise session is. Sarcopenia. Senile sarcopenia, the loss of muscle mass associated with aging, is a main cause of muscle weakness in old age. This process has an onset at around the 6th decade, and by the 8th decade muscle mass attains a value approximating to 60% that of the 2nd decade (Lexell et al. ).The aetiology of sarcopenia is rather complex and involves multiple factors (), but there is .
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Get this from a library. Alterations in human skeletal muscle properties through isokinetic cycle ergometry. [Charles E Meacci]. Also in an in vivo study using cycle ergometry, If alterations to neuromuscular properties are not Ramos, J.S.
et al. Alterations to neuromuscular properties of skeletal muscle are Author: Trishan Gajanand, Trishan Gajanand, Sonia Conde Alonso, Joyce S. Ramos, Jean Philippe Antonietti, Fa. There is a paucity of data related to understanding the training consequences of functional electric stimulation cycle ergometry (FES-CE) on the maintenance of skeletal muscle form, structure, and function after acute spinal cord injury (SCI).Cited by: Subjects.
The present study used previously collected muscle samples from two larger studies. In study 1, 24 healthy males volunteered to participate (age: RES, ± yr; END, ± yr).Subjects were assigned to an acute exercise protocol based on their training history, either high-intensity eccentric contractions (RES; n = 12) or high-intensity cycle ergometry to exhaustion Cited by: The metabolic properties of skeletal muscle are highly adaptive More direct evidence of structural alterations of skeletal muscle in patients with COPD comes from studies at the cellular level.
(, ) and the fact that vitamin E protects human skeletal muscle from damage during surgical ischemia-reperfusion support this theory. human. skeletal. muscle. contractile. properties. vivo (Lopes. al, The subgroup analysis for the effects of caffeine on isokinetic strength of other, smaller muscle groups indicated no.
FM (n = 8) and HC (n = 8) underwent a cycle ergometry test of aerobic capacity, a muscle biopsy for determination of nitric oxide synthase (eNOS, nNOS, iNOS) content, and microdialysis for. The purpose of this study was to compare the effects of warm-up protocols using either whole-body vibration (WBV) or cycle ergometry (CE) on peak torque at 3 different isokinetic speeds and on.
A euglycemic–hyperinsulinemic clamp procedures revealed that glucose uptake was impaired by downhill running but not CON muscle actions from cycle ergometry (which disappeared by 48 h) suggesting that the eccentric-contraction-induced muscle damage was the cause of reduced insulin sensitivity, but there was no relationship with cortisol.
Ramos, Jean-Philippe Antonietti, Fabio Borrani, Alterations to neuromuscular properties of skeletal muscle are temporally dissociated from the oxygen uptake slow component, Scientific Reports, /s, 10, 1, ().
These studies found: (1) 20 weeks of cycle ergometer training (4 days/week, 1 hour/day at 75–90% VO 2 max) increased PFK activity ~% in human vastus lateralis muscle (2) 6 weeks of treadmill running (5 days/week, 6 bouts of min at 40 m/min) increased PFK activity 20–25% in rat soleus and deep vastus lateralis muscle, but not in the.
Alterations this early in the process (cell signalling) could contribute to the age-related changes in skeletal muscle at rest and after one or more bouts of exercise. Conclusions This investigation is the first to provide evidence that MAPK signalling pathways are differentially activated under resting and exercise conditions in skeletal.
skeletal muscle sarcopenia (i.e., reduced muscle mass and strength) after a period of sustained unloading is preferential to weight-bearing muscles. Both spaceflight and bed-rest unloading (BRU) lead to atrophy in slow and fast muscle fibers (12, 18) and marked loss of strength (9, 36).In rodents, sarcopenia is accompanied by an increased distribution of fast myosin heavy chain (MHC) isoforms.
On the contrary, the highest rate of human skeletal muscle ATP turnover from the individual metabolic pathways has been reported to be ∼9 mmolkg −1 s −1 (dm) for both PCr utilization during electrical stimulation and glycolysis during s isokinetic cycling at rpm. On this basis, there is clear capacity for ATP turnover to increase.
Effect of short-term unweighting on human skeletal muscle strength and size. Aviat Space Environ Med –, PubMed Google Scholar; 2 Alkner BA, Tesch PA. Knee extensor and plantar flexor muscle size and function following 90 days of bed rest with or without resistance exercise.
Eur J Appl Physiol –, Most creatine is stored in skeletal muscle (~95%), ~70% of which is found inside the cell as phoshocreatine (PCr) 50% is done through nutritional intake, remainder synthesized endogenously.
creatine dose. % of human adult BW 62% is skeletal muscle. Adequate proteins are necessary to. The first visit was an orientation session, during which, the subjects were allowed to practice a series of 25 consecutive maximal, concentric isokinetic muscle actions of the dominant forearm flexors at a velocity of ° s −1 (through a range of motion from approximately ° to 90° of forearm flexion) on a calibrated Cybex II isokinetic.
The changes induced by spaceflight and a variety of ground-based unloading models can involve skeletal muscles in general, appear specific for fast or slow muscle, or selectively target fast or slow muscle fiber types (1, ). Determining whether particular structural and functional properties are regulated at a general, muscle type- or.
The paralyzed vastus lateralis muscle showed significant alterations in skeletal muscle characteristics after the training, indicated by an improvement in total work output (52– kJ; P. Previous research examining EMG and MMG during cycle ergometry concluded that some of the MMG amplitude may be occurring from incomplete muscle relaxation and passive muscle fibre movement (Shinohara et al., ), which may explain some of the discrepancies in our study between EMG and MMG signal power during varying phases of the gait cycle.In the subsequent sections, human spaceflight and ground-based analog studies and experimental animal studies are reviewed that contribute to the evidence base on the alterations in skeletal muscle form and function that occur with the muscle unloading associated with the microgravity environment.The concentric muscle actions were performed at 60°s −1 through a 90° range of motion (from ° to 80°), and the isometric muscle actions were performed for 4 s at an elbow joint angle of ° where ° corresponded to full extension [57,58,59,60].
The highest values were selected as the pretest concentric PT and isometric PT.