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Results 301 - 350 of 914
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Drury Daniel G - - 2006
The purpose of this investigation was to determine the influence of contraction velocity on the eccentric (ECC) and concentric (CON) torque production of the biceps brachii. After performing warm-up procedures, each male subject (n = 11) completed 3 sets of 5 maximal bilateral CON and ECC isokinetic contractions of the ...
Gerber J Parry - - 2006
STUDY DESIGN: Case report. OBJECTIVES: To present a progressively increasing negative-work exercise program via eccentric ergometry early after anterior cruciate ligament reconstruction (ACL-R) and to suggest the potential of negative work to amplify the return of quadriceps size and strength. CASE DESCRIPTION: The patient was a 26-year-old highly active recreational ...
Bird Michael - - 2006
The purpose of this study was to compare the Ab-Slide with crunch abdominal exercises for electromyographic activity for selected muscles. Forty-five subjects who regularly performed abdominal exercises participated. Subjects completed 5 trials for each exercise, with repetition rate controlled by the tester. Electromyographic activity for the external oblique (EO), upper ...
Chen T C - - 2006
This study compared changes in indirect markers of muscle damage following eccentric exercise of the elbow flexors among the exercises consisting of different number of eccentric actions. Sixty male athletes were placed into one of the six groups (n=10 per group) based on the number of eccentric actions for the ...
Clarkson Priscilla M - - 2006
PURPOSE: Serum creatine kinase (CK) levels are commonly used to judge the severity of muscle damage and to determine when to hospitalize patients who present with symptoms of exertional rhabdomyolysis in order to prevent renal failure. However, no CK standard exists because of the limited information available regarding exercise-induced CK ...
Ferri Alessandra - - 2006
Ageing is associated with an increased susceptibility to muscle damage but little is known on how this affects muscle recovery after exercise. Hence, this study is aiming at investigating the effects of a heavy-resistance training session of neuromuscular recovery of the calf muscles of a group of elderly men aged ...
Jonhagen S - - 2006
OBJECTIVES: To detect neuropeptides in human skeletal muscle at rest and after eccentric exercise. METHOD: Eight healthy subjects participated in the study. Microdialysis of the distal part of the vastus lateralis of the quadriceps muscle and pain evaluation were performed immediately after eccentric exercise, after two days, and at rest. ...
Mattos Gustavo M - - 2006
OBJECTIVES: Solid caustic soda (CS) ingestion levels continue high in Brazil. The aggressiveness of a caustic agent depends, among other factors, on its concentration and time of contact with mucosa. However, the interdependence of these factors in the production of caustic lesion in the esophageal mucosa is not known, especially ...
Molnar A M - - 2006
Oxidative stress with acute/chronic exercise has been so far examined using exercise involving a combination of concentric and eccentric contractions, but skeletal muscles are likely to be injured to a greater extent by pliometric contractions. In the present study, the effects of acute and chronic bouts of downhill running exercise ...
LaRoche Dain P - - 2006
BACKGROUND: Stretching is used in an attempt to improve performance and reduce the risk of muscle injury, with little evidence to support its effectiveness. HYPOTHESIS: Four weeks of static or ballistic stretching can attenuate the increased soreness and decreased flexibility seen after eccentric exercise. STUDY DESIGN: Controlled laboratory study. METHODS: ...
Dreyer Hans C - - 2006
We tested the hypothesis that the expansion of satellite cell numbers, 24 h after maximal eccentric knee extensor exercise, is blunted in older men. Muscle biopsies were obtained from the vastus lateralis of 10 young (23-35 years) and 9 older (60-75 years) men. Satellite cells were identified immunohistochemically using an ...
Beck Travis W - - 2006
The purpose of this investigation was to determine the mechanomyography (MMG) and electromyography (EMG) amplitude and mean power frequency (MPF) vs. eccentric isokinetic torque relationships for the biceps brachii muscle. Nine adults (mean +/- SD age = 23.1 +/- 2.9 years) performed submaximal to maximal eccentric isokinetic muscle actions of ...
Chen Trevor C - - 2006
This study investigated whether the second eccentric exercise performed 3 days after the initial bout would exacerbate muscle damage and retard the recovery. Fifty-one athletes performed 30 eccentric actions of the elbow flexors using a dumbbell weighted 100% of the maximal isometric force (MIF) at the elbow joint angle of ...
Cañete Silvia - - 2006
The purpose of this study was to determine the effects of short-term (7 days) oral creatine supplementation (0.3 g.kg(-1)) in elderly women during exercise tests that reflect functional capacity during daily living tasks. We assessed several indices of endurance capacity (1-mile walk test, gross mechanical efficiency, ventilatory threshold, and peak ...
Miyama, Motoyoshi
MIYAMA, M. and NOSAKA, K., Muscle Damage and Soreness Following Repeated Bouts of Consecutive Drop Jumps. Abv. Exerc. Sports Physiol., Vol.10, No.3 pp.63-69, 2004. This study investigated the magnitude of muscle damage and soreness induced by consecutive drop jumps (DJ), and whether changes in indicators of muscle damage attenuate when ...
Yamashita-Goto, Katsumasa
YAMASHITA GOTO, K. and YOSHIOKA, T., Relationship Between Exercise-Induced Creatine Kinase Release and Its Activity in Muscles. Adv. Exerc. Sports Physiol., Vol.1, No.1 pp19-24, 1994. We examined the relationship between eazymaticalty ...
Kosaka, Kazunori
NOSAKA, K., SAKAMOTO, K. and NEWTON, M., Influence of Armcranking on Changes in Plasma CK Activlty after High Force Eccentric Exerclse of the Elbow Flexours. Abv. Exerc. Sports Physiol., Vol.8, No.2 pp.45-50, 2002. It was hypothesized that the time course of changes in plasma creatine kinase(CK) activity following eccentrie exercise ...
Nosaka, Kazunori
NOSAKA, K. and SAKAMOTO, K., Changes in Leukocytes after Eccentric Exercise of the Elbow Flexors. Adv. Exerc. Sports Physiol., Vol.6, No.2 pp59-65, 2000. This study investigated the relationship between changes in circulating numbers of leukocytes and muscle damage after 24 maximal eccentric actions of the elbow flexors. Blood samples and ...
Uchiyama Shuichi - - 2006
We examined whether oxidative stress-induced muscle damage occurs during weight-lifting exercise using the rat model. Male Wistar rats were subjected to a single exhaustive session of weight-lifting exercise, and dynamics of blood volume and hemoglobin levels in the exercising muscle were monitored by near-infrared spectroscopy. Total muscle damage was evaluated ...
Piroddi N - - 2006
Creatine phosphate (CP) and creatine kinase (CK) are involved in the rapid resynthesis of ATP and thereby serve to stabilize ATP concentration and to maintain free ADP low inside cardiac muscle cells during contraction. Recently, it has been suggested from experiments in permeabilized multicellular preparations that CP/CK also regulate the ...
NEWTON, Michael
Despite the substantial body of research accumulated on exercise-induced muscle&#10;damage, there remain several areas that warrant further investigation. Study groups&#10;comprised of individuals from differing racial background and /or training status have&#10;the potential to influence the intra-group variability in damage markers following&#10;eccentric exercise. In addition, if a contralateral arm model is ...
Cleary Michelle A - - 2006
CONTEXT: A dehydrated individual who performs eccentric exercise may exacerbate skeletal muscle damage, leading to structural, contractile, and enzymatic protein denaturation, in addition to the myofiber and connective damage resulting from the eccentric muscle tension. OBJECTIVE: To identify the effects of dehydration on 5 physiologic characteristics of delayed-onset muscle soreness ...
Matsuse Hiroo - - 2006
"Hybrid" exercise uses forces generated by an electrically stimulated muscle to resist the motion of a volitionally contracting agonist. This approach is effective in increasing muscle bulk and strength. Its safety, however, has not been studied and the purpose of this study was to address this lack by assessing the ...
Milias G A - - 2006
Inflammation and oxidative stress have been implicated in the mechanism of eccentric exercise-induced muscle injury. This study examined whether baseline serum levels of selenium (Se), a trace element that participates in both antioxidant and anti-inflammatory systems, affects the overall response to injury. Thirteen males performed 36 maximal eccentric actions with ...
Thompson Heather S - - 2006
BACKGROUND/AIMS: The clinical complications associated with an unopposed estrogen environment and luteal phase defects observed in exercising women prompted the examination of the relationship of exercise and endogenous ovarian steroids with serum creatine kinase (CK) activity. METHODS: Subjects (n = 34) were classified into three groups according to their exercise ...
Prasartwuth O - - 2006
To assess the contribution of central and peripheral factors to changes in maximum voluntary force and its length dependence after eccentric muscle damage, voluntary and twitch torque were measured across a wide angular range, along with voluntary activation using twitch interpolation. Isometric torque from both maximum voluntary contractions (MVCs) and ...
Howatson G - - 2005
The purpose of this investigation was to, firstly, examine the effects of repeated applications of ice massage on the indirect markers associated with muscle damage using a within-subjects cross-over design and secondly, to examine how ice massage affects muscle function in both static and dynamic contractions following unaccustomed eccentric exercise. ...
Braun W A - - 2005
AIM: Delayed onset of muscle soreness (DOMS) often results from unaccustomed exercise or exercise that involves heavy eccentric loading of skeletal muscle. Chondroitin sulfate (CS) has been reported to possess anti-inflammatory and analgesic properties and has been used widely in the treatment of osteoarthritis. Based on these findings, the investigators ...
Okudan N - - 2005
AIM: The aim of this study was to investigate the effects of creatine supplementation on performance during the repeated bouts of supramaximal exercise. METHODS: Twenty-three untrained young males participated in the study. A double blind design was used to create the creatine and placebo groups. Wingate test was performed 5 ...
Stasinopoulos D - - 2005
Home exercise programmes and exercise programmes carried out in a clinical setting are commonly advocated for the treatment of lateral elbow tendinopathy (LET), a very common lesion of the arm with a well-defined clinical presentation. The aim of this study is to describe the use and effects of strengthening and ...
Gjøvaag Terje F - - 2006
Increased HSP expression in response to acute exercise is well documented in animal studies, and there is growing evidence that similar responses occur in man. In general, many human exercise studies have investigated the HSP response to low force continuous activity, while the knowledge about the HSP response to high ...
Paulsen Gøran - - 2005
PURPOSE: Delayed leukocytosis after strenuous exercise is well documented, but the underlying mechanisms are not clear. In this study, we investigated the relationship between exercise-induced muscle damage and delayed leukocytosis, by utilizing an extreme eccentric exercise protocol. METHODS: We obtained blood samples from 11 healthy men before and after 300 ...
Pettitt Robert W - - 2005
The repeated bout effect (RBE) is a phenomenon characterized by less delayed onset muscle soreness (DOMS) and torque deficit after the second of 2 separate eccentric exercise bouts. Previous investigators have reported that shifting of optimum angle after an initial bout of eccentric exercise mediates the RBE. We hypothesized that ...
Lin Hsingwen - - 2006
BACKGROUND: An episode of rhabdomyolysis occurred after an endurance test in high school students in Taipei County in November 2003. PURPOSE: To determine the incidence, outcome, and risk factors in an episode of exertional rhabdomyolysis in high school students. STUDY DESIGN: Descriptive epidemiology study. METHODS: We enrolled all 225 high ...
Lavender Andrew P - - 2006
This study tested the hypothesis that eccentric exercise (ECC) would increase force fluctuation for several days following exercise; however, concentric exercise (CON) would not produce such an effect. Twelve men performed six sets of five reps of dumbbell exercise of the elbow flexors eccentrically with one arm and concentrically with ...
Nosaka Kazunori - - 2005
A single bout of eccentric exercise confers a long-lasting protective effect against subsequent bouts of the same exercise. This study investigated how the protective effect was lessened when the interval between the initial and secondary exercise bouts was increased from 4 to 12 weeks. Thirty young men performed two bouts ...
Milias George A - - 2005
It has been reported that exercise with eccentric contractions can induce damage and inflammation in human muscle tissue, the severity of which depends on the duration and the intensity of exercise. Platelet activating factor (PAF) is a potent inflammatory mediator implicated in a series of pathophysiological conditions. We sought to ...
Nottle C - - 2005
While various models for exercise-induced muscle damage (EIMD) have been introduced, many of them use maximal voluntary contractions of the elbow flexors and knee extensors performed on isokinetic dynamometers. Few studies have used exercise protocols that attempt to replicate submaximal eccentric muscle actions that commonly occur during daily activities. Downhill ...
Butterfield Timothy A - - 2005
Eccentric exercise has been shown to have a measurable effect on the force-length relationship (FLR), as peak force is shifted to longer muscle lengths following exercise. Recently, this shift in the FLR has been proposed as a "simple, reliable indicator" for assessing contractile element damage following eccentric exercise. However, eccentric ...
Väänänen I I II LIKES-Research Center, Jyväskylä, - - 2005
Physical exercise can have beneficial as well as detrimental effects on body tissues. The purpose of this study was to examine how the body responds to a 2-day 100 km ski event. Two-day follow-up, field trial to measure changes in body mass, postural response of heart rate, pain perception, range ...
Rahnama N - - 2005
Delayed-onset muscle soreness refers to the skeletal muscle pain that is experienced following eccentric exercise. The aim of the present study was to examine the physiological effects of physical activity with or without ibuprofen on delayed onset muscle soreness. Forty-four non-athletic male volunteers (age 24.3 +/- 2.4 years) were randomly ...
van Someren Ken A - - 2005
This study examined the effects of beta-hydroxyl-beta-methylbutyrate (HMB) and alpha-ketoisocaproic acid (KIC) supplementation on signs and symptoms of exercise-induced muscle damage following a single bout of eccentrically biased resistance exercise. Six non-resistance trained male subjects performed an exercise protocol designed to induce muscle damage on two separate occasions, performed on ...
Bloomer Richard J - - 2005
This investigation was designed to determine the effects of astaxanthin on markers of skeletal muscle injury. Twenty resistance trained men (mean +/- standard error of the mean : age , 25.1 +/- 1.6 y; height, 1.79 +/- 0.02 m; weight, 86.8 +/- 4.4 kg) were assigned to either a placebo ...
Jamurtas Athanasios Z - - 2005
Many exercise models have demonstrated associations between eccentric muscle actions and muscle damage. However, the magnitude of muscle damage varies among the models. It appears that responses to eccentric exercise are different between leg and arm muscles but this has not been systematically clarified. This study compared leg and arm ...
Hart Joseph M - - 2005
Sport massage is often used to help prepare for exercise, expedite recovery from muscle soreness, and enhance athletic performance. However, the effect of sport massage on recovery from delayed-onset muscle soreness is unknown. To determine the effect of a short sport massage treatment on intramuscular swelling and pain in response ...
Zainuddin Zainal - - 2005
Short-term strict immobilization of the arm using a cast enhances recovery of muscle function after eccentric exercise. To determine if placing one arm in a sling ("light" immobilization) for 4 days after eccentric exercise of the elbow flexor muscles would reduce muscle soreness and enhance recovery compared with the exercised ...
Hoffman Jay R - - 2005
PURPOSE: Changes in biochemical indices of muscle damage and hormonal markers of stress were examined during a competitive intercollegiate football season. METHODS: Twenty-one members of an NCAA Division III football team volunteered to serve as subjects. Eleven of these subjects were starters (ST) and 10 were non-starters (NS). All subjects ...
Moysi Joaquin Sanchis - - 2005
The aim of this study was to find out whether the efficiency of concentric muscle contraction is impaired by eccentric squatting exercise. The study involved 25 male physical education students in two experiments. In the first experiment 14 subjects undertook cycling exercise at 65% VO(2)max until exhaustion on two occasions. ...
Reisman Simone - - 2005
PURPOSE: A commonly used method for warm-up before exercise is to stretch muscles. How this benefits performance remains uncertain. After a period of eccentric exercise, there is muscle damage accompanied by an increase in passive tension, perceived as a sensation of increased stiffness in the exercised muscles. We have tested ...
Hilberg Thomas - - 2005
Eccentric exercise can cause skeletal muscle damage with ultrastructural disruption, inflammation and increased proteolytic enzyme activity. It may be possible that these changes are able to trigger blood coagulation in vivo. The aim of the study was to investigate changes in blood coagulation via the measurement of aPTT, the thrombin ...
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