Abstract:
:Food restriction has a great impact on skeletal muscle mass by inducing muscle protein breakdown to provide substrates for energy production through gluconeogenesis. Genetic models of hyper-muscularity interfere with the normal balance between protein synthesis and breakdown which eventually results in extreme muscle growth. Mutations or deletions in the myostatin gene result in extreme muscle mass. Here we evaluated the impact of food restriction for a period of 5 weeks on skeletal muscle size (i. e., fibre cross-sectional area), fibre type composition and contractile properties (i. e., tetanic and specific force) in myostatin null mice. We found that this hyper-muscular model was more susceptible to catabolic processes than wild type mice. The mechanism of skeletal muscle mass loss was examined and our data shows that the myostatin null mice placed on a low calorie diet maintained the activity of molecules involved in protein synthesis and did not up-regulate the expression of genes pivotal in ubiquitin-mediated protein degradation. However, we did find an increase in the expression of genes associated with autophagy. Surprisingly, the reduction on muscle size was followed by improved tetanic and specific force in the null mice compared to wild type mice. These data provide evidence that food restriction may revert the hyper-muscular phenotype of the myostatin null mouse restoring muscle function.
journal_name
Int J Sports Medjournal_title
International journal of sports medicineauthors
Matsakas A,Romanello V,Sartori R,Masiero E,Macharia R,Otto A,Elashry M,Sandri M,Patel Kdoi
10.1055/s-0032-1312605subject
Has Abstractpub_date
2013-03-01 00:00:00pages
223-31issue
3eissn
0172-4622issn
1439-3964journal_volume
34pub_type
杂志文章abstract::This study compared physiological responses associated with exercise tolerance in girls (G) and women (W) of similar fitness and heat acclimatization level during exercise in a hot and humid outdoor environment (33.4 degrees C and 55.1 % RH; WBGT = 29.9 +/- 0.2 degrees C). Nine pre-menarcheal G (age = 11.3 yr) and nin...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2006-923863
更新日期:2006-12-01 00:00:00
abstract::The development of intermittent endurance capacity, its underlying mechanisms and role in reaching professional level in soccer was investigated. The sample included 130 talented youth soccer players aged 14-18, who became professional (n = 53) or non-professional (n = 77) players in adulthood. In total 229 Interval S...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-0029-1243254
更新日期:2010-03-01 00:00:00
abstract::There is a potential need for the official criterion of testosterone abuse in sport (the urinary concentration ratio of testosterone glucuronide/epitestosterone glucuronide, TG/EG > 6) to be backed-up by some complementary markers, more particularly in cases of physiologically high TG/EG and when there is suspicion of...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2007-972853
更新日期:1996-07-01 00:00:00
abstract::Since doping improves athletic performance, anti-doping policies should have the opposite effect. This analysis examined whether changes in the speed of major cycling races reflect recent anti-doping efforts. Average speeds of 5 (th) place finishers of the Tour de France, Giro d'Italia, and Vuelta a España cycling rac...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-0030-1247593
更新日期:2010-04-01 00:00:00
abstract::Aerobic exercise performance decreases upon ascent to altitude whereas anaerobic performance remains unchanged. Although the effects of 1 - 3 wk of altitude acclimatization on both aerobic and anaerobic exercise performance have been well studied, the effects of short-term altitude acclimatization (i.e., 45 h) on thes...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2005-872823
更新日期:2006-08-01 00:00:00
abstract::Muscle contusions represent a major part of sports injuries. The suggested treatments are generally sufficient to support muscle healing, but require a relatively long period of time. Given that autologous blood products are safe treatments, we have used a technique which stimulates the release of certain growth facto...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2004-821303
更新日期:2004-11-01 00:00:00
abstract::As of 2017, the international football federation introduced the change of direction ability test (CODA) and the 5×30 m sprint test for assistant referees (ARs) and continued the 6×40 m sprint test for field referees (FRs) as mandatory tests. The aim of this study was to evaluate the association between performance in...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/a-0577-4073
更新日期:2018-07-01 00:00:00
abstract::The use of 60%-95% of maximal heart rate (HR), heart rate reserve (HRR) and VO2max as exercise training intensities was examined in male runners, and these intensities were related to VO2 observed at the lactate threshold (LT) and fixed blood lactate concentrations (FBLC) of 2.0, 2.5, and 4.0 mM. Thirty-one subjects (...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2007-1024795
更新日期:1990-06-01 00:00:00
abstract::The aim of this study was to determine whether the amplitude of the V˙O (2) slow component was dependent from Critical Power (CP; the slope of the linear time - distance relationship) in individuals matched for V˙O (2) peak. 30 moderately-trained endurance athletes completed a maximal graded exercise test, 2 randomly ...
journal_title:International journal of sports medicine
pub_type: 杂志文章,随机对照试验
doi:10.1055/s-0031-1275358
更新日期:2011-09-01 00:00:00
abstract::The purpose of this study was to determine if an eight-week intrahospital supervised, conditioning program improves functional capacity and quality of life (QOL) in children (4 boys, 4 girls) (mean [SD] age: 10.9 [2.8] years [range: 8-16]) who have undergone bone marrow transplantation (BMT) for leukemia treatment wit...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2007-965571
更新日期:2008-05-01 00:00:00
abstract::The effect of clinically used doses of propranolol, atenolol, nifedipine, propranolol plus nifedipine, and atenolol plus nifedipine on thermoregulatory responses of 11 healthy men was studied during 2-h block-stepping in heat. Drug intervention did not alter ventilation during exercise. In contrast, propranolol and at...
journal_title:International journal of sports medicine
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1055/s-2008-1025631
更新日期:1987-02-01 00:00:00
abstract::The present study evaluated the accuracy of predicting velocity and oxygen consumption (VO2) at the LT lactate threshold and FBLC fixed blood lactate concentrations from a 3200-m time trial in women. Forty-four women (mean age = 31.1 yrs, mean ht = 164.9 cm, mean wt = 65.0 kg) completed a treadmill protocol for the de...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2007-1024821
更新日期:1990-10-01 00:00:00
abstract::Prolonged altitude exposure usually leads to considerable weight loss of which a large part is from muscle tissue. This loss reduces maximum alactic anaerobic muscle power. It was hypothesized that most of the weight loss may simply be the result of malnutrition due to lack of palatable food in an uncomfortable enviro...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2007-1021171
更新日期:1993-07-01 00:00:00
abstract::Using the indentation method, we investigated the effects of physical exercise (treadmill running 4 km/day for 15 weeks) on stiffness of the articular cartilage in the canine knee. Considering cartilage to be an elastic material with homogeneity and isotropy, we calculated elastic moduli for femoral, tibial, and patel...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2008-1025743
更新日期:1986-04-01 00:00:00
abstract::Wheelchair users undergo changes in body composition as a result of disability. In this study the distribution of bone mineral, lean and fat mass was assessed in highly-trained female wheelchair athletes and a reference group by dual-energy X-ray absorptiometry (DXA). The transferability of anthropometric equations co...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-0028-1105941
更新日期:2009-04-01 00:00:00
abstract::This study examined the relationship between PhA and short-term maximal intensity efforts in soccer players, and was conducted in 99 male soccer players, ages 19-36 years. Bioelectrical impedance was used to assess body fat, fat free mass (FFM) and PhA (phase angle). Running Anaerobic Sprint Test (RAST) was used to ev...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/a-0969-2003
更新日期:2019-10-01 00:00:00
abstract::We investigated how inspiratory muscle training impacted respiratory and locomotor muscle deoxygenation during submaximal exercise with resistive inspiratory loading. 16 male cyclists completed 6 weeks of either true (n=8) or sham (n=8) inspiratory muscle training. Pre- and post-training, subjects completed 3, 6-min e...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-0042-104198
更新日期:2016-07-01 00:00:00
abstract::This study aims to investigate the relationship between subjective and external measures of load in professional youth football players whilst accounting for the effect of training theme or competition. Data from ratings of perceived exertion and global positioning system-derived measures of external training load wer...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/a-1300-2959
更新日期:2020-12-01 00:00:00
abstract::The aim of this study was to investigate the effect of short-term, moderate intensity and low volume endurance training on gonadal hormone profile in untrained men. Fifteen young, healthy men performed an endurance training of 5-week duration on a cycle ergometer. Before and after the exercise program all participants...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-0029-1202340
更新日期:2009-07-01 00:00:00
abstract::The purpose of this randomized controlled trial was to determine the effects of an 8-week (aerobic+strength) exercise training program (3 sessions/week) on the circulating cytokine levels of breast cancer survivors. We randomly allocated 16 female survivors of breast cancer (mean±SD age: 50±5 years) to an intervention...
journal_title:International journal of sports medicine
pub_type: 杂志文章,随机对照试验
doi:10.1055/s-0031-1271697
更新日期:2011-06-01 00:00:00
abstract:UNLABELLED:Caffeine has many diverse physiological effects including central nervous system stimulation. Ventilatory threshold and a recently described heart rate variability threshold both have a relationship with autonomic control that could be altered by caffeine consumption. The purpose of this investigation was to...
journal_title:International journal of sports medicine
pub_type: 杂志文章,随机对照试验
doi:10.1055/s-0032-1301904
更新日期:2012-07-01 00:00:00
abstract::The purpose of this study was to establish the content validity of the Rodeo SCAT for the sport of rodeo and bull riding. The study design was comprised of expert consensus and content validation. A modified Ebel procedure was employed to content validate the rodeo SCAT. Content validation using this method includes e...
journal_title:International journal of sports medicine
pub_type: 共识发展会议,杂志文章
doi:10.1055/s-0032-1311651
更新日期:2013-02-01 00:00:00
abstract::The goal of this study was to examine the hypothesis that the difference in the 200-m sprint performance of amputee and able-bodied sprinters is due to a shorter step length rather than a lower step frequency. Men's elite-level 200-m races with a total of 16 able-bodied, 13 unilateral transtibial, 5 bilateral transtib...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-0035-1564171
更新日期:2016-02-01 00:00:00
abstract::To determine the effects of widely varying amounts of cushioning upon vertical force (VF) parameters, ten male subjects, (mean weight = 68.0 kg) ran at a speed of 4.5 m . s-1 (6 min/mile pace) and contacted a Kistler force platform. Two shoes were tested: a hard one and a softer shoe that had 50% more cushioning as me...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2008-1026043
更新日期:1983-11-01 00:00:00
abstract::Male (n = 9) and female (n = 8) collegiate cross-country runners were studied during a training session to determine the amount of iron lost in the sweat. Sweat samples were collected from the arm using polyethylene bags. Total sweat loss was determined by weighing subjects before and after the runs. Average time of s...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2007-1024978
更新日期:1988-02-01 00:00:00
abstract::The objective of the study is to describe two cases of proximal tibiofibular ganglion cysts in high level athletes. In May 2003 and March 2005 two athletes (one tennis player in the top eighty of the Italian national ranking and a gymnast belonging to the Italian rhythmic gymnastics national team) were referred to our...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2007-989440
更新日期:2008-08-01 00:00:00
abstract::Circulatory leukocytes vary significantly in response to acute bouts of exercise. However, little is known concerning the adaptability of this response to chronic intense exercise training. We investigated the circulating leukocytic response to acute exercise in trained athletes during a 28-day intense exercise traini...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2007-1021252
更新日期:1992-02-01 00:00:00
abstract::Consumption of a high-fat meal (HFM) causes postprandial lipemia and vascular dysfunction. Acute resistance exercise (RE) alone may also have a negative effect on vascular function. The purpose of this study was to measure arterial stiffness and postprandial lipemia after a HFM with or without acute RE. 9 recreational...
journal_title:International journal of sports medicine
pub_type: 杂志文章,随机对照试验
doi:10.1055/s-0033-1363266
更新日期:2014-10-01 00:00:00
abstract::The broad spectrum of skills in sport, with their high demands on strength, speed, endurance, coordination, and flexibility, represents one of the greatest challenges to human motor performances. However, the basic neurophysiological mechanisms in sport are not principally different from those in everyday motor acts. ...
journal_title:International journal of sports medicine
pub_type: 杂志文章,评审
doi:10.1055/s-2008-1025805
更新日期:1985-02-01 00:00:00
abstract::Patellofemoral joint (PFJ) pain syndrome is a commonly reported form of pain in female runners and military personnel. Increased PFJ stress may be a contributing factor. Few studies have examined PFJ stress running with added load. Our purpose was to analyze PFJ stress, PFJ reaction force, quadriceps force, knee flexi...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/a-1088-5467
更新日期:2020-06-01 00:00:00