Abstract：
:The effects of muscle temperature on the development of muscular power are discussed. Temperature influences power (both metabolic and mechanical) by means of its effects on the rate of ATP hydrolysis and/or resynthesis. One would therefore expect reduced power outputs at cold muscle temperatures in humans. However, this is not the case during submaximal aerobic exercise. In fact, no changes in metabolic power output at any given submaximal work load were found at cold muscle temperatures, despite the reduced rate of ATP resynthesis and/or splitting. To explain this, it has been postulated that the fraction of active muscle mass at any given time instant could increase in the cold, thus compensating for the reduced ATP splitting rate. This means that the aerobic ATP resynthesis in the cold may be carried out at a slower rate by a greater activated muscle mass. This compensation cannot be operational when maximal power is attained, for in this case the instantaneously activated muscle mass is constant and limited. In fact the maximal aerobic power and the maximal instantaneous anaerobic power decrease with decreasing muscle temperature, as indicated by an average Q10 of 1.4 in the physiological muscle temperature range. The reduction in maximal aerobic power in the cold may be the consequence particularly of a decrease in O2 supply associated with reduced maximal cardiac output and muscle blood flow. On the other hand, the Q10 of the maximal anaerobic power should strictly depend on the reduced rate of ATP hydrolysis. The Q10 of the latter, however, according to Arrhenius law, should be 2 to 3 instead of 1.4.(ABSTRACT TRUNCATED AT 250 WORDS)
journal_name
Int J Sports Medjournal_title
International journal of sports medicineauthors
Ferretti Gdoi
10.1055/s-2007-1024634subject
Has Abstractpub_date
1992-10-01 00:00:00pages
S185-7eissn
0172-4622issn
1439-3964journal_volume
13 Suppl 1pub_type
杂志文章,评审abstract：:Pulse oximetry allows non-invasive monitoring of arterial oxygen saturation (SO2). To study the validity of pulse oximetry, comparative measurements were performed. During exhaustion limited exercise SO2-values measured by pulse oximetry (SO2puls), calculated SO2-values (algorithms of Kelman, Severinghaus, and Siggaar...
journal_title：International journal of sports medicine
pub_type： 杂志文章
doi：10.1055/s-2007-1024756
更新日期：1990-02-01 00:00:00
abstract：:Declines in exercise capacity throughout an individual's life span can affect function and can ultimately limit the ability to perform activities of daily living. Along with these changes in exercise capacity and function, studies have reported age-associated changes in several parameters of immune status including de...
journal_title：International journal of sports medicine
pub_type： 杂志文章,评审
doi：10.1055/s-2007-972697
更新日期：1997-03-01 00:00:00
abstract：:The 1982 Aberdeen marathon race was held on a cool (12 degrees C) day on a flat, fast course. Fifty-nine of the 750 runners volunteered to take part in this study: rectal temperature of these competitors was measured within 5 min of completing the race. Venous blood samples were obtained before and immediately after t...
journal_title：International journal of sports medicine
pub_type： 杂志文章
doi：10.1055/s-2008-1025806
更新日期：1985-02-01 00:00:00
abstract：:It has been suggested in previous studies that the difference in endurance performance between males and females is related to gender-specific differences in cardiac function. Other studies have not equated males and females for physical condition, and this may have contributed to the findings. The purpose of this stu...
journal_title：International journal of sports medicine
pub_type： 杂志文章
doi：10.1055/s-2007-1024696
更新日期：1991-08-01 00:00:00
abstract：:The total number of leucocytes, T lymphocyte subsets, mitogen induced proliferation of lymphocytes, Il-2 generation, adherence capacity and chemiluminescence of granulocytes were measured and a leukergy test performed in fifteen young cyclists. The investigations were carried out at rest at the beginning of a training...
journal_title：International journal of sports medicine
pub_type： 杂志文章
doi：10.1055/s-2007-1021067
更新日期：1994-08-01 00:00:00
abstract：:The purpose of the present study was to assess the effects of 2-mercaptoacetate (MA), an inhibitor of hepatic fatty acid oxidation, on the metabolic and pancreatic hormone response to a prolonged (3 h) swimming exercise. All rats were first adrenodemedullated and were either submitted for 3 weeks to a normal (5% fat) ...
journal_title：International journal of sports medicine
pub_type： 杂志文章
doi：10.1055/s-2007-1021021
更新日期：1994-02-01 00:00:00
abstract：:The purpose of this study was to measure and compare the total energy expenditure of the four competitive swimming strokes. Twenty-six swimmers of international level were submitted to an incremental set of 200-m swims (5 swimmers at Breaststroke, 5 swimmers at Backstroke, 4 swimmers at Butterfly and 12 swimmers at Fr...
journal_title：International journal of sports medicine
pub_type： 杂志文章
doi：10.1055/s-2006-923776
更新日期：2006-11-01 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：:Sprint cycling performance is heavily dependent on mechanical peak power output (PPO) and the underlying power- and torque-cadence relationships. Other key indices of these relationships include maximum torque (TMAX), cadence (CMAX) and optimal cadence (COPT). Two common methods are used in the laboratory to ascertain...
journal_title：International journal of sports medicine
pub_type： 杂志文章
doi：10.1055/a-0989-2387
更新日期：2019-12-01 00:00:00
abstract：:The purpose of this study was to examine the combined effects of drop-height and surface condition on drop jump (DJ) performance and knee joint kinematics. DJ performance, sagittal and frontal plane knee joint kinematics were measured in jump experienced young male and female adults during DJs on stable, unstable and ...
journal_title：International journal of sports medicine
pub_type： 杂志文章
doi：10.1055/s-0043-117610
更新日期：2018-01-01 00:00:00
abstract：:The effects of long distance running training (up to 40km/day) on the biomechanical properties of young canine articular cartilage were investigated using in situ indentation creep technique. The stiffness of articular cartilage was determined in the form of instantaneous and equilibrium shear moduli. The rate of cart...
journal_title：International journal of sports medicine
pub_type： 杂志文章
doi：10.1055/s-2007-1021056
更新日期：1994-07-01 00:00:00
abstract：:The aim of this study was to determine the effects of gender and chronic hyperactivity (training) on musculo-tendinous stiffness and joint flexibility and to examine in vivo whether those stiffness parameters were correlated. Thus, maximal isometric voluntary contraction, series elastic stiffness during wrist flexion ...
journal_title：International journal of sports medicine
pub_type： 临床试验,杂志文章
doi：10.1055/s-2003-39500
更新日期：2003-05-01 00:00:00
abstract：:The purpose of this study was to analyse intramuscular perfusion response in ultrastructural muscle lesions, by applying contrast-enhanced ultrasound (CEUS) to a delayed onset muscle soreness (DOMS) model. Results of this analysis were compared to high-resolution 3 Tesla MRI T2-weighted sequences. 14 healthy participa...
journal_title：International journal of sports medicine
pub_type： 杂志文章
doi：10.1055/s-0043-112501
更新日期：2017-10-01 00:00:00
abstract：:This study investigated the validity of the CSA activity monitor for assessment of the total amount of physical activity in adolescent athletes. Activity data were compared to data on daily energy expenditure and its derivatives measured by the doubly labeled water method. Seven athletes (speed skaters) with a mean ag...
journal_title：International journal of sports medicine
pub_type： 杂志文章
doi：10.1055/s-2000-8487
更新日期：2000-11-01 00:00:00
abstract：:Throwing arm injuries are common and often related to the shoulder external and internal rotation. Quantitative assessment may provide new insights to physical assessment and options for treatment. After having signed IRB approved consents and filled out injury questionnaires, 96 baseball pitchers were examined on bot...
journal_title：International journal of sports medicine
pub_type： 杂志文章
doi：10.1055/s-0031-1295440
更新日期：2012-06-01 00:00:00
abstract：:This study sought to determine if prophylactic ankle taping and bracing influenced vertical leg stiffness during hopping. Twenty healthy and physically active participants completed testing under three ankle stabilizer conditions, ankle tape, semi-rigid ankle brace or control (no stabilizer) during three separate sess...
journal_title：International journal of sports medicine
pub_type： 杂志文章
doi：10.1055/s-0028-1105930
更新日期：2009-05-01 00:00:00
abstract：:The purpose of the present study was to ascertain whether increase in step frequency at a given velocity during running reduces the lower extremity loading variables, which is associated with tibial stress fracture in runner. We hypothesized that the lower extremity loading variables at a given speed would be minimize...
journal_title：International journal of sports medicine
pub_type： 杂志文章
doi：10.1055/s-0031-1291232
更新日期：2012-04-01 00:00:00
abstract：:The purpose of this investigation was to determine the accuracy of the critical velocity (CV) test for predicting time to exhaustion (time limit = TL) during treadmill running. Ten adult males (mean +/- SD of age = 23 +/- 2 years) volunteered to perform a maximal treadmill test, a CV test, and five exhaustive treadmil...
journal_title：International journal of sports medicine
pub_type： 杂志文章
doi：10.1055/s-2007-1021242
更新日期：1992-02-01 00:00:00
abstract：:The study was performed on healthy volunteers subjected to submaximal physical exercise (75% VO2max). Activities of catalase (CT) (EC 1.11.1.6), glutathione peroxidase (GPO) (EC 1.11.1.9), superoxide dismutase (ZnCu-SOD) (EC 1.15.1.1) and malonyldialdehyde (MDA) concentration in blood platelets before and after physic...
journal_title：International journal of sports medicine
pub_type： 杂志文章
doi：10.1055/s-2007-1024655
更新日期：1991-02-01 00:00:00
abstract：:The oxygen uptake (VO2) attained during a constant speed 800-m pace trial on a treadmill is less than the maximal VO2 (VO2max) in male middle-distance runners with a high VO2max (i.e., > 65 ml x kg (-1) x min (-1)). We therefore investigated whether the VO2 attained was influenced by the pacing strategy adopted. Eight...
journal_title：International journal of sports medicine
pub_type： 杂志文章
doi：10.1055/s-2005-837468
更新日期：2006-01-01 00:00:00
abstract：:Circulating progenitor cells (CPC) are bone marrow-derived cells that are mobilized into the circulation. While exercise is a powerful mediator of hematopoiesis, CPC levels increase, and reports of their activation after different types of exercise are contradictory. Moreover, few studies have compared the possible ef...
journal_title：International journal of sports medicine
pub_type： 杂志文章,随机对照试验
doi：10.1055/s-0034-1394394
更新日期：2015-04-01 00:00:00
abstract：:The aim of this study was to compare heart rate variability (HRV) recovery after two iso-volume (5 km) exercises performed at different intensities. 14 subjects volunteered (25.17±5.08 years; 74.7±6.28 kg; 175±0.05 cm; 59.56±5.15 mL·kg(-1)·min(-1)) and after determination of peak oxygen uptake (VO2Peak) and the speed ...
journal_title：International journal of sports medicine
pub_type： 杂志文章
doi：10.1055/s-0042-100292
更新日期：2016-06-01 00:00:00
abstract：:This study compared rectal temperature (Tre), heat sensation and sweating between obese and non-obese boys during cycling in the heat. Participants (aged 12-15 years) were 17 obese and 16 non-obese (BMI=29.4±4.3 and 16.8±1.7 kg · m⁻², respectively) boys. They cycled for 30-min (50-55% VO(2peak)) in a climatic chamber ...
journal_title：International journal of sports medicine
pub_type： 杂志文章
doi：10.1055/s-0031-1301314
更新日期：2012-06-01 00:00:00
abstract：:In 1988 Segura and Ventura (14) reported that 1.2 g of L-Tryptophan (L-TRY) supplementation increased total exercise time by 49.4% when the subjects were running at 80% of maximal oxygen uptake (VO2max). In human performance research, acute improvements of that category are rather uncommon. Both for this reason and be...
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-2007-1021302
更新日期：1992-08-01 00:00:00
abstract：:The purpose of the present study was to correlate the acute and chronic decrease in blood pressure (BP) following resistance training (RT). 13 normotensive women (18-49 years) completed an acute whole body RT session with 3 sets of 10 repetitions at 60% 1RM and then 8 weeks of RT as follows: 3/week, 3 sets of 8-12 rep...
journal_title：International journal of sports medicine
pub_type： 杂志文章
doi：10.1055/s-0034-1382017
更新日期：2015-01-01 00:00:00
abstract：:The aim of this study was to evaluate whether endurance athletes who exhibit deep bradycardia are more prone to arrhythmias and reflex syncope than their non-bradycardic peers. 46 healthy men (ages 19-35) were divided into 3 groups based on whether they were sedentary (SED,<2 h/week) or endurance trained (ET,>6 h/week...
journal_title：International journal of sports medicine
pub_type： 杂志文章
doi：10.1055/s-0035-1569348
更新日期：2016-09-01 00:00:00
abstract：:The frequency of sister chromatid exchanges (SCE) in the peripheral blood lymphocytes of eighteen healthy old women with 88 style Taichiquan exercise was studied. When compared with eighteen old women without exercise, the training group showed a decreased frequency of SCE in cultured peripheral blood lymphocytes at r...
journal_title：International journal of sports medicine
pub_type： 杂志文章
doi：
更新日期：1990-04-01 00:00:00
abstract：:In the present prospective longitudinal study 17 male endurance trained athletes (cyclists and triathletes; age 23.4+/-6.7 years, VO2max 61.2+/-7.5 ml x min(-1) x kg(-1); means+/-SD) were investigated both during a state of overtraining syndrome (OT: N=15), mainly induced by an increase of exercise intensity, as well ...
journal_title：International journal of sports medicine
pub_type： 杂志文章
doi：10.1055/s-2007-971892
更新日期：1998-02-01 00:00:00
abstract：:This study investigated the effects of marine phytoplankton supplementation on 1) perceived recovery and ground reaction forces in humans following a non-functional overreaching resistance-training program and 2) myogenic molecular markers associated with muscle cell recovery in a rat model. In the human trial, a 5-we...
journal_title：International journal of sports medicine
pub_type： 杂志文章
doi：10.1055/a-1320-1061
更新日期：2020-12-22 00:00:00
abstract：:One hundred and three women who were habitual distance runners and 74 age-matched physically inactive women provided three-day diet records. Intergroup differences in intakes of energy nutrients, micronutrients, cholesterol and fiber were evaluated via analysis of variance and, to assess qualitative differences, via a...
journal_title：International journal of sports medicine
pub_type： 杂志文章
doi：10.1055/s-2007-1024838
更新日期：1990-12-01 00:00:00
