Abstract：
:The influence of a short, supramaximal task of 30 s duration on plasma volume (PV) was tested in 14 female physical education students. Hemoglobin (Hb), hematocrit (Hct), and osmolality (Osm) were tested pre- and post-exercise. Performance of the exercise test, consisting of 30 s all-out pedaling against a load of 4.4 J/kg body weight per pedal revolution, brought about a significant elevation in the measured variables. The changes in Hct, Hb, and Osm were 3.14%, 0.92g X dl-1, and 9.58 mOs/kg-1, respectively. The changes in PV, calculated from the increase in Hct alone and from changes in Hct and Hb, was found to be -10.4% and -11.2%, respectively. It is suggested that very short periods of maximal exercise can bring about some 10% - 15% drop in PV. Mechanisms for this decrease are not clear. It could result from changes in tissue osmolality, filtration pressure, or opening up of collapsed capillaries.
journal_name
Int J Sports Medjournal_title
International journal of sports medicineauthors
Rotstein A,Bar-Or O,Dlin Rdoi
10.1055/s-2008-1026093subject
Has Abstractpub_date
1982-11-01 00:00:00pages
230-3issue
4eissn
0172-4622issn
1439-3964journal_volume
3pub_type
杂志文章abstract：:The anaerobic threshold (AnT) seems to be not only a physiologic boundary but also a transition after which swimmers technique changes, modifying their biomechanical behaviour. We expanded the AnT concept to a biophysical construct in the four conventional swimming techniques. Seventy-two elite swimmers performed a 5×...
journal_title：International journal of sports medicine
pub_type： 杂志文章
doi：10.1055/a-0975-9532
更新日期：2020-05-01 00:00:00
abstract：PURPOSE:The modified Dmax method can accurately determine the second lactate threshold (LT2), which is valuable for predicting aerobic performance and prescribing exercise. The purpose of this study is to determine if the modified Dmax method can accurately find thresholds in VE (VT2), VCO2 (VCO2T), RER (RERT), and RR ...
journal_title：International journal of sports medicine
pub_type： 杂志文章
doi：10.1055/s-0043-125448
更新日期：2018-04-01 00:00:00
abstract：:Because metabolic heat production is proportional to the amount of work performed, the differences in core body temperature (Tcore) of humans exercising at similar absolute exercise intensities are due to differences in their efficiency of heat dissipation. The purpose of this paper is to delineate the effects of trai...
journal_title：International journal of sports medicine
pub_type： 杂志文章,评审
doi：10.1055/s-2007-971969
更新日期：1998-06-01 00:00:00
abstract：:The peripheral adaptation process associated with repeating eccentric training over a longer period of time was studied in m. vastus lateralis of eleven healthy males aged 24 +/- 4 years. The maximal dynamic concentric muscle strength was only slightly improved after 8 weeks of training. However, eccentric work capaci...
journal_title：International journal of sports medicine
pub_type： 杂志文章
doi：10.1055/s-2008-1026031
更新日期：1983-08-01 00:00:00
abstract：:During the period 1975-1981, 221 persons were treated conservatively at Tampere University Central Hospital for an acute knee ligament injury. A total of 194 patients (88%) were reexamined 8 +/- 3 years after the injury. In the clinical and radiological results, there were no significant differences between competitiv...
journal_title：International journal of sports medicine
pub_type： 杂志文章
doi：10.1055/s-2008-1025682
更新日期：1987-10-01 00:00:00
abstract：:This study examined the effect of exercise-induced dehydration by ~4% body mass loss on 5-km cycling time trial (TT) performance and neuromuscular drive, independent of hyperthermia. 7 active males were dehydrated on 2 occasions, separated by 7 d. Participants remained dehydrated (DEH, -3.8±0.5%) or were rehydrated (R...
journal_title：International journal of sports medicine
pub_type： 杂志文章,随机对照试验
doi：10.1055/s-0033-1364022
更新日期：2014-08-01 00:00:00
abstract：:The aim of the current study was to determine the validity of an automated multiple-camera tracking system (Venatrack™), for the measurement of speed during soccer. 18 recreationally active males (mean age 27±8.6 years) performed a series of runs (total 391), representative of the movements made by soccer players, at ...
journal_title：International journal of sports medicine
pub_type： 杂志文章
doi：10.1055/s-0032-1306326
更新日期：2012-08-01 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：:Decreased ability to perform activities of daily living (ADLs) associated with deterioration in physical capacity are key determinants of the poor quality of life and loss of independence of patients with Alzheimer's disease (AD). The purpose of this study was to determine the effects of a 12-week training program (in...
journal_title：International journal of sports medicine
pub_type： 杂志文章,随机对照试验
doi：10.1055/s-2008-1038432
更新日期：2008-10-01 00:00:00
abstract：:The possible peripheral and/or central origin in the mechanisms responsible for day-time fluctuation in maximal torque of the triceps surae muscle were investigated with a special emphasis on antagonist muscle coactivation. Eleven healthy male subjects (physical education students) took part in this investigation. The...
journal_title：International journal of sports medicine
pub_type： 杂志文章
doi：10.1055/s-2005-837618
更新日期：2006-03-01 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：:Leukocytosis was postulated to accompany short- and medium-length exercise; in this report, we have studied the changes in leukocyte count during and following prolonged exercise. White blood cell (WBC) counts were obtained in 15 endurance-trained subjects before, during, and at a recovery period after an ultralong ex...
journal_title：International journal of sports medicine
pub_type： 临床试验,杂志文章
doi：10.1055/s-2008-1025664
更新日期：1987-08-01 00:00:00
abstract：:The aims of the study were to investigate the presence of a relative age effect and the influence of birth quarter on anthropometric characteristics, an estimation of biological maturity and performance in the Yo-Yo Intermittent Recovery Test level 1 in 606 elite, Flemish youth soccer players. The sample was divided i...
journal_title：International journal of sports medicine
pub_type： 杂志文章
doi：10.1055/s-0032-1311654
更新日期：2012-12-01 00:00:00
abstract：:The maximal power that muscles can generate is reduced at low muscle temperatures. However, in prolonged heavy exercise in the heat, a high core temperature may be the factor limiting performance. Precooling has been shown to delay the attainment of hyperthermia. It is still unclear if the whole body should be cooled ...
journal_title：International journal of sports medicine
pub_type： 杂志文章
doi：10.1055/s-2005-865746
更新日期：2006-05-01 00:00:00
abstract：:The aim of the present study was to identify anthropometric, physical, coordinative and ice-skating specific characteristics that discriminate young elite ice skaters from non-elite skaters and their non-skating peers. 32 skaters aged 9-12 years old (11 elites and 21 non-elites) voluntarily participated in the study. ...
journal_title：International journal of sports medicine
pub_type： 杂志文章
doi：10.1055/s-0042-100280
更新日期：2016-06-01 00:00:00
abstract：:In order to evaluate a mechanism which may be responsible for the often observed acute increase in residual lung volume (RV) following exercise, 12 non-smoking males (20-30 yrs) performed two bouts of exercise on separate days; one to maximal heart rate (HRmax) and one to 85% of HRmax for 20 min. Prior to exercise and...
journal_title：International journal of sports medicine
pub_type： 杂志文章
doi：10.1055/s-2007-1021039
更新日期：1994-04-01 00:00:00
abstract：:This investigation evaluated the effects of beverage carbonation and carbohydrate (CHO) content on fluid replacement following exercise/thermal dehydration. On four occasions separated by at least 7 days, eight healthy men cycled at 50% of VO2max in a hot environmental chamber (40 degrees C, 40% relative humidity) unt...
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-2007-1021268
更新日期：1992-05-01 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：:This study was undertaken to assess whether ventilatory anaerobic threshold (T vent) reflected endurance capacity (EC) in sports medical control. Fifteen subjects performed two cycle ergometer tests. The first was a maximal exercise test, which consisted of increasing the load 20 W/min until exhaustion. During this te...
journal_title：International journal of sports medicine
pub_type： 杂志文章
doi：10.1055/s-2008-1025654
更新日期：1987-06-01 00:00:00
abstract：:The purpose of this study was to determine whether preferred pedal rate (PPR) could be used as an index of cycling performance. Thirteen competitive cyclists cycled at PPR during a graded test and a supra-threshold constant power test (CPT). The results showed that PPR values reported in CPT were correlated to both pe...
journal_title：International journal of sports medicine
pub_type： 临床试验,杂志文章
doi：10.1055/s-2004-821022
更新日期：2005-06-01 00:00:00
abstract：:Muscular deficits in the hip abductors are presumed to be a major factor in the development of Iliotibial Band Syndrome in runners. No definite relationship between muscular weakness of the hip abductors and the development of Iliotibial Band Syndrome or different ratios between hip adduction to abduction have been re...
journal_title：International journal of sports medicine
pub_type： 杂志文章
doi：10.1055/s-2007-989323
更新日期：2008-07-01 00:00:00
abstract：:The aim of the present study was to investigate the relationship between maximal fat oxidation rate (MFO) measured during a progressive exercise test on a cycle ergometer and ultra-endurance performance. 61 male ironman athletes (age: 35±1 yrs. [23-47 yrs.], with a BMI of 23.6±0.3 kg/m2 [20.0-30.1 kg/m2], a body fat p...
journal_title：International journal of sports medicine
pub_type： 杂志文章
doi：10.1055/s-0043-117178
更新日期：2017-11-01 00:00:00
abstract：:Cough and chest wall pain at high altitude have only received passing mention in the medical literature. Increased minute ventilation of cold dry air at very high altitude is likely to cause airway irritation. This in turn may result in airway drying, mucus production, postnasal drip from vasomotor rhinitis, and bronc...
journal_title：International journal of sports medicine
pub_type： 杂志文章
doi：10.1055/s-2007-971908
更新日期：1998-04-01 00:00:00
abstract：:Cardiac vagal tone (CVT), a key determinant of resting heart rate (HR), is progressively withdrawn with incremental exercise and nearly abolished at maximal effort. While maximal HR decreases with age, there remains a large interindividual variability of results for any given age. In the present study, we hypothesized...
journal_title：International journal of sports medicine
pub_type： 杂志文章
doi：10.1055/s-0032-1323818
更新日期：2013-06-01 00:00:00
abstract：:To determine the effects of aerobic fitness on pregnancy and the newborn, 20 primigravid subjects were studied throughout gestation and immediately postpartum. The subjects were classified as trained (T = 10) or untrained (UT = 10) based on the heart rate response to submaximal cycle ergometry testing done in each tri...
journal_title：International journal of sports medicine
pub_type： 杂志文章
doi：10.1055/s-2008-1025645
更新日期：1987-04-01 00:00:00
abstract：:The aims of this study were: to compare energy expenditure (EE) estimated from the existing GT3X accelerometer equations and EE measured with indirect calorimetry; to define new equations for EE estimation with the GT3X in youth, adults and older people; and to define GT3X vector magnitude (VM) cut points allowing to ...
journal_title：International journal of sports medicine
pub_type： 杂志文章
doi：10.1055/s-0033-1337945
更新日期：2013-11-01 00:00:00
abstract：:Phagocytic cells constitute the organism's first line of defence against external aggression. These cells carry out their non-specific defence function through what is known as the phagocytic process. This can be split up into several stages: adherence, chemotaxis, attachment, ingestion and killing of the foreign agen...
journal_title：International journal of sports medicine
pub_type： 杂志文章,评审
doi：10.1055/s-2007-1021133
更新日期：1994-10-01 00:00:00
abstract：:The nutrition of 57 native Bolivian boys living at high altitude (HA) in La Paz (+/- 4000 m) and of 63 boys living at low altitude (LA) in St. Cruz (+/- 400 m) is described. The dietary information was obtained with a 24-h recall method, by interviewing the child and mother. The food items are listed in household meas...
journal_title：International journal of sports medicine
pub_type： 杂志文章
doi：10.1055/s-2007-1021121
更新日期：1994-04-01 00:00:00
abstract：:In the last decade the study of the human muscle mechanics and energetics in physiology and pathology underwent a radical change. Indeed, the use of biopsy is being progressively accompanied by non-invasive techniques which allow a more integrative assessment of muscle function in vivo. Magnetic resonance imaging (MRI...
journal_title：International journal of sports medicine
pub_type： 杂志文章,评审
doi：10.1055/s-2007-972724
更新日期：1997-10-01 00:00:00
abstract：:The aim of this study was to compare hormonal changes in plasma total testosterone (T), cortisol (C), luteinizing hormone (LH), follicle-stimulating hormone (FSH) and prolactin (P) in two world-class teams, both consisting of 9 top male pro-cyclists, during a real sports situation (the 1998 "Vuelta a España", a 3-week...
journal_title：International journal of sports medicine
pub_type： 临床试验,杂志文章
doi：10.1055/s-2002-35532
更新日期：2002-11-01 00:00:00
