Abstract:
:Controversy exists as to whether plasma volume (PV) expansion has the potential to increase maximal oxygen uptake (VO2max). In the present study, VO2max and exercise time to fatigue were measured in nine untrained men when plasma volume (PV) was normal and then again on the next day following two levels of PV expansion. Resting PV was expanded (via intravenous infusion of a 6% dextran solution) by 282 +/- 16 ml (i.e., PVX-1) and then by 624 +/- 26 ml (i.e., PVX-2). PVX-1 increased stroke volume (CO2 rebreathing) during submaximal exercise by 15% (P less than 0.05) above normal levels. VO2max following PVX-1 was increased 4% (P less than 0.05; 3.78 to 3.92 l/min) despite a 4% reduction in hemoglobin concentration. Exercise time to fatigue was also increased (P less than 0.05). PVX-2 resulted in an 11% (P less than 0.05) reduction in hemoglobin concentration during maximal exercise and a return of VO2max and exercise time to normal levels. In summary, we have observed in untrained men that 200-300 ml of PV expansion increases SV, measured during submaximal exercise, yet causes only a small amount of hemodilution. As a result, VO2max is increased slightly and performance is improved. Further PV expansion to levels 500-600 ml above normal results in an excessive hemodilution and a subsequent decline in VO2max and performance to normal levels. There is an optimal PV for eliciting VO2max in untrained men which appears to be approximately 200-300 ml above their normal levels.
journal_name
Int J Sports Medjournal_title
International journal of sports medicineauthors
Coyle EF,Hopper MK,Coggan ARdoi
10.1055/s-2007-1024774subject
Has Abstractpub_date
1990-04-01 00:00:00pages
116-9issue
2eissn
0172-4622issn
1439-3964journal_volume
11pub_type
杂志文章abstract::In major track and field competitions, the most risky discipline is the combined event. Therefore, we aimed to record and analyze the incidence and characteristics of sports injuries incurred during the Youth and National Combined Events Championships. During the French Athletics Combined Events Championships in 2010,...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-0031-1301332
更新日期:2012-10-01 00:00:00
abstract::High-speed running and sprinting training play an important role in the development of physical capabilities, sport-specific performance and injury prevention among soccer players. This commentary aims to summarize the current evidence regarding high-speed running and sprinting training in professional soccer and to i...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/a-1302-7968
更新日期:2020-12-08 00:00:00
abstract::To determine the adaptations of the autonomic nervous system in the control of heart rate and blood pressure induced by endurance training, 10 competitive cyclists aged 27 +/- 7 years and 10 age-, weight- and height-matched sedentary controls were subjected to Power Spectral Analysis of the RR interval and of blood pr...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2007-972828
更新日期:1996-04-01 00:00:00
abstract::The aim of this study was to examine the relationship between anthropometry, physical capacity, and sprint swimming performance in swimmers of both genders aged 12 - 14 years old. Anthropometric characteristics (body height and mass, total upper extremity, hand and foot lengths, chest circumference, certain body bread...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2004-817862
更新日期:2005-03-01 00:00:00
abstract::The optimal exercise modality for the improvement of health-related parameters and microvascular function in obese adolescents is not yet fully understood. Therefore, this study aimed to 1) compare the microvascular phenotype of obese and normal-weight adolescents; and 2) to determine the effects of a lifestyle interv...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/a-0577-4280
更新日期:2018-06-01 00:00:00
abstract::The hypothesis that blood biochemical measurements of iron (Fe), copper (Cu), magnesium (Mg) and zinc (Zn) nutritional status and dietary intakes of these minerals are useful predictors of 100-yd free-style swimming performance during actual competition was examined in five female and five male collegiate swimmers. Di...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2007-972891
更新日期:1996-10-01 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::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::Studies have shown that the 577R allele of α-actinin-3 (ACTN3) is more prevalent in sprint athletes than in the general population or in endurance athletes. We examined the distribution of ACTN3 R577X (rs 1815739) genotypes and alleles in the Taiwanese general population (603) and in elite sprint swimmers who had part...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-0030-1263115
更新日期:2011-06-01 00:00:00
abstract::Measurement of skeletal muscle strength gains increasing importance as outcome parameter in patients with chronic heart failure. This study aimed at establishing short-term reliability of isokinetic strength measurements of knee extensor and flexor muscles in 38 patients with chronic heart failure. Strength tests were...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2001-11360
更新日期:2001-01-01 00:00:00
abstract::The aim of the present study was to monitor the nutritional status of 9 Greek national top-level swimmers during a competitive season of eight months. The swimmers were assessed through recording of food and supplement intake, blood sampling, and anthropometry at four landmarks: in the beginning of the season (baselin...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2007-964907
更新日期:2007-09-01 00:00:00
abstract::In a group of male distance runners, 23 out of 45 athletes showed decreased serum ferritin values (< 35 micrograms). The high prevalence of a typical iron deficiency in runners was confirmed in a subgroup of eight athletes in which the iron metabolism was studied in detail using radio-iron labelling and liver iron qua...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2007-972881
更新日期:1996-10-01 00:00:00
abstract::Spatio-temporal, metabolic and psychometric responses during and after a 400-m freestyle swim trial were investigated for gender and skill-level effects. Thirty-four men and women, 18 national and international competitors and 16 recreational swimmers, were compared. Mean speed, stroke rate (SR), and stroke length (SL...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2006-924208
更新日期:2007-02-01 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::Postexercise proteinuria has been observed in healthy adults but there was a need for information in young individuals. Boys and girls (n = 170) from 6 to 18 years of age were submitted to maximal exercise by the 20-meter shuttle run test. Urine collection was made prior to and 30 min after completion of the run. Tota...
journal_title:International journal of sports medicine
pub_type: 临床试验,杂志文章
doi:10.1055/s-2007-972876
更新日期:1996-08-01 00:00:00
abstract::Little if any research has examined the variability in time to exhaustion (TTE) during submaximal treadmill running. This study investigated the test-retest reliability of submaximal treadmill TTE as a measure of endurance capacity. 16 endurance-trained males (n=14) and females (n=2) completed a run to exhaustion at 7...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-0035-1555928
更新日期:2016-03-01 00:00:00
abstract::In order to assess the changes in the cellular immune system, 27 healthy male subjects were selected who participate in leisure-time sports and in whom measurements of the lymphocyte subsets in venous blood were carried out before and after a standardized endurance exercise test (EI, 60 minutes in length, intensity: 6...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2007-1024777
更新日期:1990-04-01 00:00:00
abstract::500 and 69 male former elite athletes and 319 male controls completed a health questionnaire in 1985 and in 1995. Register data on the subjects were also collected. Subjects were aged 65 years or less and had no history of hypertension in 1985, and they had been healthy at the age of 20 years. The athletes were groupe...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2002-23176
更新日期:2002-04-01 00:00:00
abstract::Chlorhexidine-containing mouthwash (STRONG), which disturbs oral microflora, has been shown to diminish the rise in plasma nitrite concentration ([NO2-]) and attenuate the reduction in resting blood pressure (BP) typically seen after acute nitrate (NO3-) ingestion. We aimed to determine whether STRONG and weaker antis...
journal_title:International journal of sports medicine
pub_type: 杂志文章,随机对照试验
doi:10.1055/s-0035-1554700
更新日期:2015-12-01 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::We studied 12 highly trained athletes, 6 male ice-hockey players and 6 cross-country skiers (2 females, 4 males). All of them participated in a maximal electrically braked bicycle ergometer test in a hypobaric chamber at the simulated altitude of 3000m (520 mmHg) and in normobaric conditions two days apart in random o...
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-2007-972968
更新日期:1995-02-01 00:00:00
abstract:BACKGROUND:The purpose of this study was to examine some motor performance aspects of the unloaded lower extremity after Achilles tendon rupture repair. The measured motor performance aspects were simple reaction time, choice reaction time, speed of movement, foot tapping speed, and coordination. METHODS:Ninety patien...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2001-11345
更新日期:2001-02-01 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::To study the hypothesis that more severe damage, caused by controlled lengthening (L) contractions, results in greater myofiber hypertrophy compared to increase in fiber size followed shortening (S) contractions, tibialis anterior muscles of anesthesized male Wistar rats were subjected to 240 either L or S contraction...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2000-8869
更新日期:2000-02-01 00:00:00
abstract::Since the first official world championships in breath-hold diving (1996), a sport has developed where the athletes compete in various disciplines of breath-hold diving. One of the rules is that the diver should surface from a dive without showing any signs of hypoxia. Depending on the severity of hypoxia, a diver may...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2006-924361
更新日期:2007-04-01 00:00:00
abstract::The shock-absorbing characteristics of the heel pad in vivo were examined in adults (N = 16) and 7-year-old children (N = 5) using a drop-impact tester (wt = 5 kg). Impact velocities were 0.72 m/s and 0.93 m/s. It was found that in adults the average peak deceleration was 11.6 G at an impact velocity of 0.93 m/s. The ...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2007-1021184
更新日期:1993-08-01 00:00:00
abstract::External counterpulsation (ECP), an electrocardiogram-led sequential compression of lower limbs, has been recently proposed for sports recovery, but research is scant. This study examined the effects of an ECP session upon neuromuscular function (vertical jump and torque/velocity characteristics), biochemical response...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/a-0923-9144
更新日期:2019-08-01 00:00:00
abstract::The primary purpose of this investigation was to compare 31 competitive female swimmers with 31 competitive male swimmers on their perceptual responses to submaximal swimming. A secondary purpose was to evaluate the relationship between heart rate (HR) and perceived exertion (RPE) in swimming. Each swimmer completed a...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2007-1024707
更新日期:1991-08-01 00:00:00
abstract::It has been shown that bouts of high-intensity exercise may reduce subcutaneous adipose tissue more than low-intensity exercise. The aim of the present study was to examine if a discontinuous training protocol is more successful in reducing adipose tissue than a continuous endurance training protocol. Fourteen untrain...
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-2001-15643
更新日期:2001-07-01 00:00:00
abstract::Blood pressure (BP) assessment during resistance exercise can be useful to avoid high BP, reducing cardiovascular risk, especially in hypertensive individuals. However, non-invasive accurate technique for this purpose is not available. The aim of this study was to compare finger photoplethysmographic (FPP) and intra-a...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-0030-1252054
更新日期:2010-08-01 00:00:00