Abstract:
:Fourteen male physical education students performed a single bout of running until exhaustion on the treadmill at 22 km/h and 7.5% slope. They received single oral doses of 100 mg bupranolol (nonselective beta-blockade), 100 mg metoprolol (beta-1-selective blockade), and placebo 60-90 min before running. Arterialized capillary blood was sampled repeatedly until 30 min after exercise for assessment of lactate and glucose. Adrenaline and noradrenaline were determined in venous plasma before and immediately after exercise. Running time until exhaustion was 49.3 +/- 2.3 s in the control experiment, 44.5 +/- 2.0 s with metoprolol, and 42.7 +/- 2.0 s with bupranolol. The reductions under beta-blockade were statistically significant. With both beta-blockers the increases of the lactate and glucose blood levels were significantly reduced, the levels being almost identical with metoprolol and bupranolol. The post-exercise levels of adrenaline and noradrenaline did not differ significantly between the control, metoprolol, and bupranolol experiments. It is concluded that determination of the lactate and glucose levels in blood did not allow assessment of the mechanism by which beta-blockade impairs the capacity for supramaximal exercise. Besides reduced anaerobic energy release due to inhibition of glycogenolysis, other beta-blocker effects are considered.
journal_name
Int J Sports Medjournal_title
International journal of sports medicineauthors
Schnabel A,Kindermann W,Salas-Fraire O,Cassens J,Steinkraus Vdoi
10.1055/s-2008-1026050subject
Has Abstractpub_date
1983-11-01 00:00:00pages
278-81issue
4eissn
0172-4622issn
1439-3964journal_volume
4pub_type
临床试验,杂志文章,随机对照试验abstract:BACKGROUND:In international cycling and cross-country skiing competitions, blood tests are used to unmask the performance enhancing misuse of erythropoietin. Haematocrit (cycling) and haemoglobin (cross-country skiing) limits have been set by international sporting federations (haematocrit 50%, haemoglobin 18.5 g/dl). ...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2000-3785
更新日期:2000-07-01 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::We investigated the early effects of whole body vibration (WBV) added to hypocaloric diet on insulin-resistance and other parameters associated with glucose regulation in sedentary obese individuals. We randomly assigned 34 patients to WBV plus hypocaloric diet (WBV group) or diet alone (CON group) for 8 weeks. Fastin...
journal_title:International journal of sports medicine
pub_type: 杂志文章,随机对照试验
doi:10.1055/s-0033-1354358
更新日期:2014-06-01 00:00:00
abstract::The relationship between running intensity and the accumulation of hypoxanthine and uric acid in plasma was studied in four well-trained runners. The runners each performed several 800-m runs at different velocities, each run being performed on separate days. Venous blood samples were collected before and at regular i...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2007-1024844
更新日期:1990-12-01 00:00:00
abstract::Twenty-six male runners aged 14-16 years not yet specifically trained for sprint or middle-distance running performed a field test with distances of 25 m, 75 m, and 1000 m. Before the field test they were designated as sprinters (n = 19) and middle-distance runners (n = 7) according to their self-assessment and the es...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2007-1024855
更新日期:1990-05-01 00:00:00
abstract::Altitude exposure leads to considerable weight loss. The different hypotheses that have been put forward to explain this phenomenon are discussed reviewing the literature: 1) a primary decrease of food intake due to loss of appetite caused, directly or indirectly, by hypoxia, changes of menus, comfort and habits, 2) a...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2007-1024616
更新日期:1992-10-01 00:00:00
abstract::The purpose of this study was to determine the effect of a reduced ventilatory frequency (Vf) on blood gases and acid-base changes during three intensities of cycling exercise. VO2max and lactate threshold workload (LaT) of six subjects were assessed on a Monark ergometer. Experimental rides were performed 1) with no ...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2007-1024657
更新日期:1991-02-01 00:00:00
abstract::Seventeen healthy male volunteers participated in this study designed to compare arterial with both arterialized venous and venous lactate kinetics after short exercise. Blood samples drawn before, during, and after bicycle exercise were analyzed continuously for lactate. A mathematical function incorporating two expo...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2007-1024867
更新日期:1989-02-01 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::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::Little information exists about the efficacy of various brace designs to restrict inversion during lateral movements. The purpose of the study was to determine whether semi-rigid stirrup (AirCast Sport Stirrup), semi-rigid modified stirrup (Malleoloc), or a soft, sleeve design (Swede-O) brace varied in their abilities...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2007-971151
更新日期:1999-08-01 00:00:00
abstract::Pre-exercise meals containing carbohydrates (CHO) are recommended to athletes, although there is evidence to suggest that a high fat meal prior to exercise increases utilisation of fats yet may not adversely affect performance. This study investigated the effect of a high fat and high CHO pre-exercise meal prior to hi...
journal_title:International journal of sports medicine
pub_type: 临床试验,杂志文章
doi:10.1055/s-0032-1321798
更新日期:2013-02-01 00:00:00
abstract::Ten untrained subjects and nine trained cyclists were examined during graduated ergometric exercise in the supine position. The levels of epinephrine and norepinephrine in the blood as well as the heart rate and oxygen intake were determined. At submaximum levels, epinephrine, norepinephrine, lactate, and the heart ra...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2008-1034601
更新日期:1981-08-01 00:00:00
abstract::This study compared the bowel function, fecal hemoglobin (Hb) loss, iron status and diets of 36 women of varying activity levels. In addition, we examined the effect of a marathon race on bowel function and fecal Hb loss in 15 of these women. The subjects were divided into 4 groups based on estimated daily exercise en...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2007-1024663
更新日期:1991-04-01 00:00:00
abstract::The present study aimed to evaluate the applicability of using a single slice cross-sectional area (CSA) of the skeletal muscle for estimating segmental skeletal muscle volume (SMV). By using MRI, the SMV of each of the upper arm, lower arm, upper leg, lower leg, and trunk was determined in 29 males. First, step-wise ...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-0033-1351251
更新日期:2014-06-01 00:00:00
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...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2008-1026093
更新日期:1982-11-01 00:00:00
abstract::Intermittent pneumatic compression (IPC) has gained rapid popularity as a post-exercise recovery modality. Despite its widespread use and anecdotal claims for enhancing muscle recovery there is no scientific evidence to support its use. 10 healthy, active males performed a strenuous bout of eccentric exercise (3 sets ...
journal_title:International journal of sports medicine
pub_type: 杂志文章,随机对照试验
doi:10.1055/s-0033-1337944
更新日期:2013-11-01 00:00:00
abstract::During the world junior speed skating championship 2002 all athletes (60 males, 56 females) were subjected to hematologic blood testing one day before the competition as requested by International Skating Union--ISU. This study aimed to obtain hematological reference values for junior athletes, whilst the influence of...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2005-865676
更新日期:2006-04-01 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: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 objectives of this study were to 1) continuously assess oxygen uptake during and after difficult sport rock climbing and 2) to evaluate the effects of active versus passive recovery on post-climbing blood lactate and hand grip strength. Fifteen expert rock climbers attempted to climb (i.e., red point lead) a 20 m ...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2000-302
更新日期:2000-04-01 00:00:00
abstract::The hypothalamic-pituitary-testicular (H-P-T) axis was evaluated in groups of endurance-trained (TRG) and untrained (UNT) males. Each group was subjected to: 1) a 4-h resting hormonal profile [testosterone (T), free-testosterone (FT), estradiol (E2), luteinizing hormone (LH), prolactin (PRL), and cortisol (C)], 2) a d...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2007-1024811
更新日期:1990-08-01 00:00:00
abstract::The purpose of this study was to assess the agreement in body composition measurements of wheelchair athletes using skinfolds, bio-impedance analysis (BIA) and air displacement plethysmography (ADP) relative to dual-energy X-ray absorptiometry (DXA). A secondary objective was to develop new skinfold prediction equatio...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-0042-104061
更新日期:2016-09-01 00:00:00
abstract::Unlike in Europeans and Africans, the relationship between the human guanine nucleotide binding beta polypeptide 3 (GNB3) C825T gene polymorphism (rs5443) and blood pressures is inconsistent in Asians. The aim of the study was to investigate whether the GNB3 genotype demonstrates different associations with resting bl...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-0029-1233465
更新日期:2009-12-01 00:00:00
abstract::The energy cost of the forms of locomotion discussed throughout this article is summarized in Table 9. This table, as well as the preceding sections of this article, are designed to provide a rather comprehensive and simple set of information for potential readers: medical doctors, who should be able to prescribe to t...
journal_title:International journal of sports medicine
pub_type: 杂志文章,评审
doi:10.1055/s-2008-1025736
更新日期:1986-04-01 00:00:00
abstract::This study assessed the validity of a photoplethysmographic heart rate (HR) monitor, the Polar OH1 in various sports performed in ecological conditions: running, cycling, soccer, kayaking, walking, tennis and fitness. Seventy trained athletes (56 males, 14 females) wore the Polar OH1 armband and the H7 chest belt duri...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/a-0875-4033
更新日期:2019-07-01 00:00:00
abstract::This study has attempted to describe the fiber composition and respiratory potential in the leg (gastrocnemius) muscle of highly trained, elite female distance runners. As noted, many of these women were competing successfully in middle-distance (1500-3000 m) rather than long distance (10 km and marathon) events. This...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2008-1025714
更新日期:1987-11-01 00:00:00
abstract::Cyclists often use heart rate limits or power output zones, obtained from lactate parameters during incremental exercise testing, to control training intensity. However, the relationship between heart rate or power output, and blood lactate can be changed by several factors including dehydration. Therefore, in the cur...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2005-837460
更新日期:2005-12-01 00:00:00
abstract::This study examined the physiological responses to cold stimulus during intermittent high-intensity exercise simulating on-snow alpine ski training. 7 male alpine skiers performed intermittent high-intensity exercises composed of 4 bouts of cycling exercise at 140% VO 2max intensity for 30 s with 10-min rests on a cyc...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-0033-1353146
更新日期:2014-05-01 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