Abstract:
:The purpose of the study was to investigate whether severe fatigue, possibly leading to overreaching, could be diagnosed at an early stage by a combination of parameters. Seven well-trained male subjects (age [mean +/- SD]: 25.3 +/- 4.7 yr; body mass: 76 +/- 6.6 kg; VO2max: 61.1 +/- 7 ml.kg(-1).min(-1)) increased their training load by doubling their training volume and increasing the intensity by 15 % over a period of two weeks. Before and after this intensified training period subjects underwent a series of tests including a maximal incremental cycle ergometer test (Wmax) with continuous ventilatory measurements and blood lactate values, time trial, basal blood parameter tests (red and white blood profile), hormones [growth hormone (GH), insulin-like growth factor 1(IGF-1), adreno-corticotropic hormone (ACTH), cortisol], neuro-endocrine stress test [short insulin tolerance test (SITT), combined anterior pituitary test (CAPT) and exercise], a shortened Profile of Mood State (POMS), the estimated rate of perceived exertion (RPE) and a cognitive reaction time test. The intensified training period resulted in a significant increase of the training load (p <0.01), training monotony (p <0.01) and training strain (p <0.01). The RPE during training increased significantly (p <0.01) during the intensified training period. Total mood score obtained from the POMS tended to increase (p=0.06), reflecting an increase in worse mood state. A novel finding was that reaction times increased significantly, indicating that overreaching might adversely affect speed of information processing by the brain, especially for the most difficult conditions. After the intensified training period, neither changes in exercise-induced plasma hormone values, nor SITT values were observed. During the CAPT only cortisol showed a significant decrease after the intensified training period. Hemoglobin showed a significant decrease after the intensified training period whereas hematocrit, red blood cell count (RBC) and MCV tended to decrease. The intensified training had no effect on physical performance (Wmax or time trial), maximal blood lactate, maximal heart rate and white blood cell profile. The most sensitive parameters for detecting overreaching are reaction time performance (indicative for cognitive brain functioning), RPE and to a lesser extend the shortened POMS. This strongly suggests, that central fatigue precedes peripheral fatigue. All other systems,including the neuro-endocrine, are more robust and react most likely at a later stage in exhaustive training periods.
journal_name
Int J Sports Medjournal_title
International journal of sports medicineauthors
Rietjens GJ,Kuipers H,Adam JJ,Saris WH,van Breda E,van Hamont D,Keizer HAdoi
10.1055/s-2004-817914subject
Has Abstractpub_date
2005-01-01 00:00:00pages
16-26issue
1eissn
0172-4622issn
1439-3964journal_volume
26pub_type
临床试验,杂志文章abstract::Barefoot and minimal footwear running has led to greater interest in the biomechanical effects of different types of footwear. The effect of running footwear on dynamic stability is not well understood. The purpose of this study was to compare dynamic stability and impact loading across 3 footwear conditions; barefoot...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-0043-103090
更新日期:2017-06-01 00:00:00
abstract::The authors present dermatological signs in: a) rhythmic gymnastics athletes, b) male artistic gymnastics athletes, compared to a control group of fitness athletes. Athletes from the artistic gymnastics group were observed twice. The signs they showed on their first examination (20 days previous to the competition) we...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2004-815714
更新日期:2004-11-01 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::We have studied the effect of exercise on the percentage of free plasma estradiol 17-beta (E2) and testosterone (T) in 13 untrained (UT) and 8 trained (marathon runners, MR) eumenorrheic women. All women performed a standardized bicycle ergometer (UT) or treadmill (MR) test in the follicular and luteal phases of their...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2008-1025721
更新日期:1987-12-01 00:00:00
abstract::The purpose of this study was to examine whether lower body positive pressure (LBPP) could improve maximal performance in paraplegic subjects (P). LBPP may diminish venous blood pooling (VBP) below the lesion and, therefore, support the redistribution of blood during exercise. Twelve male P subjects with complete spin...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2007-1021192
更新日期:1993-10-01 00:00:00
abstract::A field test for the determination of anaerobic threshold (AT) based on the relationship between work intensity and heart rate was previously developed in adult runners (4) and then applied in various sports activities (3, 5, 9). In the current study the same relationship between running speed (S) and heart rate (HR) ...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2007-1024924
更新日期:1989-10-01 00:00:00
abstract::Signs of overuse after intense muscular exertion are well described in adults, while little research has been conducted in children. The aim of the study was to investigate some indirect markers of muscle damage in 13 years old boys following two different protocols of one-leg stepping exercise to exhaustion. This ste...
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-2007-971101
更新日期:1999-02-01 00:00:00
abstract::During rowing, the respiratory musculature is confronted with dual demands: assisting the propulsive force generation and as the effector for ventilatory control. We determined the pulmomechanical and breathing pattern features of rowing-induced hyperpnea in five national class rowers (18 years old). Each subject perf...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2007-1021217
更新日期:1993-09-01 00:00:00
abstract::The six-minute walk test (6MWT) is an inexpensive, quick and safe tool to evaluate the functional capacity of patients with heart failure and chronic obstructive pulmonary disease. The aim of this study was to determine the reproducibility of the 6MWT in overweight and obese individuals. We thus undertook a prospectiv...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-0029-1231043
更新日期:2009-10-01 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::To identify the risk factors of injuries in handball, 221 players were followed during one indoor season. The injury incidence was 4.6/1000 playing hours and 11.4/1000 game hours. The upper extremity was involved in 41% of the injuries including 21% finger sprains. Ankle sprains were the most common injury (33%), and ...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2007-1025037
更新日期:1988-10-01 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::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 expansio...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2007-1024774
更新日期:1990-04-01 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::The purpose of this study was to investigate the effects of a vibration training protocol and a conventional strength training program consisting of similar exercises on knee extensors and flexors strength and postural sway in middle-aged women. 38 women were randomly assigned into a Vibration Group (n=12, static and ...
journal_title:International journal of sports medicine
pub_type: 杂志文章,随机对照试验
doi:10.1055/s-0030-1249618
更新日期:2010-09-01 00:00:00
abstract::Dietary intake, plasma lipids, lipoprotein and apolipoprotein levels, anthropometric measurements and anaerobic performance were studied in eleven judo athletes during a period of weight maintenance (T1) and after a 7d food restriction (T2). Dietary data were collected using a 7-day diet record. Nutrient analysis indi...
journal_title:International journal of sports medicine
pub_type: 临床试验,杂志文章
doi:10.1055/s-2001-16244
更新日期:2001-08-01 00:00:00
abstract::Leptin, the product of the ob-gene, is specifically released by adipocytes. In addition to its metabolic function it seems to affect the feedback-mechanisms of the hypothalamic-pituitary-gonadal-axis. We studied 13 female juvenile elite gymnasts with anorexia athletica (AA) and 9 female patients with anorexia nervosa ...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-1999-8834
更新日期:1999-10-01 00:00:00
abstract::The postural control of ten male soccer players with functional instability (FI) of the ankle joint, i.e., recurrent sprains and/or a feeling of giving way, was studied before and after ankle disk training. Postural control was studied by means of stabilometry and an optoelectronic movement recording system. In the pr...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2007-1024996
更新日期:1988-04-01 00:00:00
abstract::To assess the effect of dietary manipulation on gross efficiency (GE), 15 trained male cyclists completed 3×2 h tests at submaximal exercise intensity (60% Maximal Minute Power). Using a randomized, crossover design participants consumed an isoenergetic diet (~4 000 kcal.day-1) in the 3 days preceding each test, that ...
journal_title:International journal of sports medicine
pub_type: 杂志文章,随机对照试验
doi:10.1055/s-0033-1348254
更新日期:2014-03-01 00:00:00
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::The purpose of this study was to establish if provision of CHO altered the mucosal immune and salivary cortisol responses to intermittent exercise in the heat. In a double-blind design, 10 males undertook soccer-specific intermittent exercise on a motorized treadmill on 2 occasions, each over 90 min and separated by 1...
journal_title:International journal of sports medicine
pub_type: 杂志文章,随机对照试验
doi:10.1055/s-0031-1271698
更新日期:2011-09-01 00:00:00
abstract::The effects of physical activity (PA) on bioenergetic characteristics were studied in 53 prepubertal boys. Maximal oxygen consumption (VO2max; direct method), maximal anaerobic power (Pmax, force-velocity test), and mean power in 30 s (P30s, Wingate test) were compared (mean +/- SD) in three groups of boys of the same...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2007-1021208
更新日期:1993-11-01 00:00:00
abstract::Muscle fiber distribution and muscle enzyme activity (m. vastus lat.) were investigated in 10 elite sprint cyclists and 12 nonathletes. The ratio of fast to slow muscle fibers was 2:3 in cyclists and 3:2 in nonathletes. The mean diameter of each muscle fiber type was significantly higher in the athletes. The mean enzy...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2008-1025778
更新日期:1986-10-01 00:00:00
abstract::The present study examined the behaviour of the Achilles tendon (AT) - triceps surae (TS) muscle complex during running and long jump take-off. High AT forces were measured in the push-off phase in running even with very low EMG activity. In the long jump, high rate of stiffness development was a characteristic of the...
journal_title:International journal of sports medicine
pub_type: 临床试验,杂志文章
doi:10.1055/s-2003-39082
更新日期:2003-04-01 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::This study evaluated the effect of ischemic preconditioning (IPC) on resistance exercise performance in upper limbs. After 12-RM load determination, 21 men attended 4 trials separated by 3 days in a randomized crossover design: IPC (4×5-min occlusion 220 mmHg/reperfusion 0 mmHg) in arms and in thighs, and SHAM (equal ...
journal_title:International journal of sports medicine
pub_type: 杂志文章,随机对照试验
doi:10.1055/s-0042-109066
更新日期:2016-09-01 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::This study evaluated the biceps femoris (BF), rectus femoris (RF), and vastus lateralis (VL) activation and activation ratios of a variety of resistance training exercises characterized by knee extension, and determined if subject strength or gender affects these variables. The exercises evaluated included the leg ext...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2008-1038785
更新日期:2009-01-01 00:00:00
abstract::Considerable interindividual variation in the response of blood pressure to exercise has been found. In this study the response of systolic blood pressure during a progressive maximal bicycle ergometer test was investigated in 747 physically active male subjects over age of 40 years with normal, borderline elevated, a...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2007-1025042
更新日期:1988-12-01 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