Ice friction in speed skating: can klapskates reduce ice frictional loss?

abstract：:Muscle force can be transmitted via connective tissues to neighboring muscles. The goal of this research is to determine the extent to which this effects force summation between synergists during physiological conditions. This manuscript reviews two studies examining the interaction between synergists in cat hindlimb....

journal_title：Medicine and science in sports and exercise

authors： Sandercock TG,Maas H

更新日期：2009-01-01 00:00:00

abstract：PURPOSE:This study was conducted to determine if fifth-grade students who walked or bicycled to school on a regular basis were more physically active than those that did not. METHODS:The sample consists of 219 fifth-grade students (10.3 +/- 0.6 yr, 44% male, 58% minority) from eight randomly selected urban and suburba...

journal_title：Medicine and science in sports and exercise

authors： Sirard JR,Riner WF Jr,McIver KL,Pate RR

更新日期：2005-12-01 00:00:00

abstract：PURPOSE:Highly trained endurance athletes train and race at relatively high intensities and are often confronted with challenges throughout a running event. The purpose of this study was to examine the effects of the anticipation of a proposed challenge on effort sense, heart rate (HR), ventilation ([dotVE), and ventil...

journal_title：Medicine and science in sports and exercise

authors： Acevedo EO,Dzewaltowski DA,Kubitz KA,Kraemer RR

更新日期：1999-10-01 00:00:00

abstract：PURPOSE:The extent to which the diaphragm is targeted during a bout of inspiratory muscle training (IMT) is unknown. The purpose of this study was to characterize the relative activation patterns of the diaphragm and extradiaphragmatic inspiratory muscles during a bout of IMT and to determine whether diaphragmatic recr...

journal_title：Medicine and science in sports and exercise

authors： Ramsook AH,Koo R,Molgat-Seon Y,Dominelli PB,Syed N,Ryerson CJ,Sheel AW,Guenette JA

更新日期：2016-06-01 00:00:00

abstract：PURPOSE:In large epidemiologic studies, physical activity (PA) is often assessed using PA questionnaires (PAQ). Because available PAQ may not capture the full range of PA in which urban Chinese adults engage, a PAQ was developed for this purpose. We examined the validity of this PAQ and the 1-yr stability of PA in 545 ...

journal_title：Medicine and science in sports and exercise

authors： Peters TM,Shu XO,Moore SC,Xiang YB,Yang G,Ekelund U,Liu DK,Tan YT,Ji BT,Schatzkin AS,Zheng W,Chow WH,Matthews CE,Leitzmann MF

更新日期：2010-12-01 00:00:00

abstract：PURPOSE:The present study investigated the effects of three consecutive days of endurance training under conditions of low energy availability (LEA) on the muscle glycogen content, muscle damage markers, endocrine regulation, and endurance capacity in male runners. METHODS:Seven male long-distance runners (19.9 ± 1.1 ...

journal_title：Medicine and science in sports and exercise

authors： Kojima C,Ishibashi A,Tanabe Y,Iwayama K,Kamei A,Takahashi H,Goto K

更新日期：2020-01-01 00:00:00

abstract：PURPOSE:In order to investigate overtraining-related adaptations in the autonomic nervous system, cardiac autonomic activity was examined in a junior cross-country skier who presented with reduced performance in competitions, early breathlessness during training sessions, and accumulated central fatigue. METHODS:Power...

journal_title：Medicine and science in sports and exercise

authors： Hedelin R,Wiklund U,Bjerle P,Henriksson-Larsén K

更新日期：2000-09-01 00:00:00

abstract：PURPOSE:The purpose of this study was to determine whether there is a relationship between overall fitness improvement and varying amounts of running and movement mileage. METHODS:Subjects were male U.S. Navy recruits (N = 1703, 25 divisions), ages 17-35 yr (mean age = 20.1 +/- 2.9 yr), who attended boot camp from Apr...

journal_title：Medicine and science in sports and exercise

authors： Trank TV,Ryman DH,Minagawa RY,Trone DW,Shaffer RA

更新日期：2001-06-01 00:00:00

abstract：PURPOSE:Hyperventilation increases the clearance of carbon monoxide (CO) from blood; thus, we hypothesized that CO elimination would be enhanced with exercise. Accordingly, this study examined the effect of exercise on the half-life of carboxyhemolobin elimination. METHODS:Six healthy subjects (three males and three f...

journal_title：Medicine and science in sports and exercise

authors： Zavorsky GS,Smoliga JM,Longo LD,Uhranowsky KA,Cadman CR,Duffin J,Fisher JA

更新日期：2012-11-01 00:00:00

abstract：PURPOSE:To determine whether physical performance adaptation is impaired in smokers during early stages of military training and to examine some of the putative mechanistic candidates that could explain any impairment. METHODS:We examined measures of oxidative stress (malondialdehyde [MDA], lipid hydroperoxides), infl...

journal_title：Medicine and science in sports and exercise

authors： Siddall A,Bilzon J,Thompson D,Tauler P,Greeves J,Izard R,Stokes K

更新日期：2020-05-01 00:00:00

abstract：PURPOSE:The purpose of this study was to determine whether similar patterns of quadriceps dysfunction are observed when people with anterior cruciate ligament (ACL) deficiency perform static and dynamic tasks. METHODS:EMG data were collected from 15 subjects with an ACL deficient knee and 15 uninjured subjects as they...

journal_title：Medicine and science in sports and exercise

authors： Williams GN,Barrance PJ,Snyder-Mackler L,Buchanan TS

更新日期：2004-07-01 00:00:00

abstract：PURPOSE:The goal of this study was to explore the effect of lifelong aerobic exercise (i.e., chronic training) on skeletal muscle substrate stores (intramyocellular triglyceride [IMTG] and glycogen), skeletal muscle phenotypes, and oxidative capacity (ox), in older endurance-trained master athletes (OA) compared with n...

journal_title：Medicine and science in sports and exercise

authors： Dubé JJ,Broskey NT,Despines AA,Stefanovic-Racic M,Toledo FG,Goodpaster BH,Amati F

更新日期：2016-03-01 00:00:00

abstract：UNLABELLED:Skeletal muscle injury is major concern in sport- and occupation-related fields. PURPOSE:We investigated the effects of increasing stretch-shortening contraction (SSC) repetition number in vivo and the resulting changes in functional performance and quantitative morphometry in rat skeletal muscle. METHODS:...

journal_title：Medicine and science in sports and exercise

authors： Baker BA,Mercer RR,Geronilla KB,Kashon ML,Miller GR,Cutlip RG

更新日期：2007-08-01 00:00:00

abstract：:Endocrine effects of self-administration of high doses of anabolic steroids and testosterone were investigated in five power athletes during 26 wk of training, and for the following 12-16 wk after drug withdrawal. After 26 wk of anabolic steroid and testosterone administration, serum testosterone concentrations had in...

journal_title：Medicine and science in sports and exercise

authors： Alén M,Reinilä M,Vihko R

更新日期：1985-06-01 00:00:00

abstract：PURPOSE:Lower-limb muscle weakness has often been reported in COPD, and contributes to exercise intolerance. Controversial information is available regarding upper-limb muscle adaptations and the influence of muscle wasting on muscle weakness. We investigated leg and arm muscle function in 59 stable COPD patients (GOLD...

journal_title：Medicine and science in sports and exercise

authors： Franssen FM,Broekhuizen R,Janssen PP,Wouters EF,Schols AM

更新日期：2005-01-01 00:00:00

abstract：:Ingestion of fluids providing carbohydrate and electrolytes extends endurance times during prolonged exercise. To understand the contribution of these factors, we examined hormonal, physiologic, and metabolic responses to ingesting water (W) or a 7% glucose polymer/fructose/electrolyte solution (GPFE) in 10 men (age: ...

journal_title：Medicine and science in sports and exercise

authors： Deuster PA,Singh A,Hofmann A,Moses FM,Chrousos GC

更新日期：1992-01-01 00:00:00

abstract：UNLABELLED:Theoretically, critical torque (CT) is the maximal isometric torque that can be maintained without fatigue, and anaerobic work capacity (AWC) is the total "isometric work" associated with stored energy sources within the muscle. PURPOSE:The purpose of this study was twofold: 1) to determine whether there we...

journal_title：Medicine and science in sports and exercise

authors： Hendrix CR,Housh TJ,Mielke M,Zuniga JM,Camic CL,Johnson GO,Schmidt RJ

更新日期：2009-12-01 00:00:00

abstract：:Psychological consequences of exercise deprivation in habitual exercisers. The purpose of this investigation was to evaluate the influence of 3 d of exercise deprivation on selected psychological variables. Ten volunteers (4 female and 6 male) who regularly exercised 6-7 d.wk-1 for at least 45 min at a time participat...

journal_title：Medicine and science in sports and exercise

authors： Mondin GW,Morgan WP,Piering PN,Stegner AJ,Stotesbery CL,Trine MR,Wu MY

更新日期：1996-09-01 00:00:00

abstract：:We used an algebraic model of resting heart rate (HRr), HRr-mn (HRo), to compare resting parasympathetic (n) and sympathetic (m) influence, intrinsic heart rate (HRo), and resting autonomic balance (Abal) in ten endurance-trained (ET) and ten nontrained (NT) men. The values of m, n, and Abal were determined by selecti...

journal_title：Medicine and science in sports and exercise

authors： Smith ML,Hudson DL,Graitzer HM,Raven PB

更新日期：1989-02-01 00:00:00

abstract：:Bicycling is a complex sport in which an athlete's energy cost is related to two principal forces: air resistance when traveling on flat terrain, and gravity when traveling uphill. Both wind tunnel data and physiological measurements suggest that air resistance scales as body mass to about the 1/3 power. Thus, large c...

journal_title：Medicine and science in sports and exercise

authors： Swain DP

更新日期：1994-01-01 00:00:00

abstract：INTRODUCTION:The isometric muscle force attained after active stretch is greater than that attained in a purely isometric contraction. This property is referred to as residual force enhancement (RFE). Because RFE is thought to be caused by a titin-based passive force, it should be preserved in reduced contractile force...

journal_title：Medicine and science in sports and exercise

authors： Fukutani A,Herzog W

更新日期：2018-06-01 00:00:00

abstract：PURPOSE:To examine whether knowledge of the 1995 Centers for Disease Control and Prevention (CDC) and the American College of Sports Medicine (ACSM) national physical activity recommendations varies by sociodemographic, behavioral, and communication-related factors. METHODS:Cross-sectional analyses of 2381 participant...

journal_title：Medicine and science in sports and exercise

authors： Bennett GG,Wolin KY,Puleo EM,Mâsse LC,Atienza AA

更新日期：2009-10-01 00:00:00

abstract：PURPOSE:The purpose of this investigation was to determine heart rate (HR)/oxygen consumption (VO2) calibration curves for exercising and sedentary women during pregnancy and the postpartum periods. METHODS:Fifty-two women were studied at three time points: 20 wk gestation, 32 wk gestation, and 12 wk postpartum. Subje...

journal_title：Medicine and science in sports and exercise

authors： Pivarnik JM,Stein AD,Rivera JM

更新日期：2002-05-01 00:00:00

abstract：PURPOSE:Physical fitness and physical activity tracking data enhance our understanding as to when children settle into their long-term exercise and fitness patterns and, therefore. provide insight as to when programs focusing on preventing sedentary adults behaviors should be initiated. METHODS:In this paper, the trac...

journal_title：Medicine and science in sports and exercise

authors： Janz KF,Dawson JD,Mahoney LT

更新日期：2000-07-01 00:00:00

abstract：BACKGROUND:Pedometry methods for collecting data in young populations are advancing, but it is unclear how many days of data are enough for population monitoring. METHODS:Using random-digit dialing, 11,669 5- to 19-yr-olds were recruited into the Canadian Physical Activity Levels among Youth study and mailed a data co...

journal_title：Medicine and science in sports and exercise

authors： Craig CL,Tudor-Locke C,Cragg S,Cameron C

更新日期：2010-03-01 00:00:00

abstract：:A 23-yr-old female body builder injured her right wrist while training. A correct diagnosis of pure distal radio-ulnar dislocation, ulnar volar, was made, and reduction was successfully carried out. After removal of plaster, the patient complained of wrist pain and clicking. Surgical exploration revealed a ruptured tr...

journal_title：Medicine and science in sports and exercise

authors： Francobandiera C,Maffulli N,Lepore L

更新日期：1990-04-01 00:00:00

abstract：PURPOSE:This study aimed to examine the link between stress (measured via salivary cortisol and testosterone), cognition (measured via pupillometry, with greater pupil constriction and reduced pupil constriction latency associated with increased attention and improved information processing), and motor skill capacity (...

journal_title：Medicine and science in sports and exercise

authors： Serpell BG,Waddington G,McGrath B,Cook CJ

更新日期：2020-11-01 00:00:00

abstract：BACKGROUND:Interactive video game exercise leads to improved exercise adherence and health-related physical fitness in comparison to traditional stationary cycling. It has been postulated that interactive video game exercise has greater metabolic requirements than traditional cycling; however, this has not been tested ...

journal_title：Medicine and science in sports and exercise

authors： Warburton DE,Sarkany D,Johnson M,Rhodes RE,Whitford W,Esch BT,Scott JM,Wong SC,Bredin SS

更新日期：2009-04-01 00:00:00

abstract：PURPOSE:According to the force-velocity relationship of human skeletal muscle, the maximal load one can lift is limited by the concentric movement phase, and the eccentric phase is always underloaded. In the present study, we hypothesized that acute exercise training using an eccentric overload compared with standard l...

journal_title：Medicine and science in sports and exercise

authors： Hortobágyi T,Devita P,Money J,Barrier J

更新日期：2001-07-01 00:00:00

abstract：PURPOSE:Ipratropium bromide (IB) has been used to prevent exercise-induced bronchoconstriction (EIB), but its effect varies among individuals. We hypothesized that such variability may reflect individual differences in vagal activity (VA), and therefore determined whether a correlation exists between VA and the effect ...

journal_title：Medicine and science in sports and exercise

authors： Knöpfli BH,Bar-Or O,Araújo CG

更新日期：2005-03-01 00:00:00