Effect of rolling resistance on poling forces and metabolic demands of roller skiing.

abstract：INTRODUCTION:It is well established that hemodynamic dysfunction, resulting in diminished upper-extremity work capacity, occurs in persons with spinal cord injury (SCI) as compared with those who are nondisabled (ND). Although it has been shown that persons with paraplegia display higher values of heart rate (HR) with ...

journal_title：Medicine and science in sports and exercise

authors： Jacobs PL,Mahoney ET,Robbins A,Nash M

更新日期：2002-09-01 00:00:00

abstract：PURPOSE:To examine whether normalized quadriceps and hamstring strength would predict quadriceps and hamstring muscle activation amplitudes and whether these neuromuscular factors would predict knee kinematics and kinetics during a drop jump task. METHODS:Thirty-nine females and 39 males were measured for isometric qu...

journal_title：Medicine and science in sports and exercise

authors： Shultz SJ,Nguyen AD,Leonard MD,Schmitz RJ

更新日期：2009-04-01 00:00:00

abstract：PURPOSE:We transposed the concept of effectiveness of force application used in pedaling mechanics to calculate the ratio of forces (RF) during sprint running and tested the hypothesis that field sprint performance was related to the technical ability to produce high amounts of net positive horizontal force. This abili...

journal_title：Medicine and science in sports and exercise

authors： Morin JB,Edouard P,Samozino P

更新日期：2011-09-01 00:00:00

abstract：INTRODUCTION:This study aimed to compare the efficacy of eccentrically focused resistance exercise (ECC RT) to concentrically focused resistance exercise (CNC RT) on knee osteoarthritis (OA) symptoms and strength. METHODS:Ninety participants consented. Participants were randomized to CNC RT, ECC RT, or a wait-list, no...

journal_title：Medicine and science in sports and exercise

authors： Vincent KR,Vasilopoulos T,Montero C,Vincent HK

更新日期：2019-10-01 00:00:00

abstract：PURPOSE:The study's purposes were to 1) assess changes in cardiorespiratory fitness (CRF) from 1998 to 2010, controlling for decimal age and body mass index (BMI), and 2) repeat the analysis in cohorts from 2005 to 2010, controlling for maturation, deprivation, and BMI. METHODS:A total of 27,942 (n = 14,247 boys) 9- t...

journal_title：Medicine and science in sports and exercise

authors： Boddy LM,Fairclough SJ,Atkinson G,Stratton G

更新日期：2012-03-01 00:00:00

abstract：PURPOSE:High school cross-country runners have a high incidence of injury, particularly at the shin and knee. An increased step rate during running has been shown to reduce impact forces and loading of the lower extremity joints. The purpose of this prospective study was to examine step rate as a risk factor for injury...

journal_title：Medicine and science in sports and exercise

authors： Luedke LE,Heiderscheit BC,Williams DS,Rauh MJ

更新日期：2016-07-01 00:00:00

abstract：:A previous study has shown that subjects who entrain breathing during cycling exhibit a lower oxygen consumption (VO2) compared with random breathing. We sought to investigate the hypothesis that entrainment of breathing during rowing improved biomechanical economy (reduced VO2) compared with spontaneous breathing. A ...

journal_title：Medicine and science in sports and exercise

authors： Maclennan SE,Silvestri GA,Ward J,Mahler DA

更新日期：1994-05-01 00:00:00

abstract：PURPOSE AND METHODS:It is commonly recognized that there is familial aggregation for physical activity level. However, the genes and sequence variants responsible for the familial clustering have not been investigated. We performed a genome-wide linkage scan based on 432 markers typed in 767 subjects from 207 families ...

journal_title：Medicine and science in sports and exercise

authors： Simonen RL,Rankinen T,Perusse L,Rice T,Rao DC,Chagnon Y,Bouchard C,Quebec Family Study.

更新日期：2003-08-01 00:00:00

abstract：PURPOSE:There is evidence that carbohydrate (CHO) mouth rinsing can improve endurance exercise performance as well as muscle force production and sprint performance. Whether the oral administration of non-CHO tastants also affects exercise performance is not known. The purpose of this study was to investigate whether m...

journal_title：Medicine and science in sports and exercise

authors： Gam S,Guelfi KJ,Fournier PA

更新日期：2014-08-01 00:00:00

abstract：:Healthy men (N = 33) and women (N = 73) participated in a 6-month exercise program three mornings per week, and their attendance scores (percent of total classes attended) were related to a variety of physiological, anthropometric, psychological, and demographic variables which were studied. These subjects were also g...

journal_title：Medicine and science in sports and exercise

authors： Gale JB,Eckhoff WT,Mogel SF,Rodnick JE

更新日期：1984-12-01 00:00:00

abstract：PURPOSE:To determine the reliability of motor-evoked potentials (MEP) obtained using transcranial magnetic stimulation (TMS) in the first dorsal interosseous (FDI) and biceps brachii muscles. METHODS:Fourteen college subjects attended the laboratory on three separate days. TMS was used to obtain MEP with the subject r...

journal_title：Medicine and science in sports and exercise

authors： Kamen G

更新日期：2004-09-01 00:00:00

abstract：PURPOSE:Resting cardiac vagal modulation (RCVM) and postexercise vagal reactivation (PEVR) are markers of parasympathetic activity. We investigated whether adaptations in these markers to aerobic training are influenced by baseline autonomic control. METHODS:Forty healthy men (19.2 ± 0.8 yr) of similar cardiorespirato...

journal_title：Medicine and science in sports and exercise

authors： Duarte A,Soares PP,Pescatello L,Farinatti P

更新日期：2015-06-01 00:00:00

abstract：INTRODUCTION:Recent studies suggested that muscle mass and muscle strength may independently or synergistically affect aging-related health outcomes in older adults; however, prospective data on mortality in the general population are sparse. METHODS:We aimed to prospectively examine individual and joint associations ...

journal_title：Medicine and science in sports and exercise

authors： Li R,Xia J,Zhang XI,Gathirua-Mwangi WG,Guo J,Li Y,McKenzie S,Song Y

更新日期：2018-03-01 00:00:00

abstract：PURPOSE:To validate the 7-d Physical Activity Recall (PAR) telephone interview version and its activity intensity categories. METHODS:Seventy-four adults (47 women, 27 men), ranging in age (18-67) and activity levels, were interviewed by phone and in-person using the same PAR protocol. Each participant wore a TriTrac-...

journal_title：Medicine and science in sports and exercise

authors： Hayden-Wade HA,Coleman KJ,Sallis JF,Armstrong C

更新日期：2003-05-01 00:00:00

abstract：PURPOSE:Physical activity (PA) associates with cardiovascular autonomic function, but the relationship with lifelong PA is unclear. We hypothesized that lifelong PA would associate with cardiovascular autonomic function in midlife. METHODS:At the age of 46 yr, the subjects of the prospective Northern Finland Birth Coh...

journal_title：Medicine and science in sports and exercise

authors： Kiviniemi AM,Perkiömäki N,Auvinen J,Herrala S,Hautala AJ,Ahola R,Tammelin T,Tulppo MP,Järvelin MR,Korpelainen R,Huikuri HV

更新日期：2016-08-01 00:00:00

abstract：:During exercise, especially endurance exercise in the heat, vital body fluids and essential ions are lost in sweat, and the body may deplete its glycogen stores. Unless essential body fluids are restored, these conditions can produce hypovolemia, hypoglycemia, hyponatremia, hyperthermia, and dehydration. Performance m...

journal_title：Medicine and science in sports and exercise

authors： Gisolfi CV,Duchman SM

更新日期：1992-06-01 00:00:00

abstract：PURPOSE:The purpose of this study was to evaluate physical performance (static and dynamic) of U.S. Air Force reservists after an eastbound air travel across seven time zones and to estimate the pharmacological aids slow-release caffeine and melatonin versus placebo in attempt to overcome the decline in performance. M...

journal_title：Medicine and science in sports and exercise

authors： Lagarde D,Chappuis B,Billaud PF,Ramont L,Chauffard F,French J

更新日期：2001-04-01 00:00:00

abstract：:Forty male and 40 female rats were randomly assigned to 1 of 4 experimental groups. Half of the animals of each gender were exercised by jumping (weighted by a vest with up to 70% body weight) to a height of 16 cm 20 times X d-1 (30 s between jumps) 5 d X wk-1 for 8 wk. Half of the exercised animals and half of the se...

journal_title：Medicine and science in sports and exercise

authors： Leeds EM,Wilkerson JE,Brown GD,Kamen G,Bredle D

更新日期：1986-12-01 00:00:00

abstract：PURPOSE:This study examined the validity of the assumption of lower-extremity kinematic parameter reproducibility and symmetry during running with different velocities and stride frequencies. METHODS:Each of 12 female long-distance runners ran on a treadmill in combinations of three different velocities (2.5, 3.0, and...

journal_title：Medicine and science in sports and exercise

authors： Karamanidis K,Arampatzis A,Brüggemann GP

更新日期：2003-06-01 00:00:00

abstract：PURPOSE:The main purpose of the present investigation was to test whether and to what extent familial/genetic factors are involved in the changes of postheparin lipoprotein lipase (deltaPH-LPL) activity and triglyceride (deltaTG) levels in response to exercise training. Additional hypotheses were also tested as to whet...

journal_title：Medicine and science in sports and exercise

authors： Hong Y,Rice T,Gagnon J,Pérusse L,Province M,Bouchard C,Leon AS,Skinner JS,Wilmore JH,Rao DC,Després JP

更新日期：2000-08-01 00:00:00

abstract：PURPOSE:The purpose of this study was twofold: (a) to measure the effects of temporal parameters on both ball velocity and upper limb joint kinetics to identify pathomechanical factors during the tennis serve and (b) to validate these pathomechanical factors by comparing injured and noninjured players. METHODS:The ser...

journal_title：Medicine and science in sports and exercise

authors： Martin C,Kulpa R,Ropars M,Delamarche P,Bideau B

更新日期：2013-11-01 00:00:00

abstract：:We studied gastric and intestinal function by gastric intubation/intestinal perfusion in six healthy male volunteers to evaluate optimal use of a 6% glucose-electrolyte (GES) solution. Gastric volume, residual volume, emptying rate, and secretion were measured for an initial 763 +/- 19 ml gastric load of GES and at th...

journal_title：Medicine and science in sports and exercise

authors： Duchman SM,Ryan AJ,Schedl HP,Summers RW,Bleiler TL,Gisolfi CV

更新日期：1997-04-01 00:00:00

abstract：:Although low back pain (LBP) is a widespread and disabling health problem, there is a lack of evidence based medicine with respect to its treatment and rehabilitation. A major reason for this is the poor understanding of the underlying mechanisms of the LBP syndromes. In an attempt to fill this gap, the present review...

journal_title：Medicine and science in sports and exercise

authors： Ebenbichler GR,Oddsson LI,Kollmitzer J,Erim Z

更新日期：2001-11-01 00:00:00

abstract：:Twenty subjects were randomly assigned to: 1) prophylactic ibuprofen (N = 5) [400 mg TID initiated 4 h before collection of baseline data and strenuous eccentric exercise bout], 2) therapeutic ibuprofen (N = 5) [400 mg TID initiated 24 h after baseline], 3) placebo (N = 5), or 4) control (N = 5). Muscle soreness perce...

journal_title：Medicine and science in sports and exercise

authors： Hasson SM,Daniels JC,Divine JG,Niebuhr BR,Richmond S,Stein PG,Williams JH

更新日期：1993-01-01 00:00:00

abstract：PURPOSE:The purpose of this investigation was to examine the effects of differing amounts of beta-hydroxy-beta-methylbutyrate (HMB), 0, 36, and 76 mg x kg(-1) x d(-1), on hematology, hepatic and renal function during 8 wk of resistance training. METHODS:Thirty-seven, untrained collegiate males and were randomly assign...

journal_title：Medicine and science in sports and exercise

authors： Gallagher PM,Carrithers JA,Godard MP,Schulze KE,Trappe SW

更新日期：2000-12-01 00:00:00

abstract：PURPOSE:The effect of exercise on body mass is likely to be partially mediated through changes in appetite control. However, no studies have examined the effect of chronic exercise on obestatin and cholecystokinin (CCK) plasma concentrations or the sensitivity to detect differences in preload energy in obese individual...

journal_title：Medicine and science in sports and exercise

authors： Martins C,Kulseng B,Rehfeld JF,King NA,Blundell JE

更新日期：2013-05-01 00:00:00

abstract：PURPOSE:During and following exercise there are a number of changes in pulmonary function, among which is a decrease in forced vital capacity (FVC). Several potential mechanisms may explain this decreased FVC, including an exercise-induced increase in thoracic blood volume. METHODS:We tested the hypothesis that altere...

journal_title：Medicine and science in sports and exercise

authors： Coast JR,O'Kroy JA,Akers FM 2nd,Dahl T

更新日期：1998-07-01 00:00:00

abstract：:Acute and chronic positive mood changes have been said to occur with running and jogging. It has been suggested that endogenous substances with opioid activity (endorphins) may serve as modulators of mood. The authors report experiments in which mood changes associated with long-distance running were measured by pre- ...

journal_title：Medicine and science in sports and exercise

authors： Markoff RA,Ryan P,Young T

更新日期：1982-01-01 00:00:00

abstract：PURPOSE:The study purposes were 1) to study the differences between perceived exertion measured by a generic (/10) or an individualized (/max value obtained during the test) score on the OMNI cycle scale (OMNImax and OMNI10) and the actual effort (peak oxygen consumption) at different stages of a maximal cycling test i...

journal_title：Medicine and science in sports and exercise

authors： Lemay V,O'Loughlin J,Tremblay A,Mathieu ME

更新日期：2013-05-01 00:00:00

abstract：PURPOSE:The effect of quantified resistance and high impact exercise training on bone mass as modified by age and oral contraceptive (OCont) use in young women was studied. METHODS:Women were categorized by age (18-23 vs 24-31 yr) and OCont use, and were then randomized into either three sessions of resistance exercis...

journal_title：Medicine and science in sports and exercise

authors： Weaver CM,Teegarden D,Lyle RM,McCabe GP,McCabe LD,Proulx W,Kern M,Sedlock D,Anderson DD,Hillberry BM,Peacock M,Johnston CC

更新日期：2001-06-01 00:00:00