Abstract:
PURPOSE:The purpose of this study was to investigate the relationship between myosin heavy chain (MHC) composition and maximal contraction strength of the human quadriceps femoris muscle. METHODS:Muscle biopsies were obtained from m. vastus lateralis in your highly physical active males (N = 7). The MHC composition of muscle homogenates was determined by electrophoresis techniques (SDS-PAGE). Isokinetic peak torque and constant-angle torque (50 degrees knee flexion) were obtained during slow (30 degrees.s-1), medium (120 degrees.s-1), and fast (240 degrees.s-1) maximal concentric and eccentric quadriceps contractions and expressed relative to muscle volume. RESULTS:The percentage of MHC II in the quadriceps muscle was positively correlated (rs = 0.61-0.93; P < 0.05-0.01) to maximal concentric quadriceps strength obtained at medium to high knee angular velocity. In contrast, no consistent pattern of correlation was observed for maximal eccentric quadriceps strength. CONCLUSIONS:The relationship observed between muscular MHC composition and maximal contractile strength is suggested to appear as a consequence of MHC -related differences in contractile force-velocity characteristics and/or contractile Rate of Force Development (RFD).
journal_name
Med Sci Sports Exercjournal_title
Medicine and science in sports and exerciseauthors
Aagaard P,Andersen JLdoi
10.1097/00005768-199808000-00006subject
Has Abstractpub_date
1998-08-01 00:00:00pages
1217-22issue
8eissn
0195-9131issn
1530-0315journal_volume
30pub_type
杂志文章abstract:PURPOSE:We examined bilateral bone mineral density (BMD) in the arms of female college gymnasts to assess the relative contribution of high-impact loading forces versus daily activities on bone plasticity. METHODS:Twenty-five female collegiate gymnasts and 25 controls were studied. BMD of the lumbar spine, proximal fe...
journal_title:Medicine and science in sports and exercise
pub_type: 临床试验,杂志文章
doi:10.1097/00005768-200211000-00021
更新日期:2002-11-01 00:00:00
abstract::The purpose of the study was to evaluate selected parameters describing performance characteristics of a free-weight and isokinetic bench press. A secondary purpose was an attempt to clarify the technique requirements essential for a successful lift. Parameters describing the free-weight condition were generated from ...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:
更新日期:1985-06-01 00:00:00
abstract::The purpose of this experiment was to determine whether reflexive, or more broadly, automatic hamstrings excitation could be elicited during isometric, maximum effort, step increases in knee extension torque. Eight healthy subjects without lower extremity dysfunction or injury performed maximum effort isometric knee e...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:
更新日期:1992-10-01 00:00:00
abstract:PURPOSE:To investigate the effects of speech production on physiological responses during sub maximal exercise of various intensities. METHODS:Three constant levels running at work intensities corresponding to 65%, 75%, and 85% of the subjects' (N = 14) VO(2) max were performed with and without talking. These loads we...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1097/00005768-200208000-00016
更新日期:2002-08-01 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
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1097/00005768-200107000-00020
更新日期:2001-07-01 00:00:00
abstract::Ten eumenorrheic nonathletic women, aged 21-25, were studied on the 8th day following the LH peak in three consecutive cycles. Plasma level and metabolic clearance rate (MCR) of estradiol (E2) and progesterone (P) were measured before and during a 2-h continuous treadmill test at a speed corresponding to 70% of their ...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:
更新日期:1992-07-01 00:00:00
abstract:PURPOSE:To evaluate the relations between %HRmax, %HRR, %VO2max, and %VO2R in elite cyclists and to check whether the intensity scale recommended by ACSM in its 1998 position stand is also applicable to this specific population. METHODS:Twenty-six male elite road cyclists (25.1 +/- 0.7 yr, 71.0 +/- 1.2 kg, 70.9 +/- 1....
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/01.mss.0000246996.63976.5f
更新日期:2007-02-01 00:00:00
abstract:UNLABELLED:Nampt/pre-B-cell colony-enhancing factor/visfatin (visfatin) release from adipocytes has recently been suggested to be nutrient responsive and linked to systemic nicotinamide adenine dinucleotide biosynthesis and regulation of pancreatic beta-cell function. PURPOSE:We hypothesized that if visfatin does play...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/MSS.0b013e318195bad5
更新日期:2009-06-01 00:00:00
abstract:INTRODUCTION:This study examined the effect of endurance exercise on dendritic arborization in the dentate gyrus subregion in rodents exposed to a predator scent stress (PSS). METHODS:Sprague-Dawley rats were randomly assigned to one of four treatment groups. In two of the groups, rats were unexposed to PSS but either...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/MSS.0000000000001038
更新日期:2016-12-01 00:00:00
abstract:PURPOSE:Patellar tendon abnormality (PTA) on diagnostic imaging is part of the diagnostic criteria for patellar tendinopathy. PTA and altered landing strategies are primary risk factors that increase the likelihood of asymptomatic athletes developing patellar tendinopathy. Therefore, the aim of this study was to examin...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/MSS.0b013e318275e0f2
更新日期:2013-03-01 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
pub_type: 杂志文章
doi:10.1249/01.mss.0000179102.17183.6b
更新日期:2005-12-01 00:00:00
abstract::The close balance between the O2 requirement to perform exercise and the O2 supply was analyzed. A non-uniform capillary PO2 can result in anaerobic metabolism in some muscle fibers despite an apparently adequate mean capillary PO2. The pattern of lactate increase for constant work rates and incremental exercise is de...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/00005768-198606000-00017
更新日期:1986-06-01 00:00:00
abstract::: The relevance of translational medicine (bringing basic science methods "to the bed of patients") is universally recognized. Too often, however, the tools to be applied translationally are thought to derive only from the "-omics" (genomics, proteomics, transcriptomics, metabolomics, etc.) world. The failures of this...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章,评审
doi:10.1249/MSS.0000000000002056
更新日期:2019-11-01 00:00:00
abstract:PURPOSE:To investigate the effects of strenuous exercise on heart rate variability (HRV). METHODS:We evaluated the effects of exercise intensity and duration on HRV indices in 14 healthy trained subjects. Each subject exercised for 3, 6, and 9 min at 60 and 70% of the power achieved at maximal oxygen consumption (PVO2...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/01.mss.0000142403.93205.35
更新日期:2004-10-01 00:00:00
abstract::Regression analysis is often used to demonstrate associations among variables believed to be biologically related. Failure to demonstrate a "significant" relationship may be due to two factors: 1) the variables are truly unrelated, or 2) a relationship exists but goes undetected due to inadequate statistical power. In...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:
更新日期:1988-12-01 00:00:00
abstract:PURPOSE:Evasive sidestepping during sports commonly results in noncontact anterior cruciate ligament injuries. Sidestepping in response to different simple visual stimuli has been studied previously but never investigated using quasi-game-realistic visual conditions. We compared the biomechanics of high-level and low-l...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/MSS.0b013e318290c28a
更新日期:2013-09-01 00:00:00
abstract::Heavy whole-body exercise, requiring a 10- to 15-fold increase in minute ventilation, encroaches on the capacities of the respiratory muscle system to respond. Recently, using the technique of bilateral phrenic nerve stimulation, it has been shown that heavy endurance exercise (> 85% of VO2max) lasting > 8-10 min caus...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章,评审
doi:10.1097/00005768-199609000-00008
更新日期:1996-09-01 00:00:00
abstract:PURPOSE:This study investigated the changes in running mechanics and spring-mass behavior over a 24-h treadmill run (24TR). METHODS:Kinematics, kinetics, and spring-mass characteristics of the running step were assessed in 10 experienced ultralong-distance runners before, every 2 h, and after a 24TR using an instrumen...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/MSS.0b013e3181fec518
更新日期:2011-05-01 00:00:00
abstract:PURPOSE:Light-intensity physical activity (LIPA) accounts for much of adults' waking hours (≈40%) and substantially contributes to overall daily energy expenditure. Encompassing activity behaviors of low intensity (standing with little movement) to those of higher intensity (slow walking), LIPA is ubiquitous, yet littl...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/MSS.0000000000000631
更新日期:2015-10-01 00:00:00
abstract:PURPOSE:To investigate the relationship between baseline leisure-time physical activity and changes in leisure activity during follow-up on long-term weight changes. METHODS:We evaluated prospectively 11,974 participants (university graduates) who participated in a dynamic cohort (Seguimiento Universidad de Navarra co...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/MSS.0b013e318188607c
更新日期:2009-03-01 00:00:00
abstract::Throughout a beat swinging motion prior to a kip the gymnast changes the relative orientation of his legs and head-torso with respect to his arms. It was observed that if these changes occurred in a correct order he could rapidly increase his swing with his limited strength. If changes in orientation of the body parts...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:
更新日期:1980-04-01 00:00:00
abstract:PURPOSE:The purpose of the study was to investigate the core temperature responses to the induction of electrical exercise and to clarify whether an increase in temperature could be responsible for some of the observed reactions to acute and repeated exposure to electrical muscle stimulation. METHODS:The paralyzed thi...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1097/00005768-200103000-00015
更新日期:2001-03-01 00:00:00
abstract::Previous research on catecholamine (CA) response to exercise has linked heightened adiposity to a hypostress syndrome. In the present study a cognitive/psychomotor stressor was employed to determine whether this association exists during less metabolically challenging tasks. Moreover, because stress is manifested in a...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:
更新日期:1995-03-01 00:00:00
abstract::The assumption that lower extremity function is bilaterally symmetrical is prevalent throughout the biomechanics literature. The unilateral development of many overuse and acute injuries may suggest that this assumption is inaccurate. Analyses of bilateral function report conflicting results and may be partially attri...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:
更新日期:1994-09-01 00:00:00
abstract::In the present studies, the Leuven Tennis Performance Test (LTPT), a newly developed test procedure to measure stroke performance in match-like conditions in elite tennis players, was evaluated as to its value for research purposes. The LTPT is enacted on a regular tennis court. It consists of first and second service...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1097/00005768-199808000-00016
更新日期:1998-08-01 00:00:00
abstract:PURPOSE:The purpose of this study was to investigate the influence of different cycling cadences on metabolic and kinematic parameters during subsequent running. METHODS:Eight triathletes performed two incremental tests (running and cycling) to determine maximal oxygen uptake (VO2max) and ventilatory threshold (VT) va...
journal_title:Medicine and science in sports and exercise
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1097/00005768-200203000-00022
更新日期:2002-03-01 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
pub_type: 杂志文章
doi:10.1249/MSS.0b013e318299ae3b
更新日期:2013-11-01 00:00:00
abstract:PURPOSE:To describe the influence of caffeine on physiological responses to exercise in young children and determine whether sex differences in these responses exist. METHODS:Twenty-six healthy 7- to 9-yr-old boys and 26 healthy 7- to 9-yr-old girls volunteered to participate in a double-blind, randomized, double cros...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章,随机对照试验
doi:10.1249/01.mss.0000191189.40436.73
更新日期:2006-03-01 00:00:00
abstract:PURPOSE:A cyclical operational model is proposed to examine the interrelationship of a number of factors that are involved in sports injury epidemiology. In sports injury research, investigations often attempt to identify a unique risk factor that distinguishes an injured player. However, a wide variety of factors can ...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1097/00005768-200112000-00004
更新日期:2001-12-01 00:00:00
abstract::The uptake of zinc (Zn) into the plasma after the ingestion of 25 mg of Zn from multivitamin-mineral supplement was studied in 10 men during running (R) and control (C) conditions; the R was for 2 h at 60-65% of their maximal oxygen uptake. Subjects took the supplement with 200 ml of deionized water before the R or C ...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:
更新日期:1992-04-01 00:00:00