Abstract：
:Ski charging was measured using giant-slalom style skis as gliding capacitors. The voltage measured across the plates was proportional to the charge on the base. While resting on dry snow or suspended in the air, the voltage was slowly reduced by the data logger itself. On wet snow the decay was much faster. While stationary on powder snow the ski developed a slightly negative voltage, showed a small, transient positive peak when motion began, rapidly dropped to negative values, and then assumed a quasi-steady climb to positive voltages. A great deal of noise was superimposed on the general features of the signal when skiing on hard or bumpy surfaces. Thus, the accumulation of charge to high levels was only possible with long runs in deep powder. The rate of charging increased with speed but was not affected by use of one "antistatic" wax, and another such wax actually increased the measured voltage over that of an unwaxed base.
journal_name
Med Sci Sports Exercjournal_title
Medicine and science in sports and exerciseauthors
Colbeck SCsubject
Has Abstractpub_date
1995-01-01 00:00:00pages
136-41issue
1eissn
0195-9131issn
1530-0315journal_volume
27pub_type
杂志文章abstract：PURPOSE:The purpose of this study was to examine the impact of exercise-induced metabolic stress on hormonal responses and chronic muscular adaptations. METHODS:We compared the acute and long-term effects of an "NR regimen" (no-rest regimen) and those of a "WR regimen" (regimen with rest period within a set). Twenty-s...
journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章
doi：
更新日期：2005-06-01 00:00:00
abstract：:The field of developmental neurobiology is entering a very exciting phase, in which the application of new techniques promises to lead to major advances in our understanding of basic developmental processes. There is a need to apply much of this new knowledge to problems of spinal cord and muscle development, about wh...
journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章,评审
doi：
更新日期：1985-02-01 00:00:00
abstract：:The gravity-dependency and age-dependency of noradrenergic vasoconstrictor outflow to skeletal muscle (muscle sympathetic nerve activity; MSNA) in humans was analyzed by applying microneurography technique. The basal level of MSNA in the horizontally supine position increased with aging without significant changes in ...
journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章
doi：10.1097/00005768-199610000-00039
更新日期：1996-10-01 00:00:00
abstract：UNLABELLED:This study examined the relationship of heart rate reserve (HRR: maximal heart rate - resting heart rate) and cardiovascular disease mortality (CVD) or all-cause mortality among healthy men. METHODS:Subjects were 27,459 healthy men, age 20-59 yr, who completed a maximal treadmill exercise test and answered ...
journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章
doi：10.1097/00005768-200212000-00003
更新日期：2002-12-01 00:00:00
abstract：PURPOSE:The purpose of study was to determine whether quadriceps/patella and Achilles tendon length and flexibility of the knee extensors and plantar flexors are related to walking and running economy. METHODS:Twenty-one male distance runners were subjects. Quadriceps/patella and Achilles tendon length were measured b...
journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章
doi：10.1249/MSS.0b013e318210464a
更新日期：2011-08-01 00:00:00
abstract：PURPOSE:To observe the effects of exercise training on plasminogen activator inhibitor, type-1 (PAI-1), tissue plasminogen activator (tPA), and associated metabolic variables in sedentary men and women. METHODS:A randomized, controlled experimental design was used to examine the influence of 10 d of moderate-intensity...
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：10.1249/01.MSS.0000093751.82616.F0
更新日期：2003-11-01 00:00:00
abstract：PURPOSE:Circulating angiogenic cells (CAC) comprise multiple subpopulations of exercise-inducible peripheral blood mononuclear cells (PBMC) that promote angiogenesis and maintain endothelial integrity. We examined the effect of acute maximal exercise on CD31, CD62E, CD14/CD31, CD34/VEGFR2, CD3/CD31, and CD3 PBMC in you...
journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章
doi：10.1249/MSS.0000000000001029
更新日期：2016-12-01 00:00:00
abstract：PURPOSE:The purpose of this study was to examine the ability of the YMCA submaximal exercise test protocol using a total body recumbent stepper to predict V˙O(2peak). METHODS:Of 112 individuals initially screened, 110 individuals with low to moderate cardiovascular disease risk met the inclusion criteria for participa...
journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章
doi：10.1249/MSS.0b013e31824f5be4
更新日期：2012-08-01 00:00:00
abstract：:Pyruvate and dihydroxyacetone are three carbon compounds that when infused directly into the blood or taken orally produce strong metabolic effects. When chronically fed to animals as part of their diet, pyruvate plus dihydroxyacetone reduce the rate of weight gain and body fat content during growth. These alterations...
journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章,评审
doi：10.1097/00005768-199806000-00010
更新日期：1998-06-01 00:00:00
abstract：:The purpose of this study was to determine whether the magnitude of the activation force, defined as the force that must be applied to the load cell in order to activate the resistance arm of an isokinetic dynamometer, affected knee extensor torques. Twenty-four healthy female subjects performed resisted knee extensio...
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：
更新日期：1991-02-01 00:00:00
abstract：:Equations are often used to predict cardiorespiratory fitness (CRF) from submaximal or maximal exercise tests. However, no study has comprehensively compared these exercise-based equations with directly measured CRF using data from a single, large cohort. PURPOSE:This study aimed to compare the accuracy of exercise-b...
journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章
doi：10.1249/MSS.0000000000002435
更新日期：2021-01-01 00:00:00
abstract：INTRODUCTION:The purpose of this study was to validate a parent proxy record of children's physical activity with CSA Model 7164 accelerometers. METHODS:A parent proxy record was developed to record children's activity after school on weekdays and all day long on weekends for 7 d. Parents recorded both duration and in...
journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章
doi：10.1249/01.mss.0000174906.38722.2e
更新日期：2005-08-01 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:Quadriceps strength deficits persist for years after anterior cruciate ligament (ACL) reconstruction, and patients with these deficits often shift torque demands away from the knee extensors to the hip during functional tasks. However, it is not clear how quadriceps strength deficits may affect hip strength. Th...
journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章
doi：10.1249/MSS.0000000000000999
更新日期：2016-10-01 00:00:00
abstract：:In this study the gross efficiency of swimming was determined in a group of male (N = 6) and female (N = 4) competitive swimmers. The gross efficiency is defined as the ratio of the power output (W) to the power input (W). In a range of swimming velocities (0.95-1.6 m.s-1), the power input (rate of energy expenditure,...
journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章
doi：
更新日期：1990-06-01 00:00:00
abstract：:A generalized knowledge of opiates has been available for centuries, but it was not until 1975, following the isolation of the first endogenous opioids, that it was appreciated that their analgesic properties were mediated via specific receptors. Three general classes of opioids are now recognized: the endorphins, the...
journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章,评审
doi：
更新日期：1985-02-01 00:00:00
abstract：PURPOSE:This study aimed to examine the effect of altering osmolality or adding sodium alginate and pectin to a concentrated carbohydrate (CHO) beverage on gastric-emptying (GE) rate. METHODS:Boluses (500 mL) of three drinks were instilled double blind in eight healthy men while seated, GE was measured using the doubl...
journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章
doi：10.1249/MSS.0000000000002301
更新日期：2020-08-01 00:00:00
abstract：PURPOSE:This study aimed to investigate longitudinal associations of objectively measured physical activity (PA) and sedentary behavior (SB) with body composition and physical fitness at a 12-month follow-up in healthy Swedish 4-yr-old children. METHODS:The data from the population-based MINISTOP trial were collected ...
journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章
doi：10.1249/MSS.0000000000001313
更新日期：2017-10-01 00:00:00
abstract：INTRODUCTION:Exercise-induced bronchoconstriction (EIB) is thought to result from osmotic and thermal events of air conditioning during exercise at high ventilation rates. The purpose of this study was to evaluate lung function after exercise and eucapnic voluntary hyperventilation (EVH) while breathing both room-tempe...
journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章
doi：10.1249/01.mss.0000158186.32450.ec
更新日期：2005-04-01 00:00:00
abstract：:Laboratory studies using direct calorimetry, a technique which is no longer either rare or difficult, have shown no essential differences between men and women who gain weight easily and the always lean. Both groups gained weight similarly when overeating by 1,000 kcal X d-1. Thermogenic responses to eating and the en...
journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章
doi：
更新日期：1986-02-01 00:00:00
abstract：PURPOSE:To optimize endurance cycling performance, it is important to maximize efficiency. Power-measuring cranks and force-sensing pedals can be used to determine the mechanical effectiveness of cycling. From both a coaching and basic science perspective, it is of interest if a mechanically effective pedaling techniqu...
journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章
doi：10.1249/mss.0b013e318043a235
更新日期：2007-06-01 00:00:00
abstract：:To compare the physiological response to a cocaine-exercise challenge in cocaine-conditioned animals with that of acute-cocaine animals, rats were injected i.p. with either cocaine (20 mg.kg-1) or saline, twice daily for 14 consecutive days. On the 15th day (test day) cocaine-conditioned rats received an i.v. injectio...
journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章
doi：
更新日期：1995-01-01 00:00:00
abstract：PURPOSE:We aimed to evaluate in a longitudinal study the effect of intensive training on cardiac autonomic control in athletes using 24-h heart rate variability analysis. METHODS:Time and frequency domain measures of heart rate variability were calculated from 24-h Holter monitoring in 15 high level bicyclists (mean a...
journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章
doi：10.1097/00005768-199805000-00008
更新日期：1998-05-01 00:00:00
abstract：PURPOSE:Although independent relationships between sitting behaviors (mainly television viewing) and health outcomes have been reported, few studies have examined the measurement properties of self-report sitting questions. This study assessed gender-specific test-retest reliability and validity of a questionnaire that...
journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章
doi：10.1249/MSS.0b013e3181c5ec18
更新日期：2010-06-01 00:00:00
abstract：PURPOSE:To assess physical activity, and its associations with health, clinical, and biochemical factors, in patients with stages 2-4 of chronic kidney disease (CKD). METHODS:Cross-sectional data were collected from 120 patients with CKD enrolled in the Lipid lowering and Onset of Renal Disease (LORD) trial. Patients ...
journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章
doi：10.1249/MSS.0b013e3181940aef
更新日期：2009-05-01 00:00:00
abstract：:Endurance performance is a common criterion used to evaluate training or dietary interventions. However, to accurately appraise the effects of an intervention, the endurance performance measure must be reliable. The purpose of the investigation was to establish the reliability of a 1-h endurance performance test. Twen...
journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章
doi：10.1097/00005768-199704000-00019
更新日期：1997-04-01 00:00:00
abstract：:The effects of metabolic alkalosis on muscle lactate accumulation and plasma catecholamine concentrations were studied in six highly trained subjects during short-term ergocycle exercises to exhaustion (375 W). The studies were performed after oral administration of NaHCO3 (alkalosis) and CaCO3 (placebo). There was a ...
journal_title：Medicine and science in sports and exercise
pub_type： 临床试验,杂志文章
doi：10.1249/00005768-198806000-00003
更新日期：1988-06-01 00:00:00
abstract：INTRODUCTION/PURPOSE:The goal of this program was to determine the feasibility of a novel noninvasive, highly miniaturized optomechanical earbud sensor for accurately estimating total energy expenditure (TEE) and maximum oxygen consumption (VO2max). The optomechanical sensor module, small enough to fit inside commercia...
journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章
doi：10.1249/MSS.0000000000000183
更新日期：2014-01-01 00:00:00
abstract：PURPOSE:The effects of chronic exercise training on the expression of heat shock protein (HSP) in skeletal muscle of senescent animals are unknown. Therefore, the purpose of this study was to investigate the effects of chronic exercise training on skeletal muscle HSP expression in both young and old rats. METHODS:Youn...
journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章
doi：10.1097/00005768-200105000-00008
更新日期：2001-05-01 00:00:00
abstract：:Six adult females with normal menstrual cycles (28-31 d in length) volunteered to exercise on a bicycle ergometer on five different days of their menstrual cycles (days 2, 8, 14, 20, and 26; day 1 = onset of menstruation). Each day the subjects exercised at a maximum work load (184.4 W) and at four submaximal exercise...
journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章
doi：
更新日期：1982-01-01 00:00:00
