Abstract:
:The way in which athletes achieve the necessary height to accomplish the rotational requirements of springboard dives was investigated by focusing upon the take-offs of dives from the forward and reverse groups. Films of eight women in the 3-m final of the 1982 Canadian championship and of five men practicing for the 1979 Fort Lauderdale Invitational Meet provided data for the analysis. The vertical acceleration of the diver's center of gravity was expressed relative to that of the metatarsals, which represented the point on the board directly beneath the feet. The divers were only able to accelerate upward relative to the metatarsals for approximately the first half of springboard depression. This period of positive relative acceleration was considered to be a key factor in effective deflection of the springboard. The lower extremities were responsible for about three-quarters of the diver's vertical acceleration during this period. Two-thirds of their contribution was attributed to their role in accelerating the large mass of the trunk upward. The upper extremities accounted for about 10% of the diver's vertical acceleration during the initial half of springboard depression. Their acceleration-time patterns clearly fell into three classifications depending upon whether their upward acceleration relative to the shoulders preceded, coincided with, or followed initial contact with the board for the take-off.
journal_name
Med Sci Sports Exercjournal_title
Medicine and science in sports and exerciseauthors
Miller DI,Munro CFdoi
10.1249/00005768-198406000-00007subject
Has Abstractpub_date
1984-06-01 00:00:00pages
234-42issue
3eissn
0195-9131issn
1530-0315journal_volume
16pub_type
杂志文章abstract:PURPOSE:Investigate hemodynamic responses of resistance exercise (RE) with moderate load (i.e., international guidelines for RE of patients) versus RE with high load in patients with coronary artery disease (CAD). METHODS:Medically stable male (n = 11) and female patients (n = 4) treated with PCI or percutaneous coron...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章,随机对照试验
doi:10.1249/MSS.0000000000000811
更新日期:2016-04-01 00:00:00
abstract:INTRODUCTION/PURPOSE:Critical power (CP) is a fundamental parameter defining high-intensity exercise tolerance; however, its physiological determinants are incompletely understood. The present study determined the impact of hyperoxia on CP, the time constant of phase II pulmonary oxygen uptake kinetics (τV˙O2), and mus...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/MSS.0000000000002234
更新日期:2020-05-01 00:00:00
abstract:INTRODUCTION:This study tested the hypothesis that females rely on thermal behavior to a greater extent during and after exercise, relative to males. METHODS:In a 24°C ± 1°C; (45% ± 10% RH) environment, 10 males (M) and 10 females (F) (22 ± 2 yr) cycled for 60 min (metabolic heat production: M, 117 ± 18 W·m; F, 129 ± ...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/MSS.0000000000001756
更新日期:2019-01-01 00:00:00
abstract::This study investigates the relationship between exercise and dietary macronutrient selection. Female Sprague-Dawley rats (5 months old) were placed on a macronutrient self-selection diet for 15 wk. Three food cups, each containing a separate vitamin and mineral supplemented macronutrient, i.e., fat, carbohydrate, or ...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:
更新日期:1994-12-01 00:00:00
abstract::A primary goal of studies of successful aging is to identify the modifiable factors related to the plasticity of higher physical function; however, little is known about the relationship between habitual physical activity (especially that of lower- to moderate-intensity) and the maintenance of day-to-day functioning i...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1097/00005768-199605000-00010
更新日期:1996-05-01 00:00:00
abstract:INTRODUCTION:Insulin resistance in obesity is decreased after successful diet and exercise. Aerobic exercise training alone was evaluated as an intervention in subjects with the metabolic syndrome. METHODS:Eighteen nondiabetic, sedentary subjects, 11 with the metabolic syndrome, participated in 8 wk of increasing inte...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/MSS.0b013e31829a6ce8
更新日期:2013-11-01 00:00:00
abstract::Increased vertical impact loading during running has been associated with a variety of running related injuries including stress fractures, patellofemoral pain, and plantar fasciitis. PURPOSE:The purpose of this study was to examine the acute and long-term effect of a gait retraining program aimed at teaching runners...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/MSS.0000000000001710
更新日期:2018-12-01 00:00:00
abstract:PURPOSE:This article reports on the findings and recommendations of the "Physiology of Sedentary Behavior and Its Relationship to Health Outcomes" group, a part of a larger workshop entitled Sedentary Behavior: Identifying Research Priorities sponsored by the National Heart, Lung, and Blood Institute and by the Nationa...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/MSS.0000000000000518
更新日期:2015-06-01 00:00:00
abstract:PURPOSE:To describe the mood profile of an America's Cup sailing team during competition and to evaluate the influence of previous injuries occurrence and intensity of physical work on the boat upon mood state. Relationships between mood domains and metabolic markers of muscle damage were also investigated. METHODS:A ...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/MSS.0b013e3181cd5cb9
更新日期:2010-07-01 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
pub_type: 杂志文章
doi:10.1249/MSS.0b013e3181e3b3f
更新日期:2009-04-01 00:00:00
abstract::To study the physiological responses to walking with hand-held weights (HWs), 12 untrained men completed three sub-maximal and two maximal treadmill tests. Heart rate, oxygen uptake, respiratory exchange ratio, ventilation, systolic blood pressure (BP), diastolic BP, rate pressure product, and rating of perceived exer...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:
更新日期:1987-06-01 00:00:00
abstract::Twenty well-trained runners (VO2max 4.6+/-0.5 L x min[-1]) were age and ability matched and assigned to either a cross training (CT) or run only group (RT). All subjects maintained normal running distance and intensity for 6 wk and reported for three additional training sessions per week. These workouts were performed...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1097/00005768-199802000-00019
更新日期:1998-02-01 00:00:00
abstract:INTRODUCTION & PURPOSE:Obesity-related increases of weight on the chest wall are known to decrease lung volume and chest wall compliance, but the effect of this mass loading, independent of other obesity-related complications on the ventilatory response to exercise is unknown. The purpose of this study was to investiga...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/01.mss.0000126386.12402.f5
更新日期:2004-05-01 00:00:00
abstract:PURPOSE:Compelling evidence suggests larger performance decrements during hypoxic versus normoxic repeated sprinting. Yet the underlying mechanical alterations have not been thoroughly investigated. Therefore, we examined the effects of different levels of normobaric hypoxia on running mechanical performance during rep...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章,随机对照试验
doi:10.1249/MSS.0000000000000937
更新日期:2016-08-01 00:00:00
abstract:PURPOSE:This study aimed to evaluate the effect of an exercise program of two different intensities, with nutritional control, on gestational weight gain (GWG), infant birth weight, and maternal weight retention at 2 months postpartum (2 mopp). METHODS:Pregnant women (prepregnancy body mass index = 18.5-24.9 kg·m) wer...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章,随机对照试验
doi:10.1249/MSS.0b013e31825365f1
更新日期:2012-08-01 00:00:00
abstract:PURPOSE:This study was conducted to test the hypothesis of autonomic imbalance in overtrained athletes during sleep and after awakening with analyses of heart rate variability (HRV) and nocturnal urine stress hormones. METHODS:We examined 12 athletes diagnosed to be severely overtrained (OA, 6 men and 6 women, mean ag...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/01.mss.0000184631.27641.b5
更新日期:2006-02-01 00:00:00
abstract:PURPOSE:To describe the level of usage of protective devices and equipment in a cohort of New Zealand rugby players. METHODS:Male and female players (N = 327) from a range of competitive grades were followed over the course of the season. Participants were interviewed weekly about their participation in rugby and use ...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1097/00005768-200112000-00024
更新日期:2001-12-01 00:00:00
abstract:PURPOSE:This study aimed to analyze the influence of foot strike pattern on running economy and biomechanical characteristics in subelite runners with a similar performance level. METHODS:Twenty subelite long-distance runners participated and were divided into two groups according to their foot strike pattern: rearfoo...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/MSS.0000000000000139
更新日期:2014-03-01 00:00:00
abstract:PURPOSE:Physiological and perceptual measures during interval exercise are not well understood. The current study therefore examined the correspondence between RPE, HR, and blood lactate concentration ([La]) during interval cycling. METHODS:VO2peak and the 4.0 mmol x L(-1) lactate threshold were determined. In session...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/01.mss.0000180359.98241.a2
更新日期:2006-01-01 00:00:00
abstract:PURPOSE:This study examines the usefulness of complementing accelerometry-based physical activity measurement with spatial data from portable global positioning system (GPS) units to determine where physical activity occurs. METHODS:First, using the geographic distribution of data points and Bland-Altman plots, we exa...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/01.mss.0000185297.72328.ce
更新日期:2005-11-01 00:00:00
abstract:PURPOSE:To continuously measure core temperature (T(c)) and heart rate(HR), and quantify fluid balance during a 21-km mass-participation road racein warm, humid environmental conditions. METHODS:Eighteen heat-acclimatized male soldiers ingested a telemetric Tc sensor on the evening prior to the race and wore an ambula...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/01.mss.0000218134.74238.6a
更新日期:2006-05-01 00:00:00
abstract:PURPOSE:A combination of endurance and strength training is generally used to seek further health benefits or enhanced physical performance in older adults compared with either of the training modes alone. The mean change within a training group, however, may conceal a wide range of individual differences in the respon...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/MSS.0b013e3181f1bf0d
更新日期:2011-03-01 00:00:00
abstract:PURPOSE:To evaluate the effect of maturity status on the autonomic nervous system at rest and recovery after short-term, high-intensity exercise in adolescents. METHODS:A biological maturity age was estimated in 27 males by calculating the years from peak height velocity (PHV) using a multiple regression equation. Sub...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/01.mss.0000218126.46242.2e
更新日期:2006-05-01 00:00:00
abstract::We examined whether the relation between of ratings of perceived exertion (RPE) and exercise intensities associated with the lactate threshold (LT) and blood lactate concentrations (BLC) of 2.5 and 4.0 mM, established with an incremental protocol, held during 30-min treadmill run at constant velocity (V). RPE (11.6, 1...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/00005768-199406000-00021
更新日期:1994-06-01 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::The present study was designed to assess the effects of acute exercise and short-term intensive training on catechol-O-methyltransferase (COMT) activity. COMT inactivates catecholamines and converts primary catecholestrogens (CE) into their O-methylated form yielding the 2- (2-MeOE) and 4-methoxyestrogens (4-MeOE). Bl...
journal_title:Medicine and science in sports and exercise
pub_type: 临床试验,杂志文章
doi:10.1097/00005768-199712000-00006
更新日期:1997-12-01 00:00:00
abstract:UNLABELLED:Clinical treatment in physical rehabilitation routinely uses perceived relative forces. PURPOSE:This study used psychophysical methods to quantify subjects' errors during submaximal muscular force production. METHODS:A sample of young adult (aged 23 +/- 3 yr) females (N = 60, 62 +/- 14 kg) and males (N = 5...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1097/00005768-200002000-00028
更新日期:2000-02-01 00:00:00
abstract::A rapid, transient, rise in cytoplasmic free calcium ion concentration ([Ca2+]i-transient) couples electrical excitation to contraction in muscle. Such [Ca2+]i-transients in muscle are actually subcellular spatio-temporal events that are determined dynamically by i) diffusional fluxes of Ca2+, ii) by the binding or un...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章,评审
doi:
更新日期:1991-10-01 00:00:00
abstract::The association of physical activity to the initiation of health risk behaviors was examined in a 3-yr prospective study of a population-based cohort of 1245 adolescents aged 12-16 yr. Four hundred thirty-seven students (35% of the cohort) were identified at baseline via self-report survey as never having smoked cigar...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:
更新日期:1995-12-01 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