Abstract:
:Ten experienced weight lifters were studied to determine the influence of strenuous, free-weight, squat lift exercise on changes in plasma volume, mean arterial pressure, and the rate pressure product. After a 40-min postural adjustment prior to upright exercise, each subject completed eight sets of eight repetitions of the squat exercise at 55% of the one-repetition maximum. Electrocardiogram heart rate was monitored throughout the test, and blood pressure was determined at the completion of each exercise set. Arterialized capillary blood was drawn during sitting and standing pre-exercise and at the end of the second, fourth, sixth, and eighth sets for the measurement of hemoglobin, hematocrit, and plasma protein concentration, and after the last set for blood lactate. Five additional subjects participated in a postural control comparison. The results of the ANOVA showed a significant loss in plasma volume over the trials which was 2 1/2 times greater than for the control subjects (17.9 vs 7.7% loss) over the same period of time. Exercise rate pressure product increased by 2.85 times resting while only 1.1 times resting for the control subjects. An elevation in mean arterial pressure was found to be correlated to changes in plasma volume, r = -0.98. This study found that plasma volume is reduced while the rate pressure product is increased during the squat lift exercise.
journal_name
Med Sci Sports Exercjournal_title
Medicine and science in sports and exerciseauthors
Knowlton RG,Hetzler RK,Kaminsky LA,Morrison JJsubject
Has Abstractpub_date
1987-10-01 00:00:00pages
464-8issue
5eissn
0195-9131issn
1530-0315journal_volume
19pub_type
杂志文章abstract:PURPOSE:Despite endorsement by various health organizations, there is a lack of research on the effectiveness of perceptually regulated exercise training (PRET) as a method of exercise intensity prescription. The purpose of this study was to confirm the efficacy of an 8-wk PRET program clamped at RPE13 to improve aerob...
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.0b013e31824d266e
更新日期:2012-08-01 00:00:00
abstract::The past 10-15 yr have witnessed a rapid increase in the development of new (and not so new) statistical methods that capitalize on recent advances in high-speed computing. These computer-intensive methods are often broadly referred to as resampling techniques and take several forms depending on the specific details o...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:
更新日期:1994-07-01 00:00:00
abstract:INTRODUCTION:Acute bupropion (dopamine/noradrenaline reuptake inhibitor) administration significantly improved time trial performance and increased core temperature in the heat (30 degrees C). PURPOSE:The present study was performed to examine the effect of a dopaminergic reuptake inhibitor on exercise capacity and th...
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.0b013e3181659c4d
更新日期:2008-05-01 00:00:00
abstract:PURPOSE:This study aimed 1) to define the principal components of physical function assessed by 10 common lower extremity physical performance tests and 2) to derive a reduced-item set of physical performance tests that efficiently and accurately measures raw performance and limb symmetry on each underlying component i...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/MSS.0000000000002422
更新日期:2020-12-01 00:00:00
abstract::The abdomen is the principal site of fat deposition in men, and because abdominal fat is readily mobilized during exercise, the relative proportion of fat in the abdominal site may negatively correlate with the amount of regular physical activity, and even with physical fitness. This study presents data for regional f...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1097/00005768-199607000-00003
更新日期:1996-07-01 00:00:00
abstract:PURPOSE:To compare four different methods of measuring physical activity (PA) in adult women under free-living conditions. METHODS:Twelve women participated in a 7-d period during which PA was assessed via self-report, accelerometry and step-counting. Subjects wore at the waist a Tritrac-R3D accelerometer, a Computer ...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1097/00005768-200007000-00021
更新日期:2000-07-01 00:00:00
abstract::The effect of physical exercise and vitamin C on iron absorption after oral iron administration was investigated. Eight healthy male subjects without iron deficiency were studied after administration of 100 mg ferric sodium citrate complex, 100 mg ferric sodium citrate complex with 200 mg ascorbic acid, and without ir...
journal_title:Medicine and science in sports and exercise
pub_type: 临床试验,杂志文章
doi:10.1097/00005768-199612000-00005
更新日期:1996-12-01 00:00:00
abstract:PURPOSE:Skeletal muscle (SM), which is found mainly within the appendicular lean soft tissue (ALST) compartment, is a biological important body compartment. Simple and accurate methods to estimate both SM and ALST remain difficult to obtain. We aimed to develop and to cross-validate anthropometric models for ALST in at...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/MSS.0b013e31818ffe4b
更新日期:2009-04-01 00:00:00
abstract::This study investigated in rather specific wheelchair tests the relationships among estimates of isometric upper-body strength (Fiso), sprint power (P30), aerobic power (VO2peak), and maximal power output (POaer) in a group of 44 men (age 34 +/- 12 yr) with longstanding spinal cord injuries ranging from C4/C5 to L5. F...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/00005768-199307000-00016
更新日期:1993-07-01 00:00:00
abstract:INTRODUCTION:Androgen deprivation therapy (ADT) is associated with significant bone loss and an increase in fracture risk among prostate cancer survivors (PCS). We investigated whether impact + resistance training could stop ADT-related declines in bone mineral density (BMD) among PCS on ADT. METHODS:We randomized 51 ...
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.0000000000000265
更新日期:2014-08-01 00:00:00
abstract:PURPOSE:The purpose of the current study was to investigate the associations between the GNB3 C825T polymorphism, body fatness and fitness, and blood pressure in a sample of young Korean men. METHODS:A total of 282 apparently healthy Korean men (nonobese N = 152, obese N = 130) aged 19-33 yr participated in the study....
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/01.mss.0000170096.96662.05
更新日期:2005-07-01 00:00:00
abstract:PURPOSE:Heart rate (HR) is widely used to adjust exercise intensity in aerobic training. Training HR recommendations are calculated often from simple equations. Because at lactate steady state (LASS) may be an intensity of exercise eliciting similar objective measures of intensity and similar subjective measures of met...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1097/00005768-200205000-00024
更新日期:2002-05-01 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::The serum levels of testosterone, free testosterone, prolactin, follicle-stimulating hormone (FSH), and luteinizing hormone (LH) were measured at rest, during 45 min of exercise on a bicycle ergometer at 50% of the subjects' previously determined maximal oxygen uptake (VO2max), and during a 30-min recovery period. Ten...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:
更新日期:1985-02-01 00:00:00
abstract::Low-intensity exercise (less than or equal to 50% VO2max) has been demonstrated to produce heat acclimation (HA) in trained subjects. The purpose of this study was to determine whether shorter-duration, moderate-intensity exercise would also result in HA. Nine trained runners performed two 9-d exercise heat-stress pro...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/00005768-199010000-00012
更新日期:1990-10-01 00:00:00
abstract::Ten highly trained endurance athletes were studied to determine the effects of exposure to low ozone (O3) concentrations on simulated competitive endurance performance and associated physiological and subjective symptom responses. Each subject was randomly exposed to filtered air (FA), and to 0.12, 0.18, and 0.24 ppm ...
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:1986-08-01 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:PURPOSE:The cold pain sensitivity in fighter pilots was studied by using a cold pressor test. METHODS:The pilots were divided into two groups: one group consisting of eight pilots (N = 8) who had experienced several acute in-flight neck pain attacks, and the control group (N = 8) who had not experienced these pain con...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1097/00005768-199804000-00016
更新日期:1998-04-01 00:00:00
abstract:PURPOSE:For treatment of various knee disorders, muscles are trained in open or closed kinetic chain tasks. Coordination between the heads of the quadriceps muscle is important for stability and optimal joint loading for both the tibiofemoral and the patellofemoral joint. The aim of this study was to examine whether th...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/01.MSS.0000099107.03704.AE
更新日期:2003-12-01 00:00:00
abstract::The effects of supervised physical training (PT) and lifestyle education (LSE) on risk factors for coronary artery disease and non-insulin-dependent diabetes mellitus were compared in obese 7- to 11-yr-old black girls. The subjects were divided into two groups. The PT group (N = 12) completed a 5-d.wk-1, 10-wk, aerobi...
journal_title:Medicine and science in sports and exercise
pub_type: 临床试验,杂志文章
doi:10.1097/00005768-199601000-00009
更新日期:1996-01-01 00:00:00
abstract:PURPOSE:Although several studies have shown that immune cells stimulated by in vitro stress are capable to produce neurotrophins, there is still no evidence whether physiological stress, such as exercise, can modulate the in vivo levels of brain-derived neurotrophic factor (BDNF) in peripheral blood mononuclear cells (...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/MSS.0b013e31825ab69b
更新日期:2012-10-01 00:00:00
abstract::The purpose of this study was to examine the accuracy and quality of a series of cycle ergometry tests used to estimate maximal aerobic capacity (VO2max). One-hundred nine males and 71 females participated in five tests: a maximal exercise test on the treadmill, three Air Force Cycle Ergometry Tests (AF1, AF2, AF3), a...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1097/00005768-199711000-00019
更新日期:1997-11-01 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::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
pub_type: 杂志文章
doi:10.1249/00005768-198902000-00008
更新日期:1989-02-01 00:00:00
abstract::In embryonic chicken skeletal muscle, the presence of a ventricular myosin heavy chain (MHC) is demonstrated by reactivity with an anti-ventricular MHC antibody. Developmental repression of the ventricular MHC expression occurs earlier in embryonic fast twitch posterior latissimus dorsi (PLD) than in embryonic slow-to...
journal_title:Medicine and science in sports and exercise
pub_type: 临床试验,杂志文章
doi:
更新日期:1989-10-01 00:00:00
abstract:UNLABELLED:Hiking is a recreational activity shown to offer significant positive effects on the human body. However, walking downhill and external load carriage have both been shown to increase the risk of musculoskeletal pain and injury. The use of hiking poles has been demonstrated to be successful in reducing forces...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/01.mss.0000240328.31276.fc
更新日期:2007-01-01 00:00:00
abstract:PURPOSE:The best sprint performances are usually reached between the ages of 20 and 30 yr; however, even in well-trained individuals, performance continues to decrease with age. Although this inevitable decrease in performance has been related to reductions in muscular force, velocity, and power capabilities, these mea...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/MSS.0000000000001039
更新日期:2016-12-01 00:00:00
abstract::The effect of glucose polymer (GP) ingestion upon endurance performance during walking exercise at 45% VO2max was examined. Also, performance on a battery of psychomotor tests was assessed to determine if exhaustion from endurance exercise was related to central nervous system dysfunction. Ten trained male subjects in...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:
更新日期:1983-01-01 00:00:00
abstract::Inappropriate cushioning and/or tractional characteristics of sports surfaces are assumed to increase surface-related injuries in various sports activities. Various tests assessing cushioning and frictional properties are currently in use to evaluate sports surfaces with respect to their potential to reduce the number...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章,评审
doi:
更新日期:1990-02-01 00:00:00
abstract:PURPOSE:The objective of this study was to examine the association of screen time viewing behavior with isometric trunk muscle strength in youth. METHODS:A cross-sectional study was carried out including 606 adolescents (14-16 yr old) participating in the Danish European Youth Heart Study, a population-based study wit...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/MSS.0b013e318295af56
更新日期:2013-10-01 00:00:00