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Sports Medicine and Health Science 2024年第4期6卷 315-323页

作者： Bridgette G.J.O'Malley Robert A.Robergs Todd A.Astorino Queensland University of Technology Faculty of Health:School of Exercise and Nutrition SciencesBrisbaneAustralia Department of Kinesiology CSU-San MarcosSan MarcosCAUSA

We hypothesized that slowed oxygen uptake(VO_(2))kinetics for exercise transitions to higher power outputs(PO)within the steady state(SS)domain would increase the mean response time(MRT)with increasing exercise intensity during incremental *** highly trained cyclists(mean±standard deviation[SD]);age(39±6)years[yr];and VO_(2) peak=(61±9)mL/kg/min performed a maximal,ramp incremental cycling test and on separate days,four 6-min bouts of cycling at 30%,45%,65%&75% of their incremental peak PO(Wpeak).SS trial data were used to calculate the MRT and verified by mono-exponential and linear curve *** the ramp protocol attained the value from SS,the PO,in Watts(W),was converted to time(min)based on the ramp function W to quantify the incremental MRT(iMRT).Slope analyses for the VO_(2) responses of the SS versus incremental exercise data below the gas exchange threshold(GET)revealed a significant difference(p=0.003;[0.437±0.08]vs.[0.382±0.05]L·min^(-1)).There was a significant difference between the 45%Wpeak steady state VO_(2)(ss VO_(2))([3.08±0.30]L·min^(-1),respectively),and 30% Wpeak ss VO_(2)(2.26±0.24)(pexercise intensities within the SS domain.

关键词： Mean responsetime(MRT) Incremental exercise Steady state(SS) exercise testing exercise prescription

QT hysteresis in long-QT syndrome children with exercise testing

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Chinese Medical Journal 2007年第3期120卷 179-182页

作者： GAO Dong-sheng FANG Wei-yi Christine Chiu-Man Joel Kirsh Gil Gross Robert M. Hamilton Department of Cardiology Shanghai Chest Hospital Shanghai200030 China Department of Cardiology Hospital for Sick Children Universityof Toronto Ontario M5G 1X8 Canada

Background Congenital long QT syndrome （LQTS） is an inherited ion channel disorder resulting in abnormal cardiac repolarization that can cause syncope and sudden death associated with a prolonged rate-corrected QT interval and polymorphic ventricular tachycardia. Several studies in adults showed that LQTS patients have altered QT adaptation to heart rate changes compared with normal subjects which forming a ＂hysteresis loop＂ in the QT-circle length plot. This study was to observe the QT interval changing during exercise testing in children long QT syndrome （LQTS） patients, explore the new diagnosis methods of LQTS. Methods The subjects were divided into 3 groups according to 1993 LQTS diagnostic criteria. Group 1： LQTS group （n=17） who scored 〉 or = 4 points indicating definite LQTS. Group 2： Middle group （n=16）, patients who have prolonged QT interval but scored 1.5 to 3.5. Group 3： Normal control group （n=18）. The average age of all study population is （12.3±5.8） years. No case had beta-adrenergic antagonists administration before exercise testing. All subjects were underwent tread mill exercise testing and electrocardiograph in whole exercise testing and recovery were recorded. QT and heart rate changing during whole exercise testing period were recorded. /kQT, the QT interval at 1, 2, 4, 6 minutes into recovery subtract from the QT interval at a similar heart rate during exercise, were calculated. Results In all three groups, QT intervals were shortening with the increasing of heart rate, but QTc had no significant change. ΔQT at 1 minute （（45±11） ms）, 2 minutes （（37±15） ms）, 4 minutes （（23±12） ms） into recovery in LQTS group were significantly greater than that of the other two groups （P〈0.05, P〈0.01, P〈0.01, respectively）. There was no ΔQT significant difference between middle group and normal control group at recovery time. During the recovery phase in LQTS group, the QT interval remained shortened despite a decelerating heart rate, forming a hysteresis ＂lo

关键词： long QT syndrome QT hysteresis exercise testing children

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Cardiorespiratory fitness and cancer in women:A prospective pilot study

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Journal of Sport and Health Science 2019年第5期8卷 457-462页

作者： Baruch Vainshelboim Ricardo M.Lima Jonathan Myers Master of Cancer Care Program School of Health SciencesSaint Francis UniversityLorettoPA 15940USA Cardiology Division Veterans Affairs Palo Alto Health Care System/Stanford UniversityPalo AltoCA 94304USA Faculty of Physical Education University of BrasiliaBrasilia 70910-900Brazil

Purpose:To assess the association between cardiorespiratory fitness(CRF)and the incidence and mortality from cancer in women,and to evaluate the potential public health implications for cancer ***:Maximal exercise testing was performed in a pilot cohort of 184 women(59.3 ± 15.2 years)who were followed for 12.0 ± 6.9 *** hazard models adjusted for established cancer risk factors and accounting for competing events were analyzed for all-type cancer incidence and mortality from ***-attributable risks and exposure impact number were determined for low CRF(exercise program could be a public health strategy for cancer prevention in middle-age women.

关键词： exercise capacity exercise testing Fitness Public health

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Association between physiological responses after exercise at low altitude and acute mountain sickness upon ascent is sex-dependent

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Military Medical Research 2021年第2期8卷 174-182页

作者： Yang Shen Yuan-Qi Yang Chuan Liu Jie Yang Ji-Hang Zhang Jun Jin Hu Tan Fang-Zheng-Yuan Yuan Jing-Bin Ke Chun-Yan He Lai-Ping Zhang Chen Zhang Jie Yu Lan Huang Institute of Cardiovascular Diseases of PLA the Second Affiliated HospitalArmy Medical UniversityChongqing 400037China Department of Cardiology the Second Affiliated HospitalArmy Medical UniversityChongqing 400037China

Background:Acute mountain sickness(AMS)is the mildest form of acute altitude illnesses,and consists of nonspecific symptoms when unacclimatized persons ascend to elevation of≥2500 *** factors of AMS include:the altitude,individual susceptibility,ascending rate and degree of *** the current study,we examined whether physiological response at low altitude could predict the development of ***:A total of 111 healthy adult healthy volunteers participated in this trial;and 99(67 men and 32 women)completed the entire study *** were asked to complete a 9-min exercise program using a mechanically braked bicycle ergometer at low altitude(500 m).Heart rate,blood pressure(BP)and pulse oxygen saturation(SpO2)were recorded prior to and during the last minute of *** ascent from 500 m to 4100 m was completed in 2 *** was defined as≥3 points in a 4-item Lake Louise Score,with at least one point from headache wat 6–8 h after the ***:Among the 99 assessable subjects,47(23 men and 24 women)developed AMS at 4100 *** comparison to the subjects without AMS,those who developed AMS had lower proportion of men(48.9%vs.84.6%,Pexercise at low altitude(OR=0.63,P=0.002)and systolic BP change after the ascent(OR=0.96,P=0.029).Women had larger reduction in SpO2 after the ascent,higher AMS percentage and absolute AMS *** reduction of SpO2 after exercise was associated with both AMS incidence(P=0.001)and AMS score(Pexercise at low altitude was an independent risk for AMS upon *** an association was more robust in men than in *** registration:Chinese Clinical

关键词： High altitude exercise testing Sex differences Acute mountain sickness Individual susceptibility

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Predicting muscular strength using demographics,skeletal dimensions,and body composition measures

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Sports Medicine and Health Science 2021年第1期3卷 34-39页

作者： Sean T.Stanelle Stephen F.Crouse Tyler R.Heimdal Steven E.Riechman Alexandra L.Remy Bradley S.Lambert Department of Health and Kinesiology Texas A&M University400 Bizzell StCollege StationTXUSA Department of Orthopedics Baylor University Medical Center3500 Gaston AveDallasTXUSA Department of Orthopedics and Sports Medicine Houston Methodist Hospital6565 Fannin StHoustonTXUSA

The purpose of this study was to develop an equation to predict strength for seven common resistance training exercises using anthropometric and demographic ***-hundred forty-seven healthy adults(74 males,73 females,3512 yr,17410 cm,8819 kg)volunteered to *** composition values(regional/total)and body dimensions were assessed using dual-energy x-ray absorptiometry(DEXA).Subjects underwent the following maximal strength assessments:Leg Press,Chest Press,Leg Curl,Lat Pulldown,Leg Extension,Tri-ceps Pushdown,and Biceps *** linear regression with stepwise removal was used to determine the best model to predict maximal strength for each *** predictor variables identified(pexercises can be reasonably estimated in adults.

关键词： Strength training exercise testing Regression equation DEXA

Assessment of autonomic nervous system activity by heart rate recovery response

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Progress in Natural Science:Materials International 2004年第5期 37-42页

作者： MENG Zhaohui and BAI Jing(Department of Biomedical Engineering, School of Medicine, Tsinghua University, Beijing 100084, China)

The assessment of autonomic nervous system (ANS) activity is a tool for diagnosing or predicting cardiovascular diseases, while heart rate recovery response ( HRRR) after exercise has been promoted as a process under the regulation of ANS (sympathetic and parasympathetic nervous systems). Therefore, assessment of ANS activity was performed by HRRR in this study. Firstly, HRRR signal was extracted based on wavelet decomposition and difference curve of coarse component from heart rate signal. Then, HRRR was divided into quickly descending interval (QDI) and slowly descending interval (SDI) . Finally, 3 groups of indexes (Difference, Exponential and Quadratic Groups) from QDI and SDI were compared between 50 normotensive and 61 hypertensive subjects. The results showed that the indexes of Difference Group were better choices than others in analyzing the features of HRRR. Furthermore, parasympathetic activity is dominant in QDI, while sympathetic and parasympathetic activities affect SDI together. In conclu

关键词： heart rate recovery exercise testing antonomic nervous system sympathetic activity parasympathetic activity.

The Current Status of Chinese Rehabilitative Cardiology

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心血管康复医学杂志 1998年第1期 2-4页

作者： LIU Jiangsheng