Cardiac autonomic modulation during progressive upper limb exercise by patients with coronary artery disease

Machado, Heloisa Giangrossi; Simões, Rodrigo Polaquini; Mendes, Renata Gonçalves; Castello, Viviane; Thommazo, Luciana Di; Almeida, Larissa Brentini de; Lopes, Sérgio Luiz Brasileiro; Catai, Aparecida Maria; Borghi‐Silva, Audrey

doi:10.1590/s0100-879x2011007500134

Cited by 8 publications

(11 citation statements)

References 29 publications

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“…Heinze et al found that Mean‐RR, pNN50, and SD1 have no significant relationship with operator fatigue, while Cinaz et al found that pNN50 decreases significantly under mental workload . In our study, we found results that are consistent with experiments that link a decrease in Mean‐RR with both operator fatigue and mental workload and a decrease in SD1 with operator fatigue and that correlate a pNN50 decrease with operator fatigue and a pNN50 increase with mental workload …”

Section: Analysis and Discussionsupporting

confidence: 90%

“…Previous research also shows that Mean‐RR has a consistent decrease under mental workload, whereas pNN50 increased under heavier mental workload condition . Some previous studies also show that there is a decrease of SD1 when human do physical exercise . In our experiment, it can be seen that subjects suffer from operator fatigue and mental workload during the virtual magic cube task given the significant decrease of the Mean‐RR indicator in nearly all the sessions following session 1 (with the exception of session 6).…”

Section: Analysis and Discussionsupporting

confidence: 72%

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A study on differences in human perception between a real and an AR scene viewed in an OST‐HMD

et al. 2019

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With the recent growth in the development of augmented reality (AR) technologies, it is becoming important to study human perception of AR scenes. In order to detect whether users will suffer more from visual and operator fatigue when watching virtual objects through optical see‐through head‐mounted displays (OST‐HMDs), compared with watching real objects in the real world, we propose a comparative experiment including a virtual magic cube task and a real magic cube task. The scores of the subjective questionnaires (SQ) and the values of the critical flicker frequency (CFF) were obtained from 18 participants. In our study, we use several electrooculogram (EOG) and heart rate variability (HRV) measures as objective indicators of visual and operator fatigue. Statistical analyses were performed to deal with the subjective and objective indicators in the two tasks. Our results suggest that participants were very likely to suffer more from visual and operator fatigue when watching virtual objects presented by the OST‐HMD. In addition, the present study provides hints that HRV and EOG measures could be used to explore how visual and operator fatigue are induced by AR content. Finally, three novel HRV measures are proposed to be used as potential indicators of operator fatigue.

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Section: Analysis and Discussionsupporting

confidence: 90%

Section: Analysis and Discussionsupporting

confidence: 72%

A study on differences in human perception between a real and an AR scene viewed in an OST‐HMD

et al. 2019

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“…Before the execution of the test, subjects were oriented to avoid isometric contraction and exhale during the extension of the knees and hips to avoid the Valsalva maneuver (26). The resistance load for 1-RM was estimated (1-RM-E) before the test by multiplying the volunteer's body weight by 4, based on a previous study (11 ).…”

Section: Methodsmentioning

confidence: 99%

Ultra-short-term heart rate variability during resistance exercise in the elderly

Arêas

Caruso

Simões

et al. 2018

Braz J Med Biol Res

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Despite the appeal of ultra-short-term heart rate variability (HRV) methods of analysis applied in the clinical and research settings, the number of studies that have investigated HRV by analyzing R-R interval (RRi) recordings shorter than 5 min is still limited. Moreover, ultra-short-term HRV analysis has not been extensively validated during exercise and, currently, no indications exist for its applicability during resistance exercise. The aim of the present study was to compare ultra-short-term HRV analysis with standard short-term HRV analysis during low-intensity, dynamic, lower limb resistance exercise in healthy elderly subjects. Heart rate (HR) and RRi signals were collected from 9 healthy elderly men during discontinuous incremental resistance exercise consisting of 4-min intervals at low intensities (10, 20, 30, and 35% of 1-repetition maximum). The original RRi signals were segmented into 1-, 2-, and 3-min sections. HRV was analyzed in the time domain (root mean square of the of differences between adjacent RRi, divided by the number of RRi, minus one [RMSSD]), RRi mean value and standard deviation [SDNN] (percentage of differences between adjacent NN intervals that are greater than 50 ms [pNN50]), and by non-linear analysis (short-term RRi standard deviation [SD1] and long-term RRi standard deviation [SD2]). No significant difference was found at any exercise intensity between the results of ultra-short-term HRV analysis and the results of standard short-term HRV analysis. Furthermore, we observed excellent (0.70 to 0.89) to near-perfect (0.90 to 1.00) concordance between linear and non-linear parameters calculated over 1- and 2-min signal sections and parameters calculated over 3-min signal sections. Ultra-short-term HRV analysis appears to be a reliable surrogate of standard short-term HRV analysis during resistance exercise in healthy elderly subjects.

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“…The effect of chronic exercise training in decreasing infarct size seems to occur, at least in part, through the opioid receptor stimulus, and not by increasing myocardial perfusion. Machado et al [30] investigated the behavior of heart rate and heart rate variability during different loads of resistance exercise (incline bench press) in ten patients with coronary artery disease vs. ten healthy sedentary controls and conclude that loads up to 30% one-repetitionmaximum during incline bench press, result in depressed vagal modulation in both groups, although only the coronary artery disease patients presented sympathetic overactivity at 20% one-repetition-maximum upper limb exercise. Kanegusuku et al [31] determined in 30 older adults whether different resistance training regimens, strength training (constant movement velocity) or power training (concentric phase performed as fast as possible) can blunt the increase in cardiovascular load during an aerobic stimulus and conclude that neither strength nor power training blunted submaximal or maximal heart rate, Systolic blood pressure or the rate-pressure product during the maximal exercise test, showing that they did not reduce cardiovascular stress during aerobic tasks.…”

Section: Kk and Rocha E Silva M -Cardiology In Brazilian Scientific Joumentioning

confidence: 99%

Cardiology in Brazilian scientific journals: an overview

Patel

Silva

2012

Rev Bras Cir Cardiovasc

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Cardiology has been and is a very significant fraction of the Brazilian contribution to science. In older days, the most significant part of this work was directed to foreign periodicals, but the quasi-simultaneous emergence of SciELO and PUBMED has ordained a redirection of much of this work to Brazilian periodicals. We here survey some of this more recent contribution for the benefit of readers of Revista Brasileira de Cirurgia Cardiovascular. This is offered as an update. Articles on the general themes of Cardiology and Pneumology published by four ISI Indexed Brazilian journals not specializing in cardiology are re-visited, after a search through 10 journals. ResumoA Cardiologia foi, e continua sendo, responsável por uma fracção muito significativa da contribuição brasileira para a ciência. No passado, os trabalhos mais importantes eram direcionados para periódicos estrangeiros, mas o surgimento quase simultâneo do SciELO e PUBMED facilitou um redirecionamento de grande parte desses trabalhos a periódicos brasileiros. Neste artigo, examinamos algumas das contribuições mais recentes em benefício aos leitores da Revista Brasileira de Cirurgia Cardiovascular. Esta discussão é oferecida como uma atualização. Artigos sobre os temas gerais da cardiologia e pneumologia publicados por quatro revistas brasileiras indexadas no ISI -não especializadas em cardiologia -são revistos.RBCCV

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Cardiac autonomic modulation during progressive upper limb exercise by patients with coronary artery disease

Cited by 8 publications

References 29 publications

A study on differences in human perception between a real and an AR scene viewed in an OST‐HMD

A study on differences in human perception between a real and an AR scene viewed in an OST‐HMD

Ultra-short-term heart rate variability during resistance exercise in the elderly

Cardiology in Brazilian scientific journals: an overview

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