Effect of central hypervolemia on cardiac performance during exercise

Sheldahl, Lois M.; Wann, L. Samüel; Clifford, Philip S.; Tristani, Felix E.; Wolf, Lauren M.; Kalbfleisch, John H.

doi:10.1152/jappl.1984.57.6.1662

Cited by 61 publications

(65 citation statements)

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“…• O 2 is variable and depends on exercise intensity (Sheldahl et al, 1984(Sheldahl et al, , 1987Connelly et al, 1990;Cureton, 1997), exercise mode (Cureton, 1997), water depth (Gleim and Nicholas, 1989;Cureton, 1997) and water temperature (Craig and Dvorak, 1969;McArdle et al, 1976;Gleim and Nicholas, 1989;Cureton, 1997;Hall et al, 1998;Shimizu et al, 1998). In the present study, the relationship between HR and V • O 2 during waterwalking, with a water temperature of 30°C and water depth at the level of the xiphoid process, was similar to that during land-walking.…”

Section: Discussionsupporting

confidence: 67%

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Cardiorespiratory Response to Low-Intensity Walking in Water and on Land in Elderly Women.

Shono¹,

Fujishima

Hotta

et al. 2001

J. Physiol. Anthropol.

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The purpose of the present study was to determine whether or not the exercise intensity of waterwalking for elderly women could be accurately prescribed by heart rate data obtained during treadmill exercise on land. Six healthy female volunteers, with a mean age of 62.2 ± 4.2 years, took part in this study. Walking on land was performed on a treadmill. Each subject completed three consecutive 4-minute walks at a progressively increasing velocity (40, 60 and 80 m·min -1 ), with a 1-minute rest after both the first and second walks. The room temperature and relative humidity were 24.5 ± 0.2°C and 54.8 ± 4.0%, respectively. Walking in water was performed in a Flowmill, which is a treadmill positioned at the base of a water flume. Each subject completed three consecutive 4-minute walks at a progressively increasing belt and water-flow velocity (20, 30 and 40 m·min -1 ), with a 1-minute rest after both the first and second walks. The water depth was at the level of the xiphoid process of each subject. The water temperature was 30.7 ± 0.1°C. The exercise intensity at the highest workrate was equivalent to 44.2 ± 10.3% of the heart rate reserve (HRR) during water-walking and 38.4 ± 4.7% of the HRR during land-walking. There was a highly significant linear relationship between heart rate (HR) and oxygen uptake (V • O 2 ) during both water-walking and land-walking. The relationship between HR and V • O 2 in both exercise modes was similar. Thus, the relationship of HR to V• O 2 derived from a treadmill-graded walking test on land may be used to prescribe exercise intensity for waterwalking in thermoneutral water.

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Section: Discussionsupporting

confidence: 67%

“…Sheldahl et al (1984) reported that although mean heart rate in water and on land at rest and at the same level of V • O 2 during moderate exercise was similar, during heavy exercise mean HR was lower in water. The water temperature in the latter study was 31.0 ± 0.5°C.…”

Section: Discussionmentioning

confidence: 94%

Cardiorespiratory Response to Low-Intensity Walking in Water and on Land in Elderly Women.

Shono¹,

Fujishima

Hotta

et al. 2001

J. Physiol. Anthropol.

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“…Com a leitura dos trabalhos, observou-se que a mudança da posição corporal também vem sendo considerada um dos fatores que ifluenciam a variável em questão (11,17).…”

Section: Mareriais E Métodosunclassified

“…Sheldahl et al (17) não encontraram diferenças ao observar as respostas de FCr em homens nas posições de decúbito dorsal e otostática no ambiente terrestre e aquático (31 C). Kruel et al (11) analisaram as respostas da FCr de homens imersos na posição ortostática até a profundidade da cicatriz umbilical, em temperatura de 30 C, comparando com as posições decúbito dorsal e ortostática fora da água.…”

Section: Mareriais E Métodosunclassified

Comportamento da frequência cardíaca em imersão nas situações de repouso e durante exercícios de hidroginástica

Olkoski

Lopes

2013

Fisioter. mov.

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Fisioter Mov. 2013 jul/set;26(3): 689-95 ISSN 0103-5150 Fisioter. Mov., Curitiba, v. 26, n. 3, p. 689-695, jul./set. 2013 Licenciado sob uma Licença Creative Commons doi: [T] Comportamento da frequência cardíaca em imersão nas situações de repouso e durante exercícios de hidroginástica [I] Heart rate behavior in immersion in cases of rest and during water exercises Resumo Introdução: A frequência cardíaca é um parâmetro de fácil utilização para prescrição e controle da intensidade do exercício. Ao realizar um exercício no meio aquático ocorrem alterações fisiológicas significativas que devem ser compreendidas para a prescrição de exercícios, ocasionando assim os efeitos adaptativos adequados. Objetivo: Realizar uma revisão sistemática da literatura sobre o comportamento da frequência cardíaca em imersão nas situações de repouso e durante exercícios de hidroginástica e sobre os fatores que a influenciam. Resultados: Os estudos envidenciam que a frequência cardíaca pode ser influenciada pela profundidade devido ao gradiente de pressão hidrostática exercido sobre o corpo, bem como à termorregulação diferenciada. Em repouso, a frequência cardíaca pode variar de acordo com as diferentes temperaturas da água, posições corporais e profundidades. No entanto, a magnitude do efeito de cada um desses fatores sobre a frequência cardíaca ainda não é bem definido. Conclusão: Durante a realização de exercícios de hidroginástica, essa variável é proporcional à velocidade de execução do exercício, à utilização de equipamento resistivo, à área projetada e ao grupo muscular envolvido e inversamente proporcional à profundidade.[P]Palavras-chave: Frequência cardíaca. Imersão. Hidroginástica. [K]

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“…The physical properties of water change hemodynamic and metabolic responses: stroke volume increases by 30-50% and cardiac output at a given work load also increases about 25% through the Frank Starling mechanism. 15,16 From increased cardiac output as a result of increased cardiac filling pressure and lowered total peripheral resistance 17 it can be assumed that O 2 extraction in working muscles is more efficient in W than on L. However at present the effect is discussed controversial. Blood flow to oxidative muscles can also be affected if muscle pump generates a greater pressure gradient across the capillary bed and increases blood flow.…”

Section: Introductionmentioning

confidence: 99%

VO2 Kinetics during Different Forms of Cycling Exercise on Land and in Water

Fenzl¹,

Karner-Rezek²,

Schlegel³

et al. 2015

Sport Exerc Med Open J

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Background: It is generally assumed that the physical properties of water improve aerobic metabolism by O 2 utilization of the working muscle particular if a great muscle mass is recruited. This study investigated the changes in VO 2 (VO 2 -work rate relationship; ∆ VO 2 / ∆ WR) during increasing work rates in different exercise conditions in water immersed exercise and on land based exercise. Methods: In order to identify possible differences in VO 2 required for a given work rate twelve trained cyclists performed four incremental exercise tests. The tests comprised whole body work and leg work, both in water and on land and were conducted on the same, electromagnetically braked whole body ergometer. Results: The ∆ VO 2 / ∆ WR curves were found to be similar in the four exercise conditions reaching from 11.9 to 12.4 ml·W -1 during water immersed exercise and 12.6 to 12.7 ml·W -1 during land based exercise respectively. When coupling arms with leg exercise the ∆ VO 2 / ∆ WR curves shift upwards at similar work rates indicating a higher oxygen demand for an enlarged muscle mass. The extra O 2 cost ( ∆ VO 2 ) for recruited arms was lower in water immersed exercise compared to land based exercise (0.057±0.072 l ·min -1 and 0.367 1±0.057·min -1 , respectively; p=.000). Differences exist in the rate of performing physical work above ventilatory threshold two. Work load values attained on land based exercise surpass that of water immersed exercise (204.2 watts vs. 154.0 watts for whole body work and 227.1 watts vs. 150.0 watts for leg work, respectively). Conclusions: Differences in ∆ VO 2 at a given work rate are to be explained rather from a biomechanical point of view. More likely ∆ VO 2 in water seems to be influenced by both familiarity of the task and fitness level. Exercise intensity in water need to be selected at lower levels than on land.

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Effect of central hypervolemia on cardiac performance during exercise

Cited by 61 publications

References 0 publications

Cardiorespiratory Response to Low-Intensity Walking in Water and on Land in Elderly Women.

Cardiorespiratory Response to Low-Intensity Walking in Water and on Land in Elderly Women.

Comportamento da frequência cardíaca em imersão nas situações de repouso e durante exercícios de hidroginástica

VO2 Kinetics during Different Forms of Cycling Exercise on Land and in Water

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