Effects of Menstrual Cycle Phase and Oral Contraceptives on Muscular Strength, Endurance, and Flexibility

Hinnerichs, Kristi R.; Conley, Donovan S.; Evetovich, Tammy K.; Engebretsen, Barbara J.; Todd, Jay B.

doi:10.1097/00005768-200405001-00166

Cited by 5 publications

(6 citation statements)

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“…These findings disagree with the study by Hinnerichs et al (19) . This investigation did not show significant differences in the muscular force, resistance and flexibility, in physically active adult young women, in the MC phases, when the same comparison with the use of oral contraceptives was made.…”

Section: Discussioncontrasting

confidence: 99%

A influência do ciclo menstrual na flexibilidade em praticantes de ginástica de academia

Melegario

Simão

Vale

et al. 2006

Rev Bras Med Esporte

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Este estudo teve por objetivo investigar se existem diferenças no grau de flexibilidade nas fases do ciclo menstrual de mulheres adultas jovens praticantes de ginástica de academia. A amostra intencional foi composta de 20 mulheres, com idade de 18 a 35 anos (25,8 ± 6,06), com o ciclo menstrual regular (28 até 32 dias) e que não faziam uso de anticoncepcional oral. Dados referentes ao ciclo menstrual e atividade física habitual foram obtidos através da aplicação de um questionário. A flexibilidade foi aferida através da goniometria, utilizando-se oito movimentos, em três fases do ciclo menstrual. Os sujeitos foram submetidos a um teste hormonal, em que foram verificadas as taxas de estrona, estradiol e progesterona. O tratamento estatístico foi feito através de análise descritiva e inferencial (teste de Kolmogorov-Smirnov e ANOVA). Os resultados encontrados demonstraram que não houve diferença significativa (p < 0,05) no grau de flexibilidade do grupo estudado, durante as fases folicular, ovulatória e lútea do ciclo menstrual.

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Section: Discussioncontrasting

confidence: 99%

A influência do ciclo menstrual na flexibilidade em praticantes de ginástica de academia

Melegario

Simão

Vale

et al. 2006

Rev Bras Med Esporte

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show abstract

“…Estudos reportam que as alterações nas concentrações séricas de estrogênio/progesterona não são suficientes para afetar o desempenho físico (FRIDEN et al, 2003;HINNERICHS et al, 2004). Contudo, os sintomas pré-menstruais ou dismenorréia, exercem um efeito negativo no desempenho de algumas mulheres, podendo haver variações individuais (GIACOMONI et al, 1999).…”

Section: Resultsunclassified

“…Outros estudos abordam a influência do ciclo menstrual sobre a flexibilidade, com relação às alterações hormonais, mas não demonstraram haver variação da flexibilidade ao longo do ciclo (CHAVES et al, 2002;HINNERICHS et al 2004). …”

Section: Materiais E Métodosunclassified

Efeito das Diferentes Fases do Ciclo Menstrual em um Teste de 10 RM

Dias¹,

Simão²

2005

Fit Per J

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“…Mechanical deformation (Wan et al, 2008) and exposure to reduced O 2 tension (Ellsworth et al, 2009), both of which occur in small skeletal muscle microvessels, stimulate erythrocyte ATP release. Such a mechanism provides a means by which the distribution of perfusion can be regulated dynamically (Ellsworth, 2000, 2004; Ellsworth et al, 2009; Pittman, 2010). Extensive experimental evidence has established that ATP release from erythrocytes varies in response to changes in the levels of O 2 tension to which these cells are exposed (Ellsworth et al, 1995; Jagger et al, 2001) and that increases in microvascular ATP concentrations result in vasodilation that is conducted to the feed arterioles, promoting an increase in oxygen supply to downstream tissues (McCullough et al, 1997; Collins et al, 1998; Ellsworth, 2000).…”

Section: Discussionmentioning

confidence: 99%

“…Several recent reviews (Ellsworth, 2000, 2004; Gonzalez-Alonso, 2008; Ellsworth et al, 2009; Sprague et al, 2011) and previous theoretical models (Arciero et al, 2008; Sprague et al, 2010) have evaluated the impact of erythrocyte-released ATP on microvascular flow regulation. However, a full understanding of the effect of erythrocyte-derived ATP on the regulation of O 2 delivery requires quantification of the interacting physiological processes over a wide range of physical length scales.…”

Section: Introductionmentioning

confidence: 99%

Toward a Multiscale Description of Microvascular Flow Regulation: O2-Dependent Release of ATP from Human Erythrocytes and the Distribution of ATP in Capillary Networks

Goldman¹,

Fraser²,

Ellis³

et al. 2012

Front. Physio.

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Integration of the numerous mechanisms that have been suggested to contribute to optimization of O2 supply to meet O2 need in skeletal muscle requires a systems biology approach which permits quantification of these physiological processes over a wide range of length scales. Here we describe two individual computational models based on in vivo and in vitro studies which, when incorporated into a single robust multiscale model, will provide information on the role of erythrocyte-released ATP in perfusion distribution in skeletal muscle under both physiological and pathophysiological conditions. Healthy human erythrocytes exposed to low O2 tension release ATP via a well characterized signaling pathway requiring activation of the G-protein, Gi, and adenylyl cyclase leading to increases in cAMP. This cAMP then activates PKA and subsequently CFTR culminating in ATP release via pannexin 1. A critical control point in this pathway is the level of cAMP which is regulated by pathway-specific phosphodiesterases. Using time constants (~100 ms) that are consistent with measured erythrocyte ATP release, we have constructed a dynamic model of this pathway. The model predicts levels of ATP release consistent with measurements obtained over a wide range of hemoglobin O2 saturations (sO2). The model further predicts how insulin, at concentrations found in pre-diabetes, enhances the activity of PDE3 and reduces intracellular cAMP levels leading to decreased low O2-induced ATP release from erythrocytes. The second model, which couples O2 and ATP transport in capillary networks, shows how intravascular ATP and the resulting conducted vasodilation are affected by local sO2, convection and ATP degradation. This model also predicts network-level effects of decreased ATP release resulting from elevated insulin levels. Taken together, these models lay the groundwork for investigating the systems biology of the regulation of microvascular perfusion distribution by erythrocyte-derived ATP.

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Effects of Menstrual Cycle Phase and Oral Contraceptives on Muscular Strength, Endurance, and Flexibility

Cited by 5 publications

References 0 publications

A influência do ciclo menstrual na flexibilidade em praticantes de ginástica de academia

A influência do ciclo menstrual na flexibilidade em praticantes de ginástica de academia

Efeito das Diferentes Fases do Ciclo Menstrual em um Teste de 10 RM

Toward a Multiscale Description of Microvascular Flow Regulation: O2-Dependent Release of ATP from Human Erythrocytes and the Distribution of ATP in Capillary Networks

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