Time-of-Day Effect on Cardiac Responses to Progressive Exercise

Rowland, Thomas W.; Unnithan, Viswanath B.; Barker, Piers; Lindley, Martin R.; Roche, Denise M.; Garrard, Max

doi:10.3109/07420528.2011.597909

Cited by 12 publications

(10 citation statements)

References 24 publications

(28 reference statements)

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“…Subjects performed 2 progressive cycle ergometer tests to exhaustion, with a 3‐day gap between test sessions. Previous work from our laboratory demonstrated no time‐of‐day effect on cardiovascular responses to cycle ergometer exercise to exhaustion in a group of adolescent males. Therefore, the subjects in this study were not tested at the same time of day on both visits.…”

Section: Methodsmentioning

confidence: 59%

Cardiac Strain during Upright Cycle Ergometry in Adolescent Males

et al. 2014

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Little evidence exists with regard to changes in cardiac strain that occur during submaximal exercise in young males. The aims of the study were to evaluate the changes that occur in longitudinal (L), radial (R) and endocardial circumferential (EC) strain during submaximal upright cycle ergometry and to examine the test-retest reproducibility of these measurements. Fourteen recreationally active, adolescent (age: 17.9 ± 0.7 years), males volunteered for the study. All subjects underwent an incremental (40W) submaximal cycle ergometer test. L, R, and EC strain values were obtained using speckle tracking, from two-dimensional B-mode images of the left ventricle (LV) during rest and the initial stages of submaximal exercise (40W and 80W). The average of 6 LV segments was used to determine both peak wall deformation (%) and the time to peak deformation (ms). There was a statistically (P<0.05) significant increase from rest to submaximal exercise for peak deformation for L, R and EC strain. There was a statistically significant (P<0.05) decrease from rest to submaximal exercise for time to peak for L and R and EC strain and between submaximal workloads for time to peak for L strain and EC strain. Coefficients of variation demonstrated reproducibility for upright strain and strain rate measurements similar to published supine measurements. This study has demonstrated that changes in left ventricular wall deformation (L, R and EC strain) that occur during the transition from rest to submaximal exercise can be reliably measured and confirm that a healthy left ventricle has a hyperdynamic response to exercise.

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Section: Methodsmentioning

confidence: 59%

Cardiac Strain during Upright Cycle Ergometry in Adolescent Males

et al. 2014

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“…By questionnaire, all were physically active but not participating in any organized sport. The subjects were participants in an earlier investigation of time‐of‐day effects on cardiac responses to exercise 6 . The resting sitting data in the present investigation are included in that report.…”

Section: Methodsmentioning

confidence: 99%

CME. Orthostatic Effects on Echocardiographic Measures of Ventricular Function

et al. 2012

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Orthostatic-induced alterations in Doppler echocardiographic measures of ventricular function have not been well-defined. Identifying such changes may provide useful insights regarding the responses of these measures to variations in ventricular loading conditions. Standard assessment of mitral inflow velocity and tissue Doppler imaging (TDI) of left ventricular longitudinal myocardial velocities was performed on 14 young males (mean age 17.9 ± 0.7 years) in the supine position and then 5 minutes after assuming a sitting position with legs dependent. Upon sitting, average values of stroke volume and cardiac output fell by 28% and 18%, respectively, while heart rate increased from 64 ± 10 to 73 ± 12 beats/min (+14%) and calculated systemic vascular resistance rose from 12.9 ± 2.2 to 16.4 ± 3.1 units (+27%). Mitral E peak velocity declined from 87 ± 16 to 64 ± 16 cm/sec, and average TDI-E' and TDI-S both decreased (by -44% and -20%, respectively). When adjusted for orthostatic decreases in left ventricular end-diastolic volume, the mean decrease in TDI-E' was reduced to -29 (P < 0.01), but no significant decline was observed in adjusted TDI-S. Average E/E' rose with sitting by 40% (P = 0.02). These findings suggest that (a) decreases in TDI measures when assuming the upright position reflect the reduction of left ventricular size; (b) orthostatic fall in TDI-E' is also related to smaller ventricular size but, in addition, to a nonspecified reduction in ventricular relaxation; and (c) values of E/E' do not reflect alterations in ventricular preload, which occur during an orthostatic challenge.

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“…This reflection is strongly associated with time-dependent exercise 4, 5. Recent studies have attempted to elucidate the manner in which different exercise types and duration are involved in the regulation of several physiological responses through morning and evening exercise because this information is important in improving muscle fitness, aerobic capacity, and well-being 5, 6, 7, 8…”

Section: Introductionmentioning

confidence: 99%

Morning and evening exercise

Seo

Lee

Kim

et al. 2013

Integrative Medicine Research

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A growing body of evidence suggests that exercise may contribute to preventing pathological changes, treating multiple chronic diseases, and reducing mortality and morbidity ratios. Scientific evidence moreover shows that exercise plays a key role in improving health-related physical fitness components and hormone function. Regular exercise training is one of the few strategies that has been strictly adapted in healthy individuals and in athletes. However, time-dependent exercise has different outcomes, based on the exercise type, duration, and hormone adaptation. In the present review, we therefore briefly describe the type, duration, and adaptation of exercise performed in the morning and evening. In addition, we discuss the clinical considerations and indications for exercise training.

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Time-of-Day Effect on Cardiac Responses to Progressive Exercise

Cited by 12 publications

References 24 publications

Cardiac Strain during Upright Cycle Ergometry in Adolescent Males

Cardiac Strain during Upright Cycle Ergometry in Adolescent Males

CME. Orthostatic Effects on Echocardiographic Measures of Ventricular Function

Morning and evening exercise

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