Left ventricular twist mechanics during incremental cycling and knee extension exercise in healthy men

2.50
Hdl Handle:
http://hdl.handle.net/10547/622075
Title:
Left ventricular twist mechanics during incremental cycling and knee extension exercise in healthy men
Authors:
Beaumont, Alexander; Hough, John; Sculthorpe, Nicholas ( 0000-0001-8235-8580 ) ; Richards, Joanna C.
Abstract:
Purpose: The objective of the present study was to investigate left ventricular (LV) twist mechanics in response to incremental cycling and isometric knee extension exercises. Methods: Twenty-six healthy male participants (age = 30.42 ± 6.17 years) were used to study peak twist mechanics at rest and during incremental semi-supine cycling at 30 and 60% work rate maximum (W) and during short duration (15 s contractions) isometric knee extension at 40 and 75% maximum voluntary contraction (MVC), using two-dimensional speckle tracking echocardiography. Results: Data presented as mean ± standard deviation or median (interquartile range). LV twist increased from rest to 30% W (13.21° ± 4.63° to 20.04° ± 4.76°, p < 0.001) then remained unchanged. LV systolic and diastolic twisting velocities progressively increased with exercise intensity during cycling from rest to 60% W (twisting, 88.21° ± 20.51° to 209.05° ± 34.56° s, p < 0.0001; untwisting, −93.90 (29.62)° to −267.31 (104.30)° s, p < 0.0001). During the knee extension exercise, LV twist remained unchanged with progressive intensity (rest 13.40° ± 4.80° to 75% MVC 16.77° ± 5.54°, p > 0.05), whilst twisting velocity increased (rest 89.15° ± 21.77° s to 75% MVC 124.32° ± 34.89° s, p < 0.01). Untwisting velocity remained unchanged from rest [−90.60 (27.19)° s] to 40% MVC (p > 0.05) then increased from 40 to 75% MVC [−98.44 (43.54)° s to −138.42 (73.29)° s, p < 0.01]. Apical rotations and rotational velocities were greater than basal during all conditions and intensities (all p < 0.01). Conclusion: Cycling increased LV twist to 30% W which then remained unchanged thereafter, whereas twisting velocities showed further increases to greater intensities. A novel finding is that LV twist was unaffected by incremental knee extension, yet systolic and diastolic twisting velocities augmented with isometric exercise.
Citation:
Beaumont A., Hough J., Sculthorpe N., Richards J. (2017) 'Left ventricular twist mechanics during incremental cycling and knee extension exercise in healthy men', European Journal of Applied Physiology, 117 (1), pp.139-150.
Publisher:
Springer Verlag
Journal:
European Journal of Applied Physiology
Issue Date:
5-Dec-2016
URI:
http://hdl.handle.net/10547/622075
DOI:
10.1007/s00421-016-3506-8
Additional Links:
https://link.springer.com/article/10.1007%2Fs00421-016-3506-8
Type:
Article
Language:
en
ISSN:
1439-6319
Appears in Collections:
Sport and physical activity

Full metadata record

DC FieldValue Language
dc.contributor.authorBeaumont, Alexanderen
dc.contributor.authorHough, Johnen
dc.contributor.authorSculthorpe, Nicholasen
dc.contributor.authorRichards, Joanna C.en
dc.date.accessioned2017-04-11T14:08:21Z-
dc.date.available2017-04-11T14:08:21Z-
dc.date.issued2016-12-05-
dc.identifier.citationBeaumont A., Hough J., Sculthorpe N., Richards J. (2017) 'Left ventricular twist mechanics during incremental cycling and knee extension exercise in healthy men', European Journal of Applied Physiology, 117 (1), pp.139-150.en
dc.identifier.issn1439-6319-
dc.identifier.doi10.1007/s00421-016-3506-8-
dc.identifier.urihttp://hdl.handle.net/10547/622075-
dc.description.abstractPurpose: The objective of the present study was to investigate left ventricular (LV) twist mechanics in response to incremental cycling and isometric knee extension exercises. Methods: Twenty-six healthy male participants (age = 30.42 ± 6.17 years) were used to study peak twist mechanics at rest and during incremental semi-supine cycling at 30 and 60% work rate maximum (W) and during short duration (15 s contractions) isometric knee extension at 40 and 75% maximum voluntary contraction (MVC), using two-dimensional speckle tracking echocardiography. Results: Data presented as mean ± standard deviation or median (interquartile range). LV twist increased from rest to 30% W (13.21° ± 4.63° to 20.04° ± 4.76°, p < 0.001) then remained unchanged. LV systolic and diastolic twisting velocities progressively increased with exercise intensity during cycling from rest to 60% W (twisting, 88.21° ± 20.51° to 209.05° ± 34.56° s, p < 0.0001; untwisting, −93.90 (29.62)° to −267.31 (104.30)° s, p < 0.0001). During the knee extension exercise, LV twist remained unchanged with progressive intensity (rest 13.40° ± 4.80° to 75% MVC 16.77° ± 5.54°, p > 0.05), whilst twisting velocity increased (rest 89.15° ± 21.77° s to 75% MVC 124.32° ± 34.89° s, p < 0.01). Untwisting velocity remained unchanged from rest [−90.60 (27.19)° s] to 40% MVC (p > 0.05) then increased from 40 to 75% MVC [−98.44 (43.54)° s to −138.42 (73.29)° s, p < 0.01]. Apical rotations and rotational velocities were greater than basal during all conditions and intensities (all p < 0.01). Conclusion: Cycling increased LV twist to 30% W which then remained unchanged thereafter, whereas twisting velocities showed further increases to greater intensities. A novel finding is that LV twist was unaffected by incremental knee extension, yet systolic and diastolic twisting velocities augmented with isometric exercise.en
dc.language.isoenen
dc.publisherSpringer Verlagen
dc.relation.urlhttps://link.springer.com/article/10.1007%2Fs00421-016-3506-8-
dc.rightsGreen - can archive pre-print and post-print or publisher's version/PDF-
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.subjectrotationen
dc.subjectleft ventricleen
dc.subjectspeckle tracking echocardiographyen
dc.subjectexerciseen
dc.subjectC600 Sports Scienceen
dc.titleLeft ventricular twist mechanics during incremental cycling and knee extension exercise in healthy menen
dc.typeArticleen
dc.identifier.journalEuropean Journal of Applied Physiologyen
dc.date.updated2017-04-11T13:47:46Z-
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