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Postural Change and Active Propulsio...

Murphy, Eryn.

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Postural Change and Active Propulsion: Implications for Cardio-Postural Control in Older Adults.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Postural Change and Active Propulsion: Implications for Cardio-Postural Control in Older Adults./
作者:	Murphy, Eryn.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2020,
面頁冊數:	103 p.
附註:	Source: Dissertations Abstracts International, Volume: 81-12, Section: B.
Contained By:	Dissertations Abstracts International81-12B.
標題:	Biomechanics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27833404
ISBN:	9798645471804

Postural Change and Active Propulsion: Implications for Cardio-Postural Control in Older Adults.
Murphy, Eryn.

Postural Change and Active Propulsion: Implications for Cardio-Postural Control in Older Adults. - Ann Arbor : ProQuest Dissertations & Theses, 2020 - 103 p.

Source: Dissertations Abstracts International, Volume: 81-12, Section: B.

Thesis (Ph.D.)--New Mexico State University, 2020.

This item must not be sold to any third party vendors.

One of the greatest threats to an aging society is the risk of falling. Aging results in multiple changes in physiological systems, including the cardiovascular and musculoskeletal systems, resulting in increased risk of falling through numerous pathways, including the hypothesized cardio-postural control loop. The relationship between these systems as they relate to physical function and risk of falling is largely unknown. Purpose. The purpose of this study is to investigate the relationship between the cardiovascular system and musculoskeletal system by understanding the extent to which an acute drop in blood pressure impacts postural control. Secondarily, I aim to understand the effects of postural change on physical function, as it relates to varied hemodynamic responses. Methods. 42 participants, age 73.2 + 6.2 years, were recruited from a local Tai Chi course. Participants were asked to perform testing on two days, one week apart. Gait characteristics were collected during a 3-m Timed Up and Go, and postural sway data were collected during a 30-second quiet standing task (COPT), both testing parameters were collected after at least 10 minutes of seated and supine rest. Blood pressure was collected during resting procedures and again upon standing during the balance testing. Resulting delta values were reported and analyzed using intraclass correlations, Pearson correlations and dependent t-tests as appropriate. Results. Intraclass correlations for hemodynamic change variables (∆SBP, ∆DBP, ∆MAP, and ∆HR) ranged from 0.129-0.457 under the seated conditions, and 0.191 and 0.63 in the supine conditions. ICC of COPT ranged from -0.190-0.837 across all conditions and variables. ICC of the gait characteristics ranged from 0.378 to 0.950. There was a significant difference in ∆HR after supine rest compared to seated rest (11.33 ± 8.21 and 4.72 ± 6.83 bpm respectively, p<0.05). There was a significant difference in COPT20 after supine rest compared to seated rest (41.25 ± 13.85 and 37.10 ± 11.97 mm, p<0.05). There were significant differences across all gait features after supine rest compared to seated rest. TUG time to completion increased after supine rest compared to seated (11.92 ± 0.66 and 10.28 ± 0.41 seconds respectively, p<0.01). Gait velocity was significantly slower after supine rest compared to seated rest (88.79 ± 4.74 and 103.7 ± 3.55 cm/s respectively, p<0.05). Cadence significantly decreased after supine rest compared to seated rest (109.89 ± 3.45 and 120.92 ±2.59 respectively, p<0.05). Percent of gait cycle in Active propulsion decreased after supine rest compared to seated rest (56.87 ± 4.76 and 70.79 ± 4.05% respectively, p<0.001). Conclusion. Unique findings of this study include the correlations between postural sway and change in heart rate, as well as the significant effect of resting posture on physical function, namely gait characteristics, TUG performance and balance. Our results indicate that resting in a supine position and standing quickly alters physical function in such a way that increases the risk of falling and is consistent with the cardio-postural control loop hypothesis. These findings are especially useful to clinicians, as physical function assessments are typically performed from a seated position, which may not elicit changes in function like supine rest does.

ISBN: 9798645471804Subjects--Topical Terms:

548685
Biomechanics.
Subjects--Index Terms:

Aging

Postural Change and Active Propulsion: Implications for Cardio-Postural Control in Older Adults.
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500 $a Source: Dissertations Abstracts International, Volume: 81-12, Section: B.
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520 $a One of the greatest threats to an aging society is the risk of falling. Aging results in multiple changes in physiological systems, including the cardiovascular and musculoskeletal systems, resulting in increased risk of falling through numerous pathways, including the hypothesized cardio-postural control loop. The relationship between these systems as they relate to physical function and risk of falling is largely unknown. Purpose. The purpose of this study is to investigate the relationship between the cardiovascular system and musculoskeletal system by understanding the extent to which an acute drop in blood pressure impacts postural control. Secondarily, I aim to understand the effects of postural change on physical function, as it relates to varied hemodynamic responses. Methods. 42 participants, age 73.2 + 6.2 years, were recruited from a local Tai Chi course. Participants were asked to perform testing on two days, one week apart. Gait characteristics were collected during a 3-m Timed Up and Go, and postural sway data were collected during a 30-second quiet standing task (COPT), both testing parameters were collected after at least 10 minutes of seated and supine rest. Blood pressure was collected during resting procedures and again upon standing during the balance testing. Resulting delta values were reported and analyzed using intraclass correlations, Pearson correlations and dependent t-tests as appropriate. Results. Intraclass correlations for hemodynamic change variables (∆SBP, ∆DBP, ∆MAP, and ∆HR) ranged from 0.129-0.457 under the seated conditions, and 0.191 and 0.63 in the supine conditions. ICC of COPT ranged from -0.190-0.837 across all conditions and variables. ICC of the gait characteristics ranged from 0.378 to 0.950. There was a significant difference in ∆HR after supine rest compared to seated rest (11.33 ± 8.21 and 4.72 ± 6.83 bpm respectively, p<0.05). There was a significant difference in COPT20 after supine rest compared to seated rest (41.25 ± 13.85 and 37.10 ± 11.97 mm, p<0.05). There were significant differences across all gait features after supine rest compared to seated rest. TUG time to completion increased after supine rest compared to seated (11.92 ± 0.66 and 10.28 ± 0.41 seconds respectively, p<0.01). Gait velocity was significantly slower after supine rest compared to seated rest (88.79 ± 4.74 and 103.7 ± 3.55 cm/s respectively, p<0.05). Cadence significantly decreased after supine rest compared to seated rest (109.89 ± 3.45 and 120.92 ±2.59 respectively, p<0.05). Percent of gait cycle in Active propulsion decreased after supine rest compared to seated rest (56.87 ± 4.76 and 70.79 ± 4.05% respectively, p<0.001). Conclusion. Unique findings of this study include the correlations between postural sway and change in heart rate, as well as the significant effect of resting posture on physical function, namely gait characteristics, TUG performance and balance. Our results indicate that resting in a supine position and standing quickly alters physical function in such a way that increases the risk of falling and is consistent with the cardio-postural control loop hypothesis. These findings are especially useful to clinicians, as physical function assessments are typically performed from a seated position, which may not elicit changes in function like supine rest does.
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