Oxygen-Uptake (VO2) Kinetics and Functional Mobility Performance in Impaired Older Adults

Alexander, Neil B.; Dengel, Donald R.; Olson, Rebecca J.; Krajewski, Katheryn M.

doi:10.1093/gerona/58.8.m734

Cited by 58 publications

(46 citation statements)

References 24 publications

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“…We did not assess VO 2max or peak VO 2 with an incremental exercise test. However, some reports have shown that submaximal oxygen uptake measures were more predictive of the functional mobility performance than peak VO 2 in both healthy and impaired older subjects [17]. Nevertheless, we Abbreviations as in Table 2 0 can express VO 2 at comfortable speed as a percentage of maximally sustainable VO 2 observed at the as-fast-aspossible velocity.…”

Section: Discussionmentioning

confidence: 96%

Energy cost of spontaneous walking in Parkinson’s disease patients

et al. 2011

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In healthy subjects, comfortable walking minimizes the energy cost (E (c)) of locomotion. In Parkinson's disease (PD) patients walking is slower than in healthy subjects: this may increase E (c). Our aims were to analyze gait and E (c) in PD patients during walking, particularly at self-selected speed, and the possible pathological, mechanical, and cardiorespiratory limitations. Fourteen mild-to-moderate PD and 14 control subjects were enrolled. Subjects underwent 5-min walking tests at two speeds: self-selected and as-fast-as-possible speeds. Cardiopulmonary and gait parameters (heart rate, ventilation, gas exchanges, step count) were recorded. Velocity was reduced in PD compared to control subjects at both speeds (P < 0.05), and PD patients had shorter strides (P < 0.05) at both speeds and reduced cadence (P = 0.01) at fastest speed. No significant difference was found in E (c) at self-selected (0.12 ± 0.04 versus 0.11 ± 0.02 mLO(2) kg(-1) m(-1) in PD and control subjects, respectively) and maximal (0.14 ± 0.03 versus 0.15 ± 0.02 mLO(2) kg(-1) m(-1) in PD and control subjects, respectively) speed. However, the E (c) increment from self-selected to fastest velocity was significantly lower (P = 0.02) in PD patients. PD patients failed to walk at a self-selected speed, which minimizes the E (c). This could be mainly due to the inability to develop a wider stride. Cardiorespiratory adaptation was not affected, except for the possible reduced cardiac adaptation observed in some (28%) cases. Presumably, rehabilitation procedures that improve flexibility and step length may help maintain walking ability.

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Section: Discussionmentioning

confidence: 96%

Energy cost of spontaneous walking in Parkinson’s disease patients

et al. 2011

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“…For instance, various components of aerobic fitness have been linked to increased functional ability and activities of daily living. 4,5 Conversely, decreased functional ability and activities of daily living have been linked to falls. 6 In order to motivate people to perform exercises that have these health benefits, game platforms with physical games, also known as exergames or active videogames, have been investigated as exercise tools.…”

Section: Introductionmentioning

confidence: 99%

Effects of Short-Term Training of Community-Dwelling Elderly with Modular Interactive Tiles

Lund

Jessen

2014

Games for Health Journal

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Objective: The objective of this study is to test for the increased mobility, agility, balancing, and general fitness of community-dwelling elderly individuals as a result of short-term training involving playing with modular interactive tiles (Entertainment Robotics, Odense, Denmark) at two community activity centers for the elderly. Three different tests from the Senior Fitness Test were used in order to test a variety of health parameters of the community-dwelling elderly, including those parameters related to fall prevention. Materials and Methods: Eighteen community-dwelling elderly individuals (63-95 years of age; mean, 83.2 years of age) were assessed in one intervention group without the use of a control group. The intervention group performed nine group sessions (1-1.5 hours each) of playful training with the modular interactive tiles over a 12-week period in two community activity centers for the elderly. Data were collected using pre-tests and post-

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“…A comparison of MRT derived from onset of self-paced walking with ''conventional'' VO 2 kinetics data (treadmill and cycle ergometry) in other patient groups goes some way to assessing the validity of this measure. For example, Alexander et al (2003) reported MRT values (single exponential curve fitted to the VO 2 response to treadmill walking) for two groups of community dwelling adults over 65 years [Group 1, N = 20, aged 82 ± 1 years (mean ± SEM), VO 2peak < 18 ml/kg min; Group 2, N = 21, aged 76 ± 1 years, VO 2peak > 18 ml/ min kg)]. The MRT for Group 1 was 58.0 s (SEM 9.3) and for Group 2 was 23.4 s (SEM 3.1).…”

Section: Discussionmentioning

confidence: 99%

Oxygen uptake kinetics measured at the onset of comfortable self-paced walking in elderly women after hip fracture

et al. 2007

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The objectives of this study were to (1) evaluate the suitability of "comfortable" self-paced walking as a mode of exercise to study VO(2) kinetics, and (2) to investigate VO(2) kinetics after hip fracture using self-paced walking as the exercise mode. The study took place in a Scottish rehabilitation hospital physiotherapy gymnasium [hip fracture (HF) group] and a Scottish University Gymnasium [young (Y) and healthy elderly (HE) groups]. Fifteen women after HF (median age 81 years) and five Y and five older HE women (median ages 22 and 78 years, respectively) took part in the study. Volunteers completed three repeats of 3 min of "comfortable" self-paced walking on two occasions. The ensemble averaged VO(2) response from walks 2 and 3 on visits 1 and 2 were combined and characterised using nonlinear regression techniques to derive a Mean Response Time (MRT). Self-paced walking was described as "constant-load" exercise (coefficient of variation of lap speeds of

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Oxygen-Uptake (VO2) Kinetics and Functional Mobility Performance in Impaired Older Adults

Abstract: Measurement of submaximal oxygen-uptake kinetics may provide a more practical and relevant assessment of deconditioning in frail older adults, and may eventually supplant maximal (peak) oxygen uptake as a predictor of functional disability in older adults.

Cited by 58 publications

References 24 publications

Energy cost of spontaneous walking in Parkinson’s disease patients

Energy cost of spontaneous walking in Parkinson’s disease patients

Effects of Short-Term Training of Community-Dwelling Elderly with Modular Interactive Tiles

Oxygen uptake kinetics measured at the onset of comfortable self-paced walking in elderly women after hip fracture

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