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Parrino RL, Martinez KJ, Konlian JA, Conti JM, Signorile JF. Leg Press and Chest Press Power Normative Values by Half Decade in Older Women. J Strength Cond Res 2024; 38:991-998. [PMID: 38241469 DOI: 10.1519/jsc.0000000000004704] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2024]
Abstract
ABSTRACT Parrino, RL, Martinez, KJ, Konlian, JA, Conti, JM, and Signorile, JF. Leg press and chest press power normative values by half decade in older women. J Strength Cond Res 38(5): 991-998, 2024-Neuromuscular power is essential for the performance of most activities of daily living and the maintenance of functional independence throughout the aging process. Power declines rapidly in later life; however, this decline may be reduced or delayed with early detection and intervention. Therefore, this study provides leg press and chest press power normative values for older women. Women's power data for this analysis included 229 participants, 60-90 years of age. Power testing was conducted on Keiser A420 pneumatic leg press and chest press machines following a standardized protocol. Data were stratified into half-decade age groups and analyzed using a 1-way ANOVA. Descriptive statistics and quartile rankings are reported, and significant differences between age groups are outlined. There were significant differences in absolute and relative leg press peak power between the age groups ( p < 0.05). However, there were no significant differences in absolute or relative chest press peak power between the age groups. This research established normative values and quartile rankings for leg press and chest press power in older women 60-90 years of age, allowing comparative evaluations with patients and subjects by clinicians and researchers, respectively. These values should improve exercise interventions designed to improve power production by providing assessments of subjects' current status and allowing comprehensive monitoring of progress.
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Affiliation(s)
- Rosalia L Parrino
- Department of Kinesiology and Sports Sciences, Laboratory of Neuromuscular Research and Active Aging, University of Miami, Coral Gables, Florida
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Jiménez-Lupión D, Chirosa-Ríos L, Martínez-García D, Rodríguez-Pérez M, Jerez-Mayorga D. Effects of Power Training on Functional Capacity Related to Fall Risk in Older Adults: A Systematic Review and Meta-analysis. Arch Phys Med Rehabil 2023; 104:1514-1525. [PMID: 36868491 DOI: 10.1016/j.apmr.2023.01.022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2022] [Revised: 01/12/2023] [Accepted: 01/27/2023] [Indexed: 03/05/2023]
Abstract
OBJECTIVE Functional capacity is 1 of the main risk factors for falls among older adults. The aim of this systematic review and meta-analysis was to determine the effect of power training on functional capacity test (FCT) related to fall risk in older adults. DATA SOURCES Systematic searches were conducted in 4 databases, including PubMed, Web of Science, Scopus, and SPORTDiscus, from inception to November 2021. STUDY SELECTION Randomized controlled trials (RCTs) assessing the effect of power training on functional capacity compared with another type of training program or control group in older adults with the ability to exercise independently. DATA EXTRACTION Two independent researchers evaluated eligibility and used the PEDro scale to assess risk of bias. The information extracted was related to article identification (authors, country and year of publication), participant characteristics (sample, sex, and age), strength training protocols (exercises/intensity/weeks), and the outcome of the FCT used related to fall risk. The Cochran Q statistic and I2 statistics was used to assess heterogeneity. Random-effects model were conducted to pool the effect sizes expressed as mean differences (MD). DATA SYNTHESIS Twelve studies (478 subjects) were selected for systematic review. A meta-analysis comprised 6 studies (217 subjects) where the outcome measure was the 30-second Sit to Stand (30s-STS) test, and another comprised 4 studies (142 subjects) where the outcome measure was the timed Up and Go (TUG) test. There was an improvement in performance in favor of the experimental group in both the TUG subgroup (MD -0.31 s; 95% CI -0.63, 0.00 s; P=.05), and the 30s-STS subgroup (MD 1.71 reps; 95% CI -0.26, 3.67 reps; P=.09). CONCLUSIONS In conclusion, power training increases functional capacity related to fall risk further than other types of exercise in older adults.
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Affiliation(s)
- Daniel Jiménez-Lupión
- Department of Physical Education and Sports, Faculty of Sport Sciences, University of Granada, Granada, Spain
| | - Luis Chirosa-Ríos
- Department of Physical Education and Sports, Faculty of Sport Sciences, University of Granada, Granada, Spain
| | - Darío Martínez-García
- Department of Physical Education and Sports, Faculty of Sport Sciences, University of Granada, Granada, Spain
| | - Manuel Rodríguez-Pérez
- Department of Education, Faculty of Education Sciences, University of Almería, Almería, Spain; SPORT Research Group (CTS-1024), CERNEP Research Center, University of Almería, Almería, Spain
| | - Daniel Jerez-Mayorga
- Department of Physical Education and Sports, Faculty of Sport Sciences, University of Granada, Granada, Spain; Exercise and Rehabilitation Sciences Laboratory, School of Physical Therapy, Faculty of Rehabilitation Sciences, Universidad Andres Bello, Santiago, Chile.
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Valenzuela T, Coombes JS, Liu-Ambrose T, Mavros Y, Kochan N, Sachdev PS, Hausdorff J, Smith EC, Hollings M, Hawkins TC, Ashley NJ, Feter N, Wilson GC, Shih IHE, Guerrero Y, Jiang J, Wen W, Bailey T, Stensvold D, Wisløff U, Falck RS, Fiatarone Singh M. Study protocol for the BRAIN Training Trial: a randomised controlled trial of Balance, Resistance, And INterval training on cognitive function in older adults with mild cognitive impairment. BMJ Open 2022; 12:e062059. [PMID: 36600421 PMCID: PMC9772642 DOI: 10.1136/bmjopen-2022-062059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
INTRODUCTION Epidemiological evidence suggests that both poor cardiovascular fitness and low muscle mass or strength markedly increase the rate of cognitive decline and incident dementia in older adults. Results from exercise trials for the improvement of cognition in older adults with mild cognitive impairment (MCI) have reported mixed results. This is possibly due to insufficient exercise intensities. The aim of the Balance, Resistance, And INterval (BRAIN) Training Trial is to determine the effects of two forms of exercise, high-intensity aerobic interval training (HIIT) and high-intensity power training (POWER) each compared with a sham exercise control group on cognition in older adults with MCI. METHODS AND ANALYSIS One hundred and sixty community-dwelling older (≥ 60 years) people with MCI have been randomised into the trial. Interventions are delivered supervised 2-3 days per week for 12 months. The primary outcome measured at baseline, 6 and 12 months is performance on a cognitive composite score measuring the executive domain calculated from a combination of computerised (NeuroTrax) and paper-and-pencil tests. Analyses will be performed via repeated measures linear mixed models and generalised linear mixed models of baseline, 6-month and 12-month time points, adjusted for baseline values and covariates selected a priori. Mixed models will be constructed to determine the interaction of GROUP × TIME. ETHICS AND DISSEMINATION Ethical approval was obtained from the University of Sydney (HREC Ref.2017/368), University of Queensland (HREC Ref. 2017/HE000853), University of British Columbia (H16-03309), and Vancouver Coastal Health Research Institute (V16-03309) Human Research Ethics. Dissemination will be via publications, conference presentations, newsletter articles, social media, talks to clinicians and consumers and meetings with health departments/managers.It is expected that communication of results will allow for the development of more effective evidence-based exercise prescription guidelines in this population while investigating the benefits of HIIT and POWER on subclinical markers of disease. TRIAL REGISTRATION NUMBER ACTRN12617001440314 Australian New Zealand Clinical Trials Registry.
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Affiliation(s)
- Trinidad Valenzuela
- Sydney School of Health Sciences, Faculty of Medicine and Health, The University of Sydney, Sydney, New South Wales, Australia
- Exercise and Rehabilitation Sciences Laboratory, School of Physical Therapy, Faculty of Rehabilitation Sciences, Universidad Andres Bello, Santiago, Chile
| | - Jeff S Coombes
- Human Movement and Nutrition Sciences, Faculty of Health and Behavioural Sciences, The University of Queensland, Herston, Queensland, Australia
| | - Teresa Liu-Ambrose
- Aging, Mobility, and Cognitive Neuroscience Laboratory, Department of Physical Therapy, Faculty of Medicine, The University of British Columbia, Vancouver, British Columbia, Canada
- Centre for Hip Health and Mobility, Vancouver Coastal Health Research Institute, Vancouver, British Columbia, Canada
| | - Yorgi Mavros
- Sydney School of Health Sciences, Faculty of Medicine and Health, The University of Sydney, Sydney, New South Wales, Australia
| | - Nicole Kochan
- Centre for Healthy Brain Ageing, School of Psychiatry, Faculty of Medicine, University of New South Wales, Sydney, New South Wales, Australia
| | - Perminder S Sachdev
- Centre for Healthy Brain Ageing, School of Psychiatry, Faculty of Medicine, University of New South Wales, Sydney, New South Wales, Australia
| | - Jeffrey Hausdorff
- Center for the Study of Movement, Cognition and Mobility, Neurological Institute, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
- Sagol School of Neuroscience and Department of Physical Therapy, Faculty of Medicine, Tel Aviv University Sackler, Tel Aviv, Israel
| | - Emily C Smith
- Human Movement and Nutrition Sciences, Faculty of Health and Behavioural Sciences, The University of Queensland, Herston, Queensland, Australia
| | - Matthew Hollings
- Sydney School of Health Sciences, Faculty of Medicine and Health, The University of Sydney, Sydney, New South Wales, Australia
| | - Tess C Hawkins
- Sydney School of Health Sciences, Faculty of Medicine and Health, The University of Sydney, Sydney, New South Wales, Australia
| | - Nicholas J Ashley
- Sydney School of Health Sciences, Faculty of Medicine and Health, The University of Sydney, Sydney, New South Wales, Australia
| | - Natan Feter
- Postgraduate Program of Physical Education, Universidade Federal de Pelotas, Pelotas, Brazil
| | - Guy C Wilson
- Sydney School of Health Sciences, Faculty of Medicine and Health, The University of Sydney, Sydney, New South Wales, Australia
| | - Isabel Hui En Shih
- Sydney School of Health Sciences, Faculty of Medicine and Health, The University of Sydney, Sydney, New South Wales, Australia
| | - Yareni Guerrero
- Sydney School of Health Sciences, Faculty of Medicine and Health, The University of Sydney, Sydney, New South Wales, Australia
| | - Jiyang Jiang
- Centre for Healthy Brain Ageing, School of Psychiatry, Faculty of Medicine, University of New South Wales, Sydney, New South Wales, Australia
| | - Wei Wen
- Centre for Healthy Brain Ageing, School of Psychiatry, Faculty of Medicine, University of New South Wales, Sydney, New South Wales, Australia
| | - Tom Bailey
- Human Movement and Nutrition Sciences, Faculty of Health and Behavioural Sciences, The University of Queensland, Herston, Queensland, Australia
- School of Nursing Midwifery and Social Work, Faculty of Health and Behavioural Sciences, The University of Queensland, Herston, Queensland, Australia
| | - Dorthe Stensvold
- Department of Circulation and Medical Imaging, Faculty of Medicine and Health Sciences, Norwegian University of Science and Technology, Trondheim, Norway
| | - Ulrik Wisløff
- Human Movement and Nutrition Sciences, Faculty of Health and Behavioural Sciences, The University of Queensland, Herston, Queensland, Australia
- Department of Circulation and Medical Imaging, Faculty of Medicine and Health Sciences, Norwegian University of Science and Technology, Trondheim, Norway
| | - Ryan S Falck
- School of Biomedical Engineering, Faculty of Applied Science, The University of British Columbia, Vancouver, British Columbia, Canada
| | - Maria Fiatarone Singh
- Sydney School of Health Sciences, Faculty of Medicine and Health, The University of Sydney, Sydney, New South Wales, Australia
- Sydney Medical School, Faculty of Medicine and Health, The University of Sydney, Sydney, New South Wales, Australia
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Trade-Off Between Maximal Power Output and Fatigue Resistance of the Knee Extensors for Older Men. J Aging Phys Act 2022; 30:1003-1013. [PMID: 35453123 DOI: 10.1123/japa.2021-0384] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2021] [Revised: 02/15/2022] [Accepted: 02/22/2022] [Indexed: 11/18/2022]
Abstract
This study investigated associations of fatigue resistance determined by an exercise-induced decrease in neuromuscular power with prefatigue neuromuscular strength and power of the knee extensors in 31 older men (65-88 years). A fatigue task consisted of 50 consecutive maximal effort isotonic knee extensions (resistance: 20% of prefatigue isometric maximal voluntary contraction torque) over a 70° range of motion. The average of the peak power values calculated from the 46th to 50th contractions during the fatigue task was normalized to the prefatigue peak power value, which was defined as neuromuscular fatigue resistance. Neuromuscular fatigue resistance was negatively associated with prefatigue maximal power output (r = -.530) but not with prefatigue maximal voluntary contraction torque (r = -.252). This result highlights a trade-off between prefatigue maximal power output and neuromuscular fatigue resistance, implying that an improvement in maximal power output might have a negative impact on neuromuscular fatigue resistance.
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5
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Walker S. Evidence of resistance training-induced neural adaptation in older adults. Exp Gerontol 2021; 151:111408. [PMID: 34022275 DOI: 10.1016/j.exger.2021.111408] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2021] [Revised: 05/04/2021] [Accepted: 05/17/2021] [Indexed: 11/25/2022]
Abstract
The deleterious effects of aging on force production are observable from the age of 40 upwards, depending on the measure. Neural mechanisms contributing to maximum force production and rate of force development have been suggested as descending drive from supraspinal centers, spinal motoneuron excitability, and corticospinal inhibition of descending drive; all of which influence motor unit recruitment and/or firing rate. Resistance-trained Master athletes offer a good source of information regarding the inevitable effects of aging despite the countermeasure of systematic resistance-training. However, most evidence of neural adaptation is derived from longitudinal intervention studies in previously untrained (i.e. resistance-training naïve) older adults. There is good evidence for the effect of resistance-training on the end-point of neural activation, i.e. motor unit behavior, but little to no data on the generation of descending drive from e.g. transcranial magnetic stimulation or cortical imaging studies in older adults. This, along with tracking master athletes over several years, would provide valuable information and could be the focus of future research.
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Affiliation(s)
- Simon Walker
- NeuroMuscular Research Center, Faculty of Sport and Health Sciences, University of Jyväskylä, Finland.
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Elam C, Aagaard P, Slinde F, Svantesson U, Hulthén L, Magnusson PS, Bunketorp-Käll L. The effects of ageing on functional capacity and stretch-shortening cycle muscle power. J Phys Ther Sci 2021; 33:250-260. [PMID: 33814713 PMCID: PMC8012187 DOI: 10.1589/jpts.33.250] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2020] [Accepted: 12/15/2020] [Indexed: 12/19/2022] Open
Abstract
[Purpose] To examine the effects of age and gender in an ageing population with respect
to functional decline and the relationship between muscle power and functional capacity.
[Participants and Methods] The cohort (N=154) was subdivided into youngest-old
(65–70 years.; n=62), middle-old (71–75 years.; n=46), and oldest-old (76–81 years.;
n=46). Measures of mechanical muscle function included countermovement jump height, muscle
power, leg strength and grip strength. Functional performance-based measures included
heel-rise, postural balance, Timed Up and Go, and gait speed. [Results] The oldest-old
performed significantly worse than the middle-old, whereas the youngest-old did not
outperform the middle-old to the same extent. Increased contribution of muscle power was
observed with increasing age. Males had consistently higher scores in measures of
mechanical muscle function, whereas no gender differences were observed for functional
capacity. [Conclusion] The age-related decline in functional capacity appears to
accelerate when approaching 80 years of age and lower limb muscle power seems to
contribute to a greater extent to the preservation of functional balance and gait capacity
at that stage. Males outperform females in measures of mechanical muscle function
independent of age, while the findings give no support for the existence of gender
differences in functional capacity.
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Affiliation(s)
- Cecilia Elam
- Institute of Neuroscience and Physiology, Department of Health and Rehabilitation, Sahlgrenska Academy, University of Gothenburg: Gothenburg, Sweden
| | - Per Aagaard
- Department of Sports Science and Clinical Biomechanics, University of Southern Denmark, Denmark
| | - Frode Slinde
- Department of Food and Nutrition and Sport Science, University of Gothenburg, Sweden
| | - Ulla Svantesson
- Institute of Neuroscience and Physiology, Department of Health and Rehabilitation, Sahlgrenska Academy, University of Gothenburg: Gothenburg, Sweden
| | - Lena Hulthén
- Department of Internal Medicine and Clinical Nutrition, Sahlgrenska Academy, University of Gothenburg, Sweden
| | - Peter S Magnusson
- Department of Physical Therapy, Institute of Sports Medicine Copenhagen, Bispebjerg Hospital, Denmark.,Center for Healthy Aging, Faculty of Health Sciences, University of Copenhagen, Denmark
| | - Lina Bunketorp-Käll
- Institute of Neuroscience and Physiology, Department of Health and Rehabilitation, Sahlgrenska Academy, University of Gothenburg: Gothenburg, Sweden
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Mayer KP, Welle MM, Evans CG, Greenhill BG, Montgomery-Yates AA, Dupont-Versteegden EE, Morris PE, Parry SM. Muscle Power is Related to Physical Function in Patients Surviving Acute Respiratory Failure: A Prospective Observational Study. Am J Med Sci 2020; 361:310-318. [PMID: 33189316 DOI: 10.1016/j.amjms.2020.09.018] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2020] [Revised: 07/22/2020] [Accepted: 09/29/2020] [Indexed: 12/12/2022]
Abstract
BACKGROUND Up to 66% of patients admitted to the intensive care unit (ICU) for acute respiratory failure (ARF) develop ICU-acquired weakness, which is diagnosed by muscle strength testing. Muscle power, different from strength, is an important determinant of function that is not a common focus in patients surviving critical illness. Therefore, the purpose of this study is to assess muscle power in survivors of ARF. METHODS A cross-sectional observational study performed with survivors of ARF. Muscle power, strength and physical function were assessed 4-8 weeks post-hospital discharge. Cross sectional area and echogenicity of rectus femoris and tibialis anterior muscles were assessed using ultrasonography. Healthy community-dwelling adults were included for comparison. RESULTS 12 survivors of ARF mean age of 55.6 ± 17.1 (66% male) and 12 healthy adults mean age of 51.6.1 ± 10.3 (66% male) participated in this study. Patients in the post-ARF group had a mean muscle power of 9.9 ± 3.5 W and 63.7 ± 31.6 W for 2-lb and 10% of body-weight loads, respectively. Compared to matched controls, power in ARF group was reduced by 43%. Muscle power in post-ARF group had moderate correlations with 5-times sit-to-stand testing (r = -0.644, P = 0.024), 4-m habitual gait speed (-0.780, P = 0.002), and 6-min walk distance (r = 0.589, P = 0.044). CONCLUSIONS Muscle power is significantly reduced in survivors of critical illness and associated with deficits in physical function. These preliminary findings may support therapeutic interventions aimed at improving muscle power to potentially increase functional benefit.
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Affiliation(s)
- Kirby P Mayer
- College of Health Sciences, Department of Physical Therapy, University of Kentucky, 900 Rose Street, Wethington 204D, Lexington, KY 40536, United States.
| | - Meghan M Welle
- Center of Excellence in Rural Health, Department of Physical Therapy, University of Kentucky, Lexington, KY, United States
| | - Corey G Evans
- Center of Excellence in Rural Health, Department of Physical Therapy, University of Kentucky, Lexington, KY, United States
| | - Bryana G Greenhill
- Center of Excellence in Rural Health, Department of Physical Therapy, University of Kentucky, Lexington, KY, United States
| | - Ashley A Montgomery-Yates
- Department of Internal Medicine, Division of Pulmonary, Critical Care and Sleep Medicine, University of Kentucky, Lexington, KY, United States
| | - Esther E Dupont-Versteegden
- College of Health Sciences, Department of Physical Therapy, University of Kentucky, 900 Rose Street, Wethington 204D, Lexington, KY 40536, United States
| | - Peter E Morris
- Department of Internal Medicine, Division of Pulmonary, Critical Care and Sleep Medicine, University of Kentucky, Lexington, KY, United States
| | - Selina M Parry
- Department of Physiotherapy, School of Health Sciences, The University of Melbourne, Melbourne, Australia
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Abstract
Prehabilitation aims at enhancing patient’s preoperative functional capacity to better withstand the stress of surgery and recovery.
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Effects of high-protein diet combined with exercise to counteract frailty in pre-frail and frail community-dwelling older adults: study protocol for a three-arm randomized controlled trial. Trials 2020; 21:637. [PMID: 32653012 PMCID: PMC7353704 DOI: 10.1186/s13063-020-04572-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2020] [Accepted: 07/02/2020] [Indexed: 12/26/2022] Open
Abstract
Background The proportion of older citizens is increasing worldwide. A well-known syndrome in old age is physical frailty which is associated with a greater risk of disabilities in activities of daily living, greater reliance on in-home services, hospitalization, institutionalization, and premature mortality. The purpose of this study is to determine the effects of an intervention with high-protein diet alone or in combination with power training in pre-frail and frail old adults. Methods The study is a community-based assessor-blinded parallel randomized controlled trial (RCT), consisting of two phases. Phase 1 is a 1-month stabilization phase, where self-reliant community-dwelling adults + 80 years old will receive individual guidance regarding protein intake, to prevent the risk of negative protein balance prior to phase 2 and to only include participants who have reached the minimum recommended level of protein intake (1.0 g/kg/day) in the randomized controlled trial. Phase 2 is a 4-month RCT where 150 participants will be randomized into the following three arms: protein-only where participants will be provided with dairy products to increase their protein intake to 1.5 g/kg/day, protein + exercise where participants will be provided with the protein intervention in combination with power training two times a week, and recommendation group where participants will continue as in phase 1. Primary outcome is lower leg muscle power. Secondary outcomes include physical function and mobility, frailty status, muscle mechanical function, body composition, nutritional status, and health-related quality of life. The statistical analysis will include an intention-to-treat analysis of all randomized participant and per-protocol analysis of all compliant participants. The study hypothesis will be tested with mixed linear models to assess changes in the main outcomes over time and between study arms. Discussion The finding of this study may add to the knowledge about the beneficial effects of high-protein diet from dairy products combined with power training to counteract frailty in community-dwelling older adults. This may ultimately have an impact on the ability to live well and independent for longer. Trial registration ClinicalTrials.gov NCT03842579. Registered on 15 February 2019, version 1
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Sherwood JJ, Inouye C, Webb SL, O J. Reliability and Validity of the Sit-to-Stand as a Muscular Power Measure in Older Adults. J Aging Phys Act 2020; 28:455-466. [PMID: 31810060 DOI: 10.1123/japa.2019-0133] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2019] [Revised: 10/05/2019] [Accepted: 10/07/2019] [Indexed: 11/18/2022]
Abstract
The study aims were to analyze the reliability and validity of the GymAware™ linear position transducer's velocity and power measures during the sit-to-stand, compared with the Dartfish 2D videography analysis, and to assess the relationship of age and handgrip strength with velocity and power in 48 older men and women (77.6 ± 11.1 years). The results showed excellent agreement between GymAware- and Dartfish-derived sit-to-stand velocity (intraclass correlation coefficient2-1 = .94 and power intraclass correlation coefficient2-1 = .98) measures. A moderate and negative relationship was found between age and velocity (r = -.62; p < .001) and age and power (r = -.63; p < .001). A moderate and positive relationship was found between handgrip strength and velocity (r = .43; p = .002) and handgrip strength and power (r = .54; p < .001). The results show the GymAware velocity and power measures during the sit-to-stand in older adults to be reliable and valid.
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11
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Eccentric Overload Flywheel Training in Older Adults. J Funct Morphol Kinesiol 2019; 4:jfmk4030061. [PMID: 33467376 PMCID: PMC7739307 DOI: 10.3390/jfmk4030061] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/30/2019] [Revised: 08/19/2019] [Accepted: 08/21/2019] [Indexed: 12/01/2022] Open
Abstract
Age-related reductions in muscle strength and muscle power can have significant adverse effects on functional performance in older adults. Exercise training has been shown to be a potent stimulus for improvements in strength and power. However, investigation into how to best optimize training-related adaptations, as well as the accessibility of training methods, is needed. Traditional (TR) methods using gravity-dependent free-weights or weight machines can improve and maintain strength and power but are limited in their ability to provide constant muscle tension and high levels of muscle activation throughout the lowering (eccentric) phase of lifting. Eccentric overload (EO) training may overcome these limitations and has been shown to result in potent adaptations in both young and older adults. Methods of producing EO are significantly limited from a practical perspective. The addition of whole-body flywheel training equipment provides a practical method of producing EO and may be appropriate for older adults wanting to optimize training outcomes. Our review provides limited evidence of the use of eccentric overload flywheel training as a novel training method in seniors. Through the review of literature, EO training overcame some of the limitations set forth by traditional resistance training and demonstrated to have key benefits when combating age-related changes affecting muscle strength and muscle power. It can be concluded that EO training is an important addition to the training arsenal for older adults. Flywheel training provides a practical method of achieving EO, increasing strength and power, combating age-related adaptations, and overall improving quality of life in older adults.
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12
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Franchi MV, Monti E, Carter A, Quinlan JI, Herrod PJJ, Reeves ND, Narici MV. Bouncing Back! Counteracting Muscle Aging With Plyometric Muscle Loading. Front Physiol 2019; 10:178. [PMID: 30890953 PMCID: PMC6411845 DOI: 10.3389/fphys.2019.00178] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2018] [Accepted: 02/12/2019] [Indexed: 12/22/2022] Open
Abstract
The preservation of muscle power is crucial in aging for maintaining mobility and performing daily tasks. Resistance training involving high movement velocities represents a valid strategy to slow down the rate of sarcopenia, counteracting the loss of muscle mass and muscle power. Plyometric exercise may represent an effective training modality for increasing muscle power; however, its application in older populations has been sparingly investigated, as the high impact actions involved may reduce its feasibility for older individuals. By adopting a safer modality of plyometric training, we investigated if a 6-week plyometric training intervention could increase knee extensor muscle size, architecture, force and power in 14 young (YM, age = 25.4 ± 3.5 y; means ± SD) and nine older males (OM, age = 69.7 ± 3.4 y). Volunteers trained 3 times/week using a device similar to a leg press machine where the user was required to bounce against his body mass on a trampoline. Pre-to-post training changes in isometric maximum voluntary torque (MVT), leg extension power and vastus lateralis (VL) architecture were assessed. Muscle power increased in both groups (+27% OM -P < 0.001, 20% YM -P < 0.001), although the total external work performed during the training period was significantly lower for OM (i.e., ~-47%). Both groups showed significant increases in muscle thickness (MT) (+5.8 OM -P < 0.01 vs. +3.8% YM -P < 0.01), fascicle length (Lf) (+8% OM -P < 0.001 vs. +6% YM -P < 0.001), and pennation angle (PA) (+7.5% OM -P < 0.001 vs. +4.1% YM -P < 0.001). The current study shows that trampoline-based plyometric training is an effective intervention producing a rapid increase in muscle mass and power in both young and older individuals. The training modality used in this study seems to particularly benefit the older population, targeting the morphological and functional effects of sarcopenia in human muscle.
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Affiliation(s)
- Martino V Franchi
- Laboratory for Muscle Plasticity, Department of Orthopedics, Balgrist University Hospital, University of Zurich, Zurich, Switzerland.,Sports Medicine Research Group, Department of Orthopedics, Balgrist University Hospital, University of Zurich, Zurich, Switzerland
| | - Elena Monti
- Department of Biomedical Sciences, Institute of Physiology, University of Padua, Padua, Italy
| | - Austin Carter
- MRC-ARUK Centre for Musculoskeletal Ageing, University of Nottingham, Derby, United Kingdom
| | - Jonathan I Quinlan
- School of Sport, Exercise and Rehabilitation Sciences, University of Birmingham, Birmingham, United Kingdom
| | - Philip J J Herrod
- MRC-ARUK Centre for Musculoskeletal Ageing, University of Nottingham, Derby, United Kingdom
| | - Neil D Reeves
- School of Healthcare Science, Manchester Metropolitan University, Manchester, United Kingdom
| | - Marco V Narici
- Department of Biomedical Sciences, Institute of Physiology, University of Padua, Padua, Italy
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13
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Role of Muscle Strength in Balance Assessment and Treatment in Chronic Obstructive Pulmonary Disease. Cardiopulm Phys Ther J 2019. [DOI: 10.1097/cpt.0000000000000093] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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14
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Peyré-Tartaruga LA, Coertjens M. Locomotion as a Powerful Model to Study Integrative Physiology: Efficiency, Economy, and Power Relationship. Front Physiol 2018; 9:1789. [PMID: 30618802 PMCID: PMC6297284 DOI: 10.3389/fphys.2018.01789] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2018] [Accepted: 11/28/2018] [Indexed: 12/02/2022] Open
Abstract
Locomotion is the most common form of movement in nature. Its study allows analysis of interactions between muscle functions (motor) and lever system arrangements (transmission), thereby facilitating performance analysis of various body organs and systems. Thus, it is a powerful model to study various aspects of integrative physiology. The results of this model can be applied in understanding body functions and design principles as performance outputs of interest for medical and biological sciences. The overall efficiency (effoverall) during locomotion is an example of an integrative parameter, which results from the ratio between mechanical output and metabolic input. Although the concepts of cost (i.e., metabolic expenditure relative to distance) and power (i.e., metabolic expenditure relative to time) are included in its calculation, the effoverall establishes peculiar relations with these variables. For a better approach to these aspects, in this study, we presented the physical-mathematical formulation of efficiency, as well as its conceptual definitions and applications. Furthermore, the concepts of efficiency, cost, and power are discussed from the biological and medical perspectives. Terrestrial locomotion is a powerful model to study integrative physiology in humans, because by analyzing the mechanical and metabolic determinants, we may verify the efficiency and economy relationship through locomotion type, and its characteristics and restrictions. Thus, it is possible to elaborate further on various improved intervention strategies, such as physical training, competition strategies, and ergogenic supplementation.
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Affiliation(s)
- Leonardo Alexandre Peyré-Tartaruga
- Exercise Research Laboratory, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.,Postgraduate Program in Pneumological Sciences, Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil
| | - Marcelo Coertjens
- Exercise Research Laboratory, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.,Postgraduate Program in Pneumological Sciences, Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil.,School of Physical Therapy, Federal University of Piauì, Parnaìba, Brazil
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15
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Dobbs TJ, Simonson SR, Conger SA. Improving Power Output in Older Adults Using Plyometrics in a Body Mass-Supported Treadmill. J Strength Cond Res 2018; 32:2458-2465. [PMID: 29985226 DOI: 10.1519/jsc.0000000000002718] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Dobbs, TJ, Simonson, SR, and Conger, SA. Improving power output in older adults using plyometrics in a body mass-supported treadmill. J Strength Cond Res 32(9): 2458-2465, 2018-The purpose of this study was to determine if performing plyometrics in a body mass-supported treadmill would lead to greater increases in power output and functional strength in older adults compared with traditional strength training. Twenty-three participants were randomized to strength (SG, n = 8), plyometric (PG, n = 8), or control (CG, n = 7) groups. The SG and PG exercised 3 times per week for 8 weeks, whereas the CG performed no exercise. Timed sit-to-stand and stair climb, estimated maximal muscular isotonic strength, and isokinetic strength were assessed pre- and posttraining. Significant improvements occurred in the PG vs. CG in the timed chair sit-to-stand (22.11 ± 8.48%; p = 0.013), timed stair climb (14.68 ± 6.28%; p = 0.002), and stair climb power (16.59 ± 9.07%; p < 0.001). PG and SG significantly increased their estimated 1 repetition maximum in the leg extension and single leg lunge (p < 0.05), and PG was significantly more powerful at all 3 velocities in both flexion and extension compared with SG and CG ranging from 24.54 to 61.85% (p < 0.001) except for 60°·s extension during isokinetic testing. Eight weeks of plyometrics in a body mass-supported treadmill can significantly improve functional strength and power in older adults. In this study, the PG increased muscular strength at the same rate or better than the SG without performing any resistance training. The PG also outperformed SG during the functional tests. These results suggest that plyometrics, if modified and performed in a safe environment, can increase muscular strength and power and improve functional abilities in older adults.
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Affiliation(s)
- Tyler J Dobbs
- Department of Kinesiology, Boise State University, Boise, Idaho
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16
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Kato Y, Islam MM, Koizumi D, Rogers ME, Takeshima N. Effects of a 12-week marching in place and chair rise daily exercise intervention on ADL and functional mobility in frail older adults. J Phys Ther Sci 2018; 30:549-554. [PMID: 29706704 PMCID: PMC5909000 DOI: 10.1589/jpts.30.549] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2017] [Accepted: 01/13/2018] [Indexed: 11/24/2022] Open
Abstract
[Purpose] To determine the effects of a 12-week intervention consisting of marching in
place and chair rising daily exercise on activities of daily living and functional
mobility (ability to quickly rise from a chair and walk) in frail older adults. [Subjects
and Methods] Thirty-one participants were divided into exercise (n=18, age=77.6 ±
7.2 years; 11 males, 7 females) and non-exercise (n=13, age=79.6 ± 7.7 years; 7 males, 6
females) groups. The exercise group performed 12 weeks of training, 7 days per week, and
20 minutes per session. The exercise program consisted of low to moderate intensity
marching in place and chair rising movements. The speed of movements was gradually
increased over time. The Barthel index, mean power during chair stand, and time to
complete a 10-m walk were assessed before and after the intervention. [Results]
Significant improvements were noted in the exercise group compared to the non-exercise
group for the Barthel Index (11.6%), mean power (33%), and 10-M walk (14.6%) with a medium
effect size, and relative mean power (power/body mass) (32.9%) with a large effect size.
[Conclusion] The progressive marching in place and chair rising exercise intervention
appears to be effective in improving activities of daily living and functional mobility
among frail older adults.
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Affiliation(s)
- Yoshiji Kato
- Medical Care and Nursing, Trident College of Sports, Japan.,Active Aging Association, Japan
| | - Mohammod M Islam
- Active Aging Association, Japan.,National Institute of Fitness and Sports in Kanoya: 1 Shiromizu-cho, Kanoya, Kagoshima 891-2393, Japan
| | - Daisuke Koizumi
- Active Aging Association, Japan.,Yokkaichi University, Japan
| | - Michael E Rogers
- Department of Human Performance Studies, Wichita State University, USA
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17
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Da Boit M, Sibson R, Sivasubramaniam S, Meakin JR, Greig CA, Aspden RM, Thies F, Jeromson S, Hamilton DL, Speakman JR, Hambly C, Mangoni AA, Preston T, Gray SR. Sex differences in the effect of fish-oil supplementation on the adaptive response to resistance exercise training in older people: a randomized controlled trial. Am J Clin Nutr 2017; 105:151-158. [PMID: 27852617 PMCID: PMC5183731 DOI: 10.3945/ajcn.116.140780] [Citation(s) in RCA: 127] [Impact Index Per Article: 18.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2016] [Accepted: 10/13/2016] [Indexed: 12/05/2022] Open
Abstract
BACKGROUND Resistance exercise increases muscle mass and function in older adults, but responses are attenuated compared with younger people. Data suggest that long-chain n-3 polyunsaturated fatty acids (PUFAs) may enhance adaptations to resistance exercise in older women. To our knowledge, this possibility has not been investigated in men. OBJECTIVE We sought to determine the effects of long-chain n-3 PUFA supplementation on resistance exercise training-induced increases in muscle mass and function and whether these effects differ between older men and women. DESIGN Fifty men and women [men: n = 27, mean ± SD age: 70.6 ± 4.5 y, mean ± SD body mass index (BMI; in kg/m2): 25.6 ± 4.2; women: n = 23, mean ± SD age: 70.7 ± 3.3 y, mean ± SD BMI: 25.3 ± 4.7] were randomly assigned to either long-chain n-3 PUFA (n = 23; 3 g fish oil/d) or placebo (n = 27; 3 g safflower oil/d) and participated in lower-limb resistance exercise training twice weekly for 18 wk. Muscle size, strength, and quality (strength per unit muscle area), functional abilities, and circulating metabolic and inflammatory markers were measured before and after the intervention. RESULTS Maximal isometric torque increased after exercise training to a greater (P < 0.05) extent in the long-chain n-3 PUFA group than in the placebo group in women, with no differences (P > 0.05) between groups in men. In both sexes, the effect of exercise training on maximal isokinetic torque at 30, 90, and 240° s-1, 4-m walk time, chair-rise time, muscle anatomic cross-sectional area, and muscle fat did not differ (P > 0.05) between groups. There was a greater (P < 0.05) increase in muscle quality in women after exercise training in the long-chain n-3 PUFA group than in the placebo group, with no such differences in men (P > 0.05). Long-chain n-3 PUFAs resulted in a greater decrease (P < 0.05) than the placebo in plasma triglyceride concentrations in both sexes, with no differences (P > 0.05) in glucose, insulin, or inflammatory markers. CONCLUSION Long-chain n-3 PUFA supplementation augments increases in muscle function and quality in older women but not in older men after resistance exercise training. This trial was registered at clinicaltrials.gov as NCT02843009.
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Affiliation(s)
| | | | | | - Judith R Meakin
- Exeter MR Research Centre, University of Exeter, Exeter, United Kingdom
| | - Carolyn A Greig
- School of Sport, Exercise and Rehabilitation Sciences and
- Medical Research Council Arthritis Research United Kingdom Centre for Musculoskeletal Ageing Research, University of Birmingham, Birmingham, United Kingdom
| | | | | | - Stewart Jeromson
- Faculty of Health Sciences and Sport, University of Stirling, Stirling, United Kingdom
| | - D Lee Hamilton
- Faculty of Health Sciences and Sport, University of Stirling, Stirling, United Kingdom
| | - John R Speakman
- School of Biological Sciences, University of Aberdeen, Aberdeen, United Kingdom
- Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, China
| | - Catherine Hambly
- School of Biological Sciences, University of Aberdeen, Aberdeen, United Kingdom
| | - Arduino A Mangoni
- Department of Clinical Pharmacology, School of Medicine, Flinders University, Adelaide, Australia; and
| | - Thomas Preston
- Scottish Universities Environmental Research Centre, University of Glasgow, Glasgow, United Kingdom
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18
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Straight CR, Lindheimer JB, Brady AO, Dishman RK, Evans EM. Effects of Resistance Training on Lower-Extremity Muscle Power in Middle-Aged and Older Adults: A Systematic Review and Meta-Analysis of Randomized Controlled Trials. Sports Med 2016; 46:353-64. [PMID: 26545362 DOI: 10.1007/s40279-015-0418-4] [Citation(s) in RCA: 88] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
BACKGROUND Resistance training (RT) has been investigated as a potential intervention strategy for improving muscle function, but the effects on lower-extremity muscle power in middle-aged and older adults have not been systematically reviewed. OBJECTIVE The aim of this meta-analysis is to provide a quantitative estimate of the effect of RT on lower-extremity muscle power in middle-aged and older adults and to examine independent moderators of this relationship. METHODS Randomized controlled trials that examined the effects of RT on either leg press (LP) or knee extension (KE) muscle power in adults aged ≥50 years were included. Data were aggregated with meta-analytic techniques, and multi-level modeling was used to adjust for nesting effects. A total of 52 effects from 12 randomized controlled trials were analyzed with a random-effects model to estimate the effect of RT on lower-extremity muscle power. A multiple-regression analysis was conducted to examine independent moderators of the mean effect. RESULTS The adjusted aggregated results from all studies indicate that RT has a small-to-moderate effect on lower-extremity muscle power (Hedges' d = 0.34, 95% confidence interval [CI] 0.25-0.43), which translated to 54.90 watts (95 % CI 40.37-69.43). Meta-regression analyses indicated that high-velocity RT was superior to traditional RT (Δ = 0.62 vs. 0.20, respectively) for increasing lower-extremity muscle power. In addition, training volume significantly moderated the effect of RT on muscle power. CONCLUSION The findings from this meta-analysis indicate that RT is an efficacious intervention strategy for improving LP and KE muscle power in adults aged ≥50 years. Training mode and volume independently moderate the effect of RT on lower-extremity muscle power, and should be considered when prescribing RT exercise for middle-aged and older adults.
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Affiliation(s)
- Chad R Straight
- Department of Kinesiology, University of Georgia, 330 River Road, Athens, GA, 30602, USA.
| | - Jacob B Lindheimer
- Department of Kinesiology, University of Georgia, 330 River Road, Athens, GA, 30602, USA
| | - Anne O Brady
- Department of Kinesiology, University of North Carolina at Greensboro, Greensboro, NC, USA
| | - Rodney K Dishman
- Department of Kinesiology, University of Georgia, 330 River Road, Athens, GA, 30602, USA
| | - Ellen M Evans
- Department of Kinesiology, University of Georgia, 330 River Road, Athens, GA, 30602, USA
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19
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Kato Y, Islam MM, Young KC, Rogers ME, Takeshima N. Threshold of chair stand power necessary to perform activities of daily living independently in community-dwelling older women. J Geriatr Phys Ther 2016; 38:122-6. [PMID: 25594522 DOI: 10.1519/jpt.0000000000000036] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
PURPOSE To determine (1) the reproducibility of measurements of chair stand mean power (CSMP), (2) the relationships of CSMP with age, height, body mass, and body mass index, and (3) to identify the threshold of CSMP below which performing activities of daily living (ADL) is limited in older women. METHODS Eighty-seven older women (70-88 years) were divided into an independent group (n = 48) who needed no assistance and a dependent group (n = 39) who needed assistance to perform ADL. The CSMP expressed in watts (velocity × load) for each repetition was assessed by a device that measures mean velocity. RESULTS The intraclass correlation coefficient for CSMP suggested a high level of reproducibility (intra-class correlation coefficient = 0.88-0.92, P < .05). Relationships existed between CSMP and age (r = -0.37; P < .001), CSMP and height (r = 0.31; P < .001), CSMP and body mass (r = 0.43; P < .001), and CSMP and body mass index (r = 0.30; P < .001). A receiver operator characteristic curve analysis revealed the optimal threshold criteria; a CSMP of 214 watts resulted in the highest combination of sensitivity (82.1%) and specificity (81.2%). CONCLUSION The threshold of CSMP below which assistance is required to perform ADL in community-dwelling older women was identified.
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Affiliation(s)
- Yoshiji Kato
- 1Lab of Exercise Gerontology, Graduate School of Natural Sciences, Nagoya City University, Nagoya, Japan. 2Department of Rehabilitation, Yonaha General Hospital, Kuwana, Mie, Japan. 3Department of Human Performance Studies, Center for Physical Activity and Aging, Wichita State University, Wichita, Kansas. 4National Institute of Fitness and Sports in Kanoya, Kanoya, Japan
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20
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Ageing, Muscle Power and Physical Function: A Systematic Review and Implications for Pragmatic Training Interventions. Sports Med 2016; 46:1311-32. [DOI: 10.1007/s40279-016-0489-x] [Citation(s) in RCA: 107] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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21
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Han L, Yang F. Strength or power, which is more important to prevent slip-related falls? Hum Mov Sci 2015; 44:192-200. [DOI: 10.1016/j.humov.2015.09.001] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2015] [Revised: 09/01/2015] [Accepted: 09/05/2015] [Indexed: 11/25/2022]
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22
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Glenn JM, Gray M, Binns A. The effects of loaded and unloaded high-velocity resistance training on functional fitness among community-dwelling older adults. Age Ageing 2015; 44:926-31. [PMID: 26163681 DOI: 10.1093/ageing/afv081] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2014] [Accepted: 03/11/2015] [Indexed: 11/12/2022] Open
Abstract
BACKGROUND Physical function declines up to 4% per year after the age of 65. High-velocity training is important for maintaining muscular power and ultimately, physical function; however, whether performing high-velocity training without external resistance increases functional fitness among older adults remains unclear. OBJECTIVE The purpose of this investigation was to evaluate loaded and unloaded high-velocity training on lower body muscular power and functional fitness in older adults. SUBJECTS Fifty-seven community-dwelling older adults (n = 16 males, n = 41 females) participated in this study. Inclusion criteria comprised ≥65 years of age, ≥24 on the Mini-mental state examination and no falls within past year. METHODS Two groups completed a 20-week high-velocity training intervention. The non-weighted group (UNLOAD, n = 27) performed the protocol without external load while the intervention group (LOAD, n = 30) used external loads via exercise machines. Functional fitness was assessed using the Short Physical Performance Battery (SPPB), Senior Fitness Test (SFT), hand-grip and lower body power measures. RESULTS Multivariate ANOVA revealed that both groups had significant improvements for average (17.21%) and peak (9.26%) lower body power, along with the SFT arm curl (16.94%), chair stand (20.10%) and 8 ft. up-and-go (15.67%). Improvements were also noticed for SPPB 8 ft. walk (25.21%). However, improvements for all functional fitness measures were independent of training group. CONCLUSIONS Unloaded high-velocity training increased functional fitness and power the same as loaded training. The ability of high-velocity movements to elicit gains in functional fitness without external loads may help health professionals develop fitness programs when time/space is limiting factor.
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Affiliation(s)
- Jordan M Glenn
- Health, Human Performance, and Recreation, University of Arkansas, Fayetteville, AR, USA
| | - Michelle Gray
- Health, Human Performance, and Recreation, University of Arkansas, Fayetteville, AR, USA
| | - Ashley Binns
- Health, Human Performance, and Recreation, University of Arkansas, Fayetteville, AR, USA
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23
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STROLLO S, CASEROTTI P, WARD R, GLYNN N, GOODPASTER B, STROTMEYER E. A review of the relationship between leg power and selected chronic disease in older adults. J Nutr Health Aging 2015; 19:240-8. [PMID: 25651453 PMCID: PMC4840887 DOI: 10.1007/s12603-014-0528-y] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
OBJECTIVE This review investigates the relationship between leg muscle power and the chronic conditions of osteoarthritis, diabetes mellitus, and cardiovascular disease among older adults. Current literature assessing the impact of chronic disease on leg power has not yet been comprehensively characterized. Importantly, individuals with these conditions have shown improved leg power with training. METHODS A search was performed using PubMed to identify original studies published in English from January 1998 to August 2013. Leg power studies, among older adults ≥ 50 years of age, which assessed associations with osteoarthritis, diabetes mellitus, and/or cardiovascular disease were selected. Studies concerning post-surgery rehabilitation, case studies, and articles that did not measure primary results were excluded. RESULTS Sixteen studies met inclusion criteria, addressing osteoarthritis (n=5), diabetes mellitus (n=5), and cardiovascular disease (n=6). Studies generally supported associations of lower leg power among older adults with chronic disease, although small sample sizes, cross-sectional data, homogenous populations, varied disease definitions, and inconsistent leg power methods limited conclusions. CONCLUSIONS Studies suggest that osteoarthritis, diabetes mellitus, and cardiovascular disease are associated with lower leg power compared to older adults without these conditions. These studies are limited, however, by the heterogeneity in study populations and a lack of standardized measurements of leg power. Future larger studies of more diverse older adults with well-defined chronic disease using standard measures of leg power and interventions to improve leg power in these older adults with chronic disease are needed.
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Affiliation(s)
- S.E. STROLLO
- National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
| | - P. CASEROTTI
- Department of Sports Science and Clinical Biomechanics, University of Southern Denmark, Odense, Denmark
| | - R.E. WARD
- Health and Disability Research Institute, Boston University, Spaulding Rehabilitation Hospital, Boston, MA, USA
| | - N.W. GLYNN
- Department of Epidemiology, University of Pittsburgh, Pittsburgh, PA, USA
| | - B.H. GOODPASTER
- Sanford Burnham Medical Research Institute, Orlando, FL, USA
| | - E.S. STROTMEYER
- Department of Epidemiology, University of Pittsburgh, Pittsburgh, PA, USA
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24
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Reid KF, Martin KI, Doros G, Clark DJ, Hau C, Patten C, Phillips EM, Frontera WR, Fielding RA. Comparative effects of light or heavy resistance power training for improving lower extremity power and physical performance in mobility-limited older adults. J Gerontol A Biol Sci Med Sci 2014; 70:374-80. [PMID: 25199912 DOI: 10.1093/gerona/glu156] [Citation(s) in RCA: 95] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND We compared the effects of two uniquely different lower extremity power training interventions on changes in muscle power, physical performance, neuromuscular activation, and muscle cross sectional area in mobility-limited older adults. METHODS Fifty-two subjects (78±5 years, short physical performance battery score: 8.1±1) were randomized to either 16 weeks of progressive high velocity resistance training performed at low external resistance (40% of the 1-repetition maximum [1-RM] [LO]) or high external resistance (70% of 1RM [HI]). Both groups completed three sets of leg and knee extension exercises at maximum voluntary velocity, two times per week. Neuromuscular activation was assessed using surface electromyography and muscle cross sectional area (CSA) was measured using computed tomography. RESULTS At 16 weeks, LO and HI exhibited significant and similar within-group increases of leg extensor peak power (~34% vs ~42%), strength (~13% vs ~19%), and SPPB score (1.4±0.3 vs 1.8±0.3 units), respectively (all P < .03). Improvements in neuromuscular activation occurred in LO (P = .03) while small gains in mid-thigh muscle CSA were detected in LO (1.6%, P = .35) and HI (2.1%, P = .17). No significant between-group differences were evident for any measured parameters (all P > .25). CONCLUSIONS High velocity resistance training with low external resistance yields similar improvements in muscle power and physical performance compared to training with high external resistance in mobility-limited elders. These findings may have important implications for optimizing exercise interventions for older adults with mobility limitations.
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Affiliation(s)
- Kieran F Reid
- Nutrition, Exercise Physiology and Sarcopenia Laboratory, Jean Mayer USDA Human Nutrition Research Center on Aging at Tufts University, Boston, Massachusetts. Department of Clinical Medicine, Trinity College Dublin, Dublin, Ireland
| | - Kimberly I Martin
- Nutrition, Exercise Physiology and Sarcopenia Laboratory, Jean Mayer USDA Human Nutrition Research Center on Aging at Tufts University, Boston, Massachusetts
| | - Gheorghe Doros
- Department of Biostatistics, Boston University School of Public Health, Massachusetts
| | - David J Clark
- Brain Rehabilitation Research Center, Malcom Randall VA Medical Center and Department of Aging and Geriatric Research, University of Florida, Gainesville
| | - Cynthia Hau
- Nutrition, Exercise Physiology and Sarcopenia Laboratory, Jean Mayer USDA Human Nutrition Research Center on Aging at Tufts University, Boston, Massachusetts
| | - Carolynn Patten
- Brain Rehabilitation Research Center, Malcom Randall VA Medical Center and Department of Physical Therapy, University of Florida, Gainesville, Florida
| | - Edward M Phillips
- Nutrition, Exercise Physiology and Sarcopenia Laboratory, Jean Mayer USDA Human Nutrition Research Center on Aging at Tufts University, Boston, Massachusetts. Department of Physical Medicine and Rehabilitation, Harvard Medical School and Spaulding Rehabilitation Hospital, Boston, Massachusetts
| | - Walter R Frontera
- Department of Physical Medicine and Rehabilitation, Harvard Medical School and Spaulding Rehabilitation Hospital, Boston, Massachusetts. Department of Physiology, University of Puerto Rico School of Medicine, San Juan, Puerto Rico. Department of Physical Medicine and Rehabilitation, Vanderbilt University, Nashville, Tennessee
| | - Roger A Fielding
- Nutrition, Exercise Physiology and Sarcopenia Laboratory, Jean Mayer USDA Human Nutrition Research Center on Aging at Tufts University, Boston, Massachusetts.
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25
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Sayers SP, Gibson K. High-speed power training in older adults: a shift of the external resistance at which peak power is produced. J Strength Cond Res 2014; 28:616-21. [PMID: 23897022 PMCID: PMC3902133 DOI: 10.1519/jsc.0b013e3182a361b8] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Studies have shown that power training increases peak power (PP) in older adults. Evaluating the external resistance (% 1 repetition maximum [1RM]) at which PP is developed is critical given that changes in the components of PP (force and velocity) are dependent on the %1RM at which PP occurs. The purpose of this study was to compare the changes in PP (and the external resistance at which PP occurred) after 12 weeks of high-speed power training (HSPT) vs. traditional slow-speed strength training (SSST). Seventy-two older men and women were randomized to HSPT at 40% of the 1RM (HSPT: n = 24 [70.8 ± 6.8 years]); traditional resistance training at 80% 1RM (SSST: n = 22 [68.6 ± 7.8 years]); or control (CON: n = 18 [71.5 ± 6.1 years]). Measures of muscle performance were obtained at baseline and after the 12-week training intervention. Changes in muscle power and 1RM strength improved similarly with both HSPT and SSST, but HSPT shifted the external resistance at which PP was produced to a lower external resistance (from 67% 1RM to 52% 1RM) compared with SSST (from 65% 1RM to 62% 1RM) (p ≤ 0.05), thus increasing the velocity component of PP (change: HSPT = 0.18 ± 0.21 m·s; SSST = -0.03 ± 0.15 m·s) (p ≤ 0.05). Because sufficient speed of the lower limb is necessary for functional tasks related to safety (crossing a busy intersection, fall prevention), HSPT should be implemented in older adults to improve power at lower external resistances, thus increasing the velocity component of power and making older adults safer in their environment. These data provide clinicians with the necessary information to tailor exercise programs to the individual needs of the older adult, affecting the components of power.
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Affiliation(s)
- Stephen P Sayers
- Department of Physical Therapy, University of Missouri, Columbia, Missouri
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26
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Mair JL, Laudani L, Vannozzi G, De Vito G, Boreham C, Macaluso A. Neuromechanics of repeated stepping with external loading in young and older women. Eur J Appl Physiol 2014; 114:983-94. [PMID: 24504651 DOI: 10.1007/s00421-014-2826-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2013] [Accepted: 01/18/2014] [Indexed: 11/28/2022]
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27
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Leszczak TJ, Olson JM, Stafford J, Brezzo RD. Early adaptations to eccentric and high-velocity training on strength and functional performance in community-dwelling older adults. J Strength Cond Res 2013; 27:442-8. [PMID: 22465984 DOI: 10.1519/jsc.0b013e31825423c6] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The authors examined whether an eccentric training program or a high-velocity training program was more beneficial in regards to function and strength. Nineteen community-dwelling older adults, between the ages of 65 and 89 years, from a local senior center participated in the 8-week exercise program. All participants were randomly assigned to either an eccentric or a high-velocity training group. A doubly multivariate analysis of variance with 1 between-subjects factor and repeated measures was used to examine group and time differences. This analysis revealed that no differences existed between the groups (p > 0.05). However, there were within-group differences for both the high-velocity and the eccentric groups. For both groups, walking speed, 8-ft up-and-go time, chair stand, leg extension strength, leg curl strength, and leg press strength increased from preintervention to postintervention (p < 0.05). This suggests that a high-velocity training program provides similar results as an eccentric training program but with less total work. The eccentric training group trained at a higher percentage of their 1RM and tested with higher loads, which may suggest that a longer exercise program would show the eccentric training group to be stronger and more functional. Fitness practitioners dealing with an older adult population should focus on training with all types of training velocities. Not only are these types of training modalities safe for this population but they also can improve their ability to perform activities of daily living.
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Affiliation(s)
- Timothy J Leszczak
- Department of Health and Human Performance, Austin Peay State University, Clarksville, Tennessee, USA.
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Hamilton DF, McLeish JA, Gaston P, Simpson AHRW. Muscle 'regenerative potential' determinesphysical recovery following total knee replacement. Bone Joint Res 2013; 2:70-8. [PMID: 23673375 PMCID: PMC3638306 DOI: 10.1302/2046-3758.24.2000151] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
Objectives Lower limb muscle power is thought to influence outcome following
total knee replacement (TKR). Post-operative deficits in muscle
strength are commonly reported, although not explained. We hypothesised
that post-operative recovery of lower limb muscle power would be
influenced by the number of satellite cells in the quadriceps muscle at
time of surgery. Methods Biopsies were obtained from 29 patients undergoing TKR. Power
output was assessed pre-operatively and at six and 26 weeks post-operatively
with a Leg Extensor Power Rig and data were scaled for body weight.
Satellite cell content was assessed in two separate analyses, the
first cohort (n = 18) using immunohistochemistry and the second
(n = 11) by a new quantitative polymerase chain reaction (q-PCR)
protocol for Pax-7 (generic satellite cell marker) and Neural Cell
Adhesion Molecule (NCAM; marker of activated cells). Results A significant improvement in power output was observed post-operatively
with a mean improvement of 19.7 W (95% confidence interval (CI)
14.43 to 30.07; p < 0.001) in the first cohort and 27.5 W (95%
CI 13.2 to 41.9; p = 0.002) in the second. A strong correlation
was noted between satellite cell number (immunohistochemistry) and improvement
in patient power output (r = 0.64, p = 0.008). Strong correlation
was also observed between the expression of Pax-7 and power output
(r = 0.79, p = 0.004), and the expression of NCAM and power output
(r = 0.84, p = 0.001). The generic marker explained 58% of the variation
in power output, and the marker of activated cells 67%. Conclusions Muscle satellite cell content may determine improvement in lower
limb power generation (and thus function) following TKR.
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Affiliation(s)
- D F Hamilton
- University of Edinburgh, Departmentof Orthopaedics, Chancellor's Building, LittleFrance Crescent, Edinburgh EH16 4SB, UK
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Traditional Versus Functional Strength Training: Effects on Muscle Strength and Power in the Elderly. J Aging Phys Act 2013; 21:51-70. [DOI: 10.1123/japa.21.1.51] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The aim was to determine whether strength training with machines vs. functional strength training at 80% of one-repetition maximum improves muscle strength and power among the elderly. Sixty-three subjects (69.9 ± 4.1 yr) were randomized to a high-power strength group (HPSG), a functional strength group (FSG), or a nonrandomized control group (CG). Data were collected using a force platform and linear encoder. The training dose was 2 times/wk, 3 sets × 8 reps, for 11 wk. There were no differences in effect between HPSG and FSG concerning sit-to-stand power, box-lift power, and bench-press maximum force. Leg-press maximum force improved in HPSG (19.8%) and FSG (19.7%) compared with CG (4.3%;p= .026). Bench-press power improved in HPSG (25.1%) compared with FSG (0.5%,p= .02) and CG (2%,p= .04). Except for bench-press power there were no differences in the effect of the training interventions on functional power and maximal body strength.
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Duffy CR, Stewart D, Pecoraro F, Riches PE, Farina D, Macaluso A. Comparison of power and EMG during 6-s all-out cycling between young and older women. J Sports Sci 2012; 30:1311-21. [PMID: 22852884 DOI: 10.1080/02640414.2012.710752] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
To investigate the effects of ageing on the neural control strategies governing sprint cycling on a friction-loaded cycle-ergometer, 10 older (aged 70-83 yr) and 8 young (aged 19-35 yr) healthy women completed seven 6-s all-out cycling trials against varying loads. Root mean square (RMS), median frequency and muscle fibre conduction velocity were determined from the vastus lateralis of the dominant limb during each pedal stroke. Peak power was 43% lower in the older group compared to the younger (p < 0.001) and was accompanied by a significantly lower RMS (p < 0.05). No differences were observed in the other electromyography (EMG) parameters between the groups (p > 0.05). ΔRMS from the first to the sixth second during each trial was found to increase significantly with the development of power output in both groups (p < 0.05). For the first time during an all-out 6-s cycle trial, it has been demonstrated that older women's lower mechanical power output was accompanied by a significantly lower RMS, which indicates a decline in either the number of active of motor units or a reduced discharge rate. Hence, changes in motor units can be regarded as a contributory factor to the decline of muscle power with advancing age. Overall, though, similar neural strategies are adopted in both younger and older populations.
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Affiliation(s)
- Charles R Duffy
- Strathclyde Institute of Pharmacy and Biomedical Sciences-SIPBS, University of Strathclyde, Glasgow, United Kingdom
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Arai T, Obuchi S, Shiba Y, Omuro K, Inaba Y, Kojima M. The validity of an assessment of maximum angular velocity of knee extension (KE) using a gyroscope. Arch Gerontol Geriatr 2011; 54:e175-80. [PMID: 22100108 DOI: 10.1016/j.archger.2011.10.012] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2011] [Accepted: 10/24/2011] [Indexed: 11/18/2022]
Abstract
Although it is more important to assess the muscular power of the lower extremities than the strength, no simplified method for doing so has been found. The aim of this study was to assess the validity of the assessment of the angular velocity of KE using a gyroscope. Participants included 105 community-dwelling older people (55 women, 50 men, age ± standard deviation (SD) 75±5.3). Pearson correlation coefficients and Spearman rank-correlation coefficients were used to examine the relationships between the angular velocity of KE and functional performance measurements, a self-efficacy scale and health-related quality of life (HRQOL). The data from the gyroscope were significantly correlated with some physical functions such as muscle strength (r=0.304, p<0.01), and walking velocity (r=0.543, p<0.001). In addition, the joint angular velocity was significantly correlated with self-efficacy (r=0.219-0.329, p<0.01-0.05) and HRQOL (r=0.207-0.359, p<0.01-0.05). The absolute value of the correlation coefficient of angular velocity tended to be greater than that of the muscle strength for mobility functions such as walking velocity and the timed-up-and-go (TUG) test. In conclusion, it was found that the assessment of the angular velocity of the knee joint using a gyroscope could be a feasible and meaningful measurement in the geriatrics field.
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Affiliation(s)
- Takeshi Arai
- Faculty of Health Sciences, Mejiro University, 320 Ukiya, Iwatuki-ku, Saitama-shi, Saitama 339-8501, Japan.
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Abstract
BACKGROUND Levels of physical fitness are low after stroke. It is unknown whether improving physical fitness after stroke reduces disability. OBJECTIVES To determine whether fitness training after stroke reduces death, dependence, and disability. The secondary aims were to determine the effects of training on physical fitness, mobility, physical function, quality of life, mood, and incidence of adverse events. SEARCH METHODS We searched the Cochrane Stroke Group Trials Register (last searched April 2010), the Cochrane Central Register of Controlled Trials (CENTRAL) (The Cochrane Library, July 2010), MEDLINE (1966 to March 2010), EMBASE (1980 to March 2010), CINAHL (1982 to March 2010), SPORTDiscus (1949 to March 2010), and five additional databases (March 2010). We also searched ongoing trials registers, handsearched relevant journals and conference proceedings, screened reference lists, and contacted experts in the field. SELECTION CRITERIA Randomised trials comparing either cardiorespiratory training or resistance training, or both, with no intervention, a non-exercise intervention, or usual care in stroke survivors. DATA COLLECTION AND ANALYSIS Two review authors independently selected trials, assessed quality, and extracted data. We analysed data using random-effects meta-analyses. Diverse outcome measures limited the intended analyses. MAIN RESULTS We included 32 trials, involving 1414 participants, which comprised cardiorespiratory (14 trials, 651 participants), resistance (seven trials, 246 participants), and mixed training interventions (11 trials, 517 participants). Five deaths were reported at the end of the intervention and nine at the end of follow-up. No dependence data were reported. Diverse outcome measures made data pooling difficult. The majority of the estimates of effect were not significant. Cardiorespiratory training involving walking improved maximum walking speed (mean difference (MD) 8.66 metres per minute, 95% confidence interval (CI) 2.98 to 14.34), preferred gait speed (MD 4.68 metres per minute, 95% CI 1.40 to 7.96) and walking capacity (MD 47.13 metres per six minutes, 95% CI 19.39 to 74.88) at the end of the intervention. These training effects were retained at the end of follow-up. Mixed training, involving walking, increased preferred walking speed (MD 2.93 metres per minute, 95% CI 0.02 to 5.84) and walking capacity (MD 30.59 metres per six minutes, 95% CI 8.90 to 52.28) but effects were smaller and there was heterogeneity amongst the trial results. There were insufficient data to assess the effects of resistance training. The variability in the quality of included trials hampered the reliability and generalizability of the observed results. AUTHORS' CONCLUSIONS The effects of training on death, dependence, and disability after stroke are unclear. There is sufficient evidence to incorporate cardiorespiratory training involving walking within post-stroke rehabilitation programmes to improve speed, tolerance, and independence during walking. Further well-designed trials are needed to determine the optimal exercise prescription and identify long-term benefits.
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Affiliation(s)
- Miriam Brazzelli
- Division of Clinical Neurosciences, University of Edinburgh, Edinburgh, UK
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Harris C, Wattles AP, DeBeliso M, Sevene-Adams PG, Berning JM, Adams KJ. The Seated Medicine Ball Throw as a Test of Upper Body Power in Older Adults. J Strength Cond Res 2011; 25:2344-8. [DOI: 10.1519/jsc.0b013e3181ecd27b] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Associations of the Stair Climb Power Test with muscle strength and functional performance in people with chronic obstructive pulmonary disease: a cross-sectional study. Phys Ther 2010; 90:1774-82. [PMID: 21030661 DOI: 10.2522/ptj.20100091] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
BACKGROUND The Stair Climb Power Test (SCPT) is a functional test associated with leg muscle power in older people. OBJECTIVE The purposes of this study were to compare the results of the SCPT in people with chronic obstructive pulmonary disease (COPD) and people who were healthy and to explore associations of the SCPT with muscle strength (force-generating capacity) and functional performance. DESIGN The study was a cross-sectional investigation. METHODS Twenty-one people with COPD and a predicted mean (SD) percentage of forced expiratory volume in 1 second of 47.2 (12.9) and 21 people who were healthy and matched for age, sex, and body mass were tested with the SCPT. Knee extensor and flexor muscle torque was assessed with an isokinetic dynamometer. Functional performance was assessed with the Timed "Up & Go" Test (TUG) and the Six-Minute Walk Test (6MWT). RESULTS People with COPD showed lower values on the SCPT (28%) and all torque measures (∼ 32%), except for eccentric knee flexor muscle torque. In people with COPD, performance on the TUG and 6MWT was lower by 23% and 28%, respectively. In people with COPD, the SCPT was moderately associated with knee extensor muscle isometric and eccentric torque (r ≥.46) and strongly associated (r=.68) with the 6MWT. In people who were healthy, the association of the SCPT with knee extensor muscle torque tended to be stronger (r ≥.66); however, no significant relationship between the SCPT and measures of functional performance was found. LIMITATIONS The observational design of the study and the use of a relatively small convenience sample limit the generalizability of the findings. CONCLUSIONS The SCPT is a simple and safe test associated with measures of functional performance in people with COPD. People with COPD show deficits on the SCPT. However, the SCPT is only moderately associated with muscle torque and thus cannot be used as a simple surrogate for muscle strength in people with COPD.
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Sayers SP, Gibson K. A Comparison of High-Speed Power Training and Traditional Slow-Speed Resistance Training in Older Men and Women. J Strength Cond Res 2010; 24:3369-80. [DOI: 10.1519/jsc.0b013e3181f00c7c] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Effect of moderate intensity resistance training during weight loss on body composition and physical performance in overweight older adults. Eur J Appl Physiol 2010; 109:517-25. [DOI: 10.1007/s00421-010-1387-9] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/29/2010] [Indexed: 12/25/2022]
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Abstract
BACKGROUND Physical fitness is low after stroke. It is unknown whether improving physical fitness after stroke reduces disability. OBJECTIVES To determine whether fitness training (cardiorespiratory or strength, or both) after stroke reduces death, dependence and disability. The secondary aims were to determine the effects of fitness training on physical fitness, mobility, physical function, health status and quality of life, mood and incidence of adverse events. SEARCH STRATEGY We searched the Cochrane Stroke Group Trials Register (last searched March 2009), the Cochrane Central Register of Controlled Trials (The Cochrane Library Issue 1, 2007), MEDLINE (1966 to March 2007), EMBASE (1980 to March 2007), CINAHL (1982 to March 2007), and six additional databases to March 2007. We handsearched relevant journals and conference proceedings, and screened bibliographies. We searched trials registers and contacted experts in the field. SELECTION CRITERIA We included randomised controlled trials if the aim of the intervention was to improve muscle strength or cardiorespiratory fitness, or both, and if the control groups comprised either no intervention, usual care or a non-exercise intervention. DATA COLLECTION AND ANALYSIS Two review authors determined trial eligibility and quality. One review author extracted outcome data at end of intervention and follow-up scores, or as change from baseline scores. Diverse outcome measures limited the intended analysis. MAIN RESULTS We included 24 trials, involving 1147 participants, comprising cardiorespiratory (11 trials, 692 participants), strength (four trials, 158 participants) and mixed training interventions (nine trials, 360 participants). Death was infrequent at the end of the intervention (1/1147) and follow up (8/627). No dependence data were reported. Diverse disability measures made meta-analysis difficult; the majority of effect sizes were not significant. Cardiorespiratory training involving walking, improved maximum walking speed (mean difference (MD) 6.47 metres per minute, 95% confidence interval (CI) 2.37 to 10.57), walking endurance (MD 38.9 metres per six minutes, 95% CI 14.3 to 63.5), and reduced dependence during walking (Functional Ambulation Categories MD 0.72, 95% CI 0.46 to 0.98). Current data include few strength training trials, and lack non-exercise attention controls, long-term training and follow up. AUTHORS' CONCLUSIONS The effects of training on death, dependence and disability after stroke are unclear. There is sufficient evidence to incorporate cardiorespiratory training, involving walking, within post-stroke rehabilitation in order to improve speed, tolerance and independence during walking. Further trials are needed to determine the optimal exercise prescription after stroke and identify any long-term benefits.
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Affiliation(s)
- David H Saunders
- Department of Physical Education Sport and Leisure Studies, University of Edinburgh, St Leonards Land, Holyrood Road, Edinburgh, Midlothian, UK, EH8 2AZ
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Chodzko-Zajko WJ, Proctor DN, Fiatarone Singh MA, Minson CT, Nigg CR, Salem GJ, Skinner JS, Skinner JS. Exercise and Physical Activity for Older Adults. Med Sci Sports Exerc 2009; 41:1510-30. [PMID: 19516148 DOI: 10.1249/mss.0b013e3181a0c95c] [Citation(s) in RCA: 2362] [Impact Index Per Article: 157.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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Paterson DH, Jones GR, Rice CL. [Aging and physical activity data on which to base recommendations for exercise in older adults]. Appl Physiol Nutr Metab 2009; 32 Suppl 2F:S75-S171. [PMID: 19377547 DOI: 10.1139/h07-165] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
An abundance of epidemiological research confirms the benefits of physical activity in reducing risk of various age-related morbidities and all-cause mortality. Analysis of the literature focusing on key exercise variables (e.g., intensity, type, and volume) suggests that the requisite beneficial amount of activity is that which engenders improved cardiorespiratory fitness, strength, power, and, indirectly, balance. Age-related declines in these components are such that physical limitations impinge on functional activities of daily living. However, an exercise programme can minimize declines, thus preventing older adults (age 65+ years) from crossing functional thresholds of inability. Cross-sectional and longitudinal data demonstrate that cardiorespiratory fitness is associated with functional capacity and independence; strength and, importantly, power are related to performance and activities of daily living; and balance-mobility in combination with power are important factors in preventing falls. Exercise interventions have documented that older adults can adapt physiologically to exercise training, with gains in functional capacities. The few studies that have explored minimal or optimal activity requirements suggest that a threshold (intensity) within the moderately vigorous domain is needed to achieve and preserve related health benefits. Thus, physical activity and (or) exercise prescriptions should emphasize activities of the specificity and type to improve components related to the maintenance of functional capacity and independence; these will also delay morbidity and mortality. An appropriate recommendation for older adults includes moderately vigorous cardiorespiratory activities (e.g., brisk walking), strength and (or) power training for maintenance of muscle mass and specific muscle-group performance, as well as "balance-mobility practice" and flexibility (stretching) exercise as needed.
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Affiliation(s)
- Donald H Paterson
- Centre canadien pour l'activité et le vieillissement, Université Western Ontario, 1490, rue Richmond N., Londres, ON N6G 2M3, Canada.
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Roig M, Eng JJ, Road JD, Reid WD. Falls in patients with chronic obstructive pulmonary disease: a call for further research. Respir Med 2009; 103:1257-69. [PMID: 19419852 DOI: 10.1016/j.rmed.2009.03.022] [Citation(s) in RCA: 85] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/14/2009] [Accepted: 03/31/2009] [Indexed: 12/25/2022]
Abstract
Chronic obstructive pulmonary disease (COPD) is a respiratory disease that results in airflow limitation and respiratory distress. The effects of COPD, however, are not exclusively limited to respiratory function and people with COPD face many non-respiratory manifestations that affect both function and mobility. Deficits in function and mobility have been associated with an increased risk for falling in older adults. The purpose of this study was to provide a theoretical framework to identify risks factors for falls in people with COPD. We have analyzed the literature to identify possible relationships between pathophysiological changes observed in COPD and common risk factors for falls. Well-established fall risk factors in people with COPD include lower limb muscle weakness and impaired activities of daily living. Other intrinsic risk factors such as gait and balance deficits, nutritional depletion, malnutrition, depression, cognitive impairments and medications are possible risk factors that need to be confirmed with more studies. There is no evidence that visual deficits are common in COPD. The role that precipitating factors such as syncope and postural hypotension may have on fall risk is unclear. Exacerbations and dyspnea do not have a precipitating effect on fall risk but they contribute to the progressive physical deterioration that may theoretically increase the risk for falls. While these results suggest that people with COPD might have an increased susceptibility to fall compared to their healthy peers, further research is needed to determine the prevalence of falls and specific risk factors for falls in people living with COPD.
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Affiliation(s)
- Marc Roig
- Department of Physical Therapy, University of British Columbia, 828 West 10th Avenue, Vancouver, Canada.
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Abstract
OBJECTIVE Physical inactivity in an aging population is a major contributing factor to the rising numbers of older persons with chronic illnesses and disabilities. The purpose of this article is to review the relationship between physical inactivity and age-associated changes to the cardiovascular system, and provide guidance on prescribing exercise to healthy older persons in order to mitigate the adverse effects of cardiovascular aging. DESIGN Interpretive review of the literature. RESULTS A number of structural and functional changes occur in the cardiovascular system with advancing age, many of which are mediated by changes in vascular stiffness. These changes lead not only to cardiovascular events and strokes, but also to frailty, functional decline, and cognitive impairment. A substantial proportion of the decline in aerobic capacity with age may result from physical inactivity. Guidelines for the prescription of aerobic, resistance, and balance training for otherwise healthy older persons are provided. CONCLUSIONS Lack of physical activity is a major risk factor for the epidemic of chronic disease and disability facing an aging population. Many age-associated changes in cardiovascular function result from physical inactivity. The benefits of regular exercise include prevention of cardiovascular events, disability, and cognitive impairment. Age is not a contraindication to exercise, which can usually be initiated safely in older persons.
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Functional outcomes for clinical trials in frail older persons: time to be moving. J Gerontol A Biol Sci Med Sci 2008; 63:160-4. [PMID: 18314451 DOI: 10.1093/gerona/63.2.160] [Citation(s) in RCA: 118] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Henwood TR, Riek S, Taaffe DR. Strength versus muscle power-specific resistance training in community-dwelling older adults. J Gerontol A Biol Sci Med Sci 2008; 63:83-91. [PMID: 18245765 DOI: 10.1093/gerona/63.1.83] [Citation(s) in RCA: 160] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
BACKGROUND Loss of muscle power due to normal aging has greater functional impact than loss of strength alone. The present study compared two resistance training programs, one aimed at enhancing muscle power and one at increasing muscle strength, on muscle function and functional performance in older adults. METHODS Sixty-seven healthy, independent older adults (65-84 years) were randomized to a high-velocity varied resistance (HV), constant resistance (ST), or nontraining control (CO) group. Participants trained twice weekly for 24 weeks using six exercises. Dynamic and isometric muscle strength, muscle power, movement velocity, muscle endurance, and a battery of functional performance tasks were assessed. Secondary outcomes included body composition, quality of life, and balance confidence. RESULTS Muscle strength increased significantly (p <.001) and similarly in the training groups compared to controls (HV, 51.0 +/- 9.0%; ST, 48.3 +/- 6.8%; CO, 1.2 +/- 5.1%). Peak muscle power also increased with training (p <.05), with no difference between training groups. The change in peak power was 50.5 +/- 4.1%, 33.8 +/- 3.8%, and -2.5 +/- 3.9% in the HV, ST, and CO groups, respectively. Training also improved selected functional performance tasks in the HV and ST groups compared to controls (p <.05), and the HV group reported improved quality of life (p =.018). CONCLUSION Muscle power and muscle strength improved similarly using either resistance training protocol, and these changes were accompanied by improvements in several functional performance tasks. However, improvements in the HV group occurred with less total work performed per training session.
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Affiliation(s)
- Tim R Henwood
- School of Human Movement Studies, The University of Queensland, Brisbane, Queensland, Australia.
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Caserotti P, Aagaard P, Larsen JB, Puggaard L. Explosive heavy-resistance training in old and very old adults: changes in rapid muscle force, strength and power. Scand J Med Sci Sports 2008; 18:773-82. [PMID: 18248533 DOI: 10.1111/j.1600-0838.2007.00732.x] [Citation(s) in RCA: 162] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Age-related decline in muscle power predicts falls, motor impairments and disability. Recent guidelines suggested that training programs should be tailored to maximize muscle power. This study investigated the effects of 12 weeks of explosive-type heavy-resistance training (75-80% of 1 repetition maximum) in old (60-65 years, TG60) and very old (80-89 years, TG80) community-dwelling women. Training was performed with maximal intentional acceleration of the training load during the concentric movement phase. Maximal isometric voluntary muscle strength (MVC), rapid force capacity, assessed as rate of force development (RFD), and impulse, maximal muscle power during a countermovement jump (CMJ) and during unilateral leg extension task (LEP) were evaluated. RFD, impulse and MVC increased by 51%, 42% and 28% in TG80, and by 21%, 18% and 18% in TG60, respectively. CMJ jump height increased by 18% and 10% in TG80 and TG60, respectively, while jump peak power increased in TG60 (5%). Finally, LEP increased 28% in TG80 and 12% in TG60. These findings demonstrate that explosive-type heavy-resistance training seems to be safe and well tolerated in healthy women even in the eighth decade of life and elicits adaptive neuromuscular changes in selected physiological variables that are commonly associated with the risk of falls and disability in aged individuals.
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Affiliation(s)
- P Caserotti
- Centre of Applied and Clinical Exercise Sciences (ACES), University of Southern Denmark, Odense, Denmark.
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Caserotti P, Aagaard P, Puggaard L. Changes in power and force generation during coupled eccentric–concentric versus concentric muscle contraction with training and aging. Eur J Appl Physiol 2008; 103:151-61. [DOI: 10.1007/s00421-008-0678-x] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/06/2008] [Indexed: 11/25/2022]
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The Feasibility of Measuring Joint Angular Velocity With a Gyro-Sensor. Arch Phys Med Rehabil 2008; 89:95-9. [DOI: 10.1016/j.apmr.2007.07.051] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2007] [Revised: 07/09/2007] [Accepted: 07/11/2007] [Indexed: 11/19/2022]
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Paterson DH, Jones GR, Rice CL. Ageing and physical activity: evidence to develop exercise recommendations for older adultsThis article is part of a supplement entitled Advancing physical activity measurement and guidelines in Canada: a scientific review and evidence-based foundation for the future of Canadian physical activity guidelines co-published by Applied Physiology, Nutrition, and Metabolism and the Canadian Journal of Public Health. It may be cited as Appl. Physiol. Nutr. Metab. 32(Suppl. 2E) or as Can. J. Public Health 98(Suppl. 2). Appl Physiol Nutr Metab 2007. [DOI: 10.1139/h07-111] [Citation(s) in RCA: 102] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
An abundance of epidemiological research confirms the benefits of physical activity in reducing risk of various age-related morbidities and all-cause mortality. Analysis of the literature focusing on key exercise variables (e.g., intensity, type, and volume) suggests that the requisite beneficial amount of activity is that which engenders improved cardiorespiratory fitness, strength, power, and, indirectly, balance. Age-related declines in these components are such that physical limitations impinge on functional activities of daily living. However, an exercise programme can minimize declines, thus preventing older adults (age 65+ years) from crossing functional thresholds of inability. Cross-sectional and longitudinal data demonstrate that cardiorespiratory fitness is associated with functional capacity and independence; strength and, importantly, power are related to performance and activities of daily living; and balance-mobility in combination with power are important factors in preventing falls. Exercise interventions have documented that older adults can adapt physiologically to exercise training, with gains in functional capacities. The few studies that have explored minimal or optimal activity requirements suggest that a threshold (intensity) within the moderately vigorous domain is needed to achieve and preserve related health benefits. Thus, physical activity and (or) exercise prescriptions should emphasize activities of the specificity and type to improve components related to the maintenance of functional capacity and independence; these will also delay morbidity and mortality. An appropriate recommendation for older adults includes moderately vigorous cardiorespiratory activities (e.g., brisk walking), strength and (or) power training for maintenance of muscle mass and specific muscle-group performance, as well as “balance-mobility practice” and flexibility (stretching) exercise as needed.
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Affiliation(s)
- Donald H. Paterson
- Canadian Centre for Activity and Aging, University of Western Ontario, 1490 Richmond Street N., London, ON N6G 2M3, Canada
- School of Kinesiology, Faculty of Health Sciences, Room 411B, Health Sciences Building, University of Western Ontario, London, ON N6A 5B9, Canada
- Occupational Therapy, Faculty of Health Sciences, University of Western Ontario, London, ON N6A 5B9, Canada
| | - Gareth R. Jones
- Canadian Centre for Activity and Aging, University of Western Ontario, 1490 Richmond Street N., London, ON N6G 2M3, Canada
- School of Kinesiology, Faculty of Health Sciences, Room 411B, Health Sciences Building, University of Western Ontario, London, ON N6A 5B9, Canada
- Occupational Therapy, Faculty of Health Sciences, University of Western Ontario, London, ON N6A 5B9, Canada
| | - Charles L. Rice
- Canadian Centre for Activity and Aging, University of Western Ontario, 1490 Richmond Street N., London, ON N6G 2M3, Canada
- School of Kinesiology, Faculty of Health Sciences, Room 411B, Health Sciences Building, University of Western Ontario, London, ON N6A 5B9, Canada
- Occupational Therapy, Faculty of Health Sciences, University of Western Ontario, London, ON N6A 5B9, Canada
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Puthoff ML, Nielsen DH. Relationships among impairments in lower-extremity strength and power, functional limitations, and disability in older adults. Phys Ther 2007; 87:1334-47. [PMID: 17684086 DOI: 10.2522/ptj.20060176] [Citation(s) in RCA: 147] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
BACKGROUND AND PURPOSE During the aging process, older adults may experience a loss of strength and power, which then may lead to functional limitations and disability. The purpose of this study was to examine how impairments in lower-extremity strength and power are related to functional limitations and disability in community-dwelling older adults. SUBJECTS Thirty older adults (age [X+/-SD], 77.3+/-7.0 years; 25 women and 5 men) with mild to moderate functional limitations participated in this study. METHODS Lower-extremity strength, peak power, power at a low relative intensity, and power at a high relative intensity were measured with a pneumatic resistance leg press. Functional limitations and disability were assessed with the Short Physical Performance Battery (SPPB), the Six-Minute Walk Test (SMWT), and the Late Life Function and Disability Instrument (LLFDI). RESULTS All measures of strength and power were related to functional limitations. Peak power demonstrated the strongest relationships with SMWT, the SPPB gait speed subscale, and the LLFDI functional limitation component. Power at a high relative intensity demonstrated the strongest relationships to the SPPB total score and the SPPB sit-to-stand subscale score. All measures of strength and power were indirectly related to the LLFDI disability component. DISCUSSION AND CONCLUSION Older adults should focus on increasing and maintaining lower-extremity strength and power across a range of intensities in order to decrease functional limitations and disability.
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Affiliation(s)
- Michael L Puthoff
- Physical Therapy Department, St Ambrose University, 518 W Locust St, Davenport, IA 52803, USA.
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Bean JF, Kiely DK, LaRose S, Alian J, Frontera WR. Is stair climb power a clinically relevant measure of leg power impairments in at-risk older adults? Arch Phys Med Rehabil 2007; 88:604-9. [PMID: 17466729 DOI: 10.1016/j.apmr.2007.02.004] [Citation(s) in RCA: 177] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
OBJECTIVE To test the clinical relevance of the stair climb power test (SCPT) as a measure of leg power impairments in mobility-limited older adults. DESIGN Cross-sectional analysis of baseline data from participants within a randomized controlled trial. SETTING Rehabilitation research gym. PARTICIPANTS Community-dwelling older adults (N=138; mean age, 75.4 y) with mobility limitations as defined by the Short Physical Performance Battery (SPPB). INTERVENTIONS Not applicable. MAIN OUTCOME MEASURES Leg power measures included the SCPT and double leg press power measured at 40% (DLP40) and 70% (DLP70) of the 1 repetition maximum. Mobility performance tests included the SPPB and its 3 components: gait speed, chair stand time, and standing balance. RESULTS Stair climb power per kilogram (SCP/kg) had correlations of moderate strength (r=.47, r=.52) with DLP40/kg and DLP70/kg, respectively. All 3 leg power measures correlated with each of the mobility performance measures with the exception of DLP40/kg (r=.11, P=.27) and DLP70/kg (r=.11, P=.18) with standing balance. Magnitudes of association, as described by the Pearson correlation coefficient, did not differ substantively among the separate power measures as they related to SPPB performance overall. Separate adjusted multivariate models evaluating the relationship between leg power and SPPB performance were all statistically significant and described equivalent amounts of the total variance (R(2)) in SPPB performance (SCP/kg, R(2)=.30; DLP40, R(2)=.32; DLP70, R(2)=.31). Analyses of the components of the SPPB show that the SCPT had stronger associations than the other leg power impairment measures with models predicting chair stand (SCP/kg, R(2)=.25; DLP40, R(2)=.12; DLP70, R(2)=.13), whereas both types of leg press power testing had stronger associations with models predicting gait speed (SCP/kg, R(2)=.16; DLP40, R(2)=.34; DLP70, R(2)=.34). Stair climb power was the only power measure that was a significant component of models predicting standing balance (SCP/kg R(2)=.20). CONCLUSIONS The SCPT is a clinically relevant measure of leg power impairments. It is associated with more complex modes of testing leg power impairments and is meaningfully associated with mobility performance, making it suitable for clinical settings in which impairment-mobility relationships are of interest.
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Affiliation(s)
- Jonathan F Bean
- Department of PM&R, Harvard Medical School, Boston, MA, USA.
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Petrella JK, Kim JS, Tuggle SC, Bamman MM. Contributions of force and velocity to improved power with progressive resistance training in young and older adults. Eur J Appl Physiol 2006; 99:343-51. [PMID: 17165058 DOI: 10.1007/s00421-006-0353-z] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/09/2006] [Indexed: 10/23/2022]
Abstract
We investigated the effects of age on changes in the force and velocity components of knee extension (KE) power during 16 weeks of traditional progressive resistance training (PRT). Thirty-one young (27 +/- 1 years, 16 men, 15 women) and 30 older (64 +/- 1 years, 14 men, 16 women) adults trained by KE, leg press, and squat 3 days/week. PRT consisted of three sets with an appropriate load for 8-12 repetitions to fatigue. Testing occurred at baseline, 8, and 16 weeks. Thigh lean mass (TLM) was measured by DEXA. KE load-power and load-velocity curves were generated from peak concentric contractions against loads equivalent to 20, 30, 40, 50, and 60% maximum voluntary isometric contraction (MVC) force. Quadriceps neural activation relative to maximum was assessed during a sit-to-stand task. Participants increased KE 1RM (P < 0.05) by 8 weeks with young adults also increasing strength from 8 to 16 weeks. Adjusting for TLM, all groups increased KE specific strength (P < 0.05). MVC improved by 8 weeks in older adults and by 16 weeks in young subjects (P < 0.05). Neural activation requirements during standing and sitting declined in older adults by 8 weeks (P < 0.05). The KE load-power curve improved for all groups (P < 0.05) by 8 weeks with only young adults improving from 8 to 16 weeks. Peak concentric velocity increased only in older adults (P < 0.05). Training improvements in power resulted primarily from increases in strength both early and late for young adults while older adults realized early improvements in both strength and peak concentric velocity.
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Affiliation(s)
- John K Petrella
- Muscle Research Laboratory, UAB Department of Physiology and Biophysics, GRECC/11G VA Medical Center, The University of Alabama at Birmingham, Birmingham, AL 35294-0001, USA
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