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Effects of 14 days of bed rest and following physical training on metabolic cost, mechanical work, and efficiency during walking in older and young healthy males

Floreani, M. and Rejc, E. and Taboga, P. and Ganzini, A. and Pisot, R. and Simunic, B. and Biolo, G. and Reggiani, C. and Passaro, A. and Narici, M. and Rittweger, Jörn and di Prampero, P. and Lazzer, S. (2018) Effects of 14 days of bed rest and following physical training on metabolic cost, mechanical work, and efficiency during walking in older and young healthy males. PLoS One, 13 (3), pp. 1-18. Public Library of Science (PLoS). DOI: 10.1371/journal.pone.0194291 ISBN PMID 29529070 ISSN 1932-6203

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Abstract

In this study, we investigated: i) the effects of bed rest and a subsequent physical training program on metabolic cost (Cw), mechanical work and efficiency during walking in older and young men; ii) the mechanisms underlying the higher Cw observed in older than young men.Twenty-three healthy male subjects (N = 16 older adults, age 59.6±3.4 years; N = 7 young, age: 23.1±2.9 years) participated in this study. The subjects underwent 14 days of bed rest followed by two weeks of physical training (6 sessions). Cw, mechanical work, efficiency, and co-contraction time of proximal muscles (vastus lateralis and biceps femoris) and distal muscles (gastrocnemius medialis and tibialis anterior) were measured during walking at 0.83, 1.11, 1.39, 1.67 m·s⁻¹ before bed rest (pre-BR), after bed rest (post-BR) and after physical training (post-PT).No effects of bed rest and physical training were observed on the analysed parameters in either group. Older men showed higher Cw and lower efficiency at each speed (average +25.1 and -20.5%, P<0.001, respectively) compared to young. Co-contraction time of proximal and distal muscles were higher in older than in young men across the different walking speeds (average +30.0 and +110.3%, P<0.05, respectively).The lack of bed rest and physical training effects on the parameters analyzed in this study may be explained by the healthy status of both young and older men, which could have mitigated the effects of these interventions on walking motor function. On the other hand, the fact that older adults showed greater Cw, overall higher co-contraction time of antagonist lower limb muscles, and lower efficiency compared to the young cohort throughout a wide range of walking speed may suggest that older adults sacrificed economy of walking to improve stability.

Item URL in elib:https://elib.dlr.de/119330/
Document Type:Article
Title:Effects of 14 days of bed rest and following physical training on metabolic cost, mechanical work, and efficiency during walking in older and young healthy males
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Floreani, M.UNSPECIFIEDUNSPECIFIED
Rejc, E.UNSPECIFIEDUNSPECIFIED
Taboga, P.UNSPECIFIEDUNSPECIFIED
Ganzini, A.UNSPECIFIEDUNSPECIFIED
Pisot, R.University of PrimorskaUNSPECIFIED
Simunic, B.University of PrimorskaUNSPECIFIED
Biolo, G.UNSPECIFIEDUNSPECIFIED
Reggiani, C.University of Padua, ItalyUNSPECIFIED
Passaro, A.UNSPECIFIEDUNSPECIFIED
Narici, M.Manchester Metropolitan University, U.K.UNSPECIFIED
Rittweger, JörnJoern.Rittweger (at) dlr.dehttps://orcid.org/0000-0002-2223-8963
di Prampero, P.University of Udine, ItalyUNSPECIFIED
Lazzer, S.University of Udine, ItalyUNSPECIFIED
Date:12 March 2018
Journal or Publication Title:PLoS One
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:13
DOI :10.1371/journal.pone.0194291
Page Range:pp. 1-18
Publisher:Public Library of Science (PLoS)
ISSN:1932-6203
ISBN:PMID 29529070
Status:Published
Keywords:bed rest; metabolic cost; physical training;
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Research under Space Conditions
DLR - Research area:Raumfahrt
DLR - Program:R FR - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):R - Vorhaben Systemphysiologie
Location: Köln-Porz
Institutes and Institutions:Institute of Aerospace Medicine > Muscle and Bone Metabolism
Institute of Aerospace Medicine > Cardiovascular Medicine in Aerospace
Deposited By: Polak, Agnieszka
Deposited On:14 Mar 2018 11:09
Last Modified:01 Dec 2018 19:53

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