Universität zu Köln

Floreani, Mirco ORCID: 0000-0002-4417-9597, Rejc, Enrico, Taboga, Paolo, Ganzini, Alessandro, Pisot, Rado, Simunic, Bostjan, Biolo, Gianni, Reggiani, Carlo, Passaro, Angelina ORCID: 0000-0001-8462-7000, Narici, Marco, Rittweger, Joern, di Prampero, Pietro Enrico and Lazzer, Stefano (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). SAN FRANCISCO: PUBLIC LIBRARY SCIENCE. 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 Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Floreani, Mirco UNSPECIFIED orcid.org/0000-0002-4417-9597 UNSPECIFIED Rejc, Enrico UNSPECIFIED UNSPECIFIED UNSPECIFIED Taboga, Paolo UNSPECIFIED UNSPECIFIED UNSPECIFIED Ganzini, Alessandro UNSPECIFIED UNSPECIFIED UNSPECIFIED Pisot, Rado UNSPECIFIED UNSPECIFIED UNSPECIFIED Simunic, Bostjan UNSPECIFIED UNSPECIFIED UNSPECIFIED Biolo, Gianni UNSPECIFIED UNSPECIFIED UNSPECIFIED Reggiani, Carlo UNSPECIFIED UNSPECIFIED UNSPECIFIED Passaro, Angelina UNSPECIFIED orcid.org/0000-0001-8462-7000 UNSPECIFIED Narici, Marco UNSPECIFIED UNSPECIFIED UNSPECIFIED Rittweger, Joern UNSPECIFIED UNSPECIFIED UNSPECIFIED di Prampero, Pietro Enrico UNSPECIFIED UNSPECIFIED UNSPECIFIED Lazzer, Stefano UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-192845
DOI:	10.1371/journal.pone.0194291
Journal or Publication Title:	PLoS One
Volume:	13
Number:	3
Date:	2018
Publisher:	PUBLIC LIBRARY SCIENCE
Place of Publication:	SAN FRANCISCO
ISSN:	1932-6203
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language FUNCTIONAL IMPAIRMENT; HINDLIMB SUSPENSION; LEVEL WALKING; MUSCLE VOLUME; BODY-MASS; ADULTS; GAIT; BALANCE; AGE; MEN Multiple languages Multidisciplinary Sciences Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/19284