In the original article, there was an error in citing a paper concerning the impact of physical activity on motoneuron survival: Dranseika et al. (2016) was cited instead of Piasecki et al. (2016). A correction has been made to second paragraph of the Introduction, which reads as follows:
The conundrum of greatly diminished muscle size and function, while individual muscle fiber size and function are preserved, may potentially be explained by a loss of muscle fibers. In this respect, the neural system plays a pivotal role. Initially, with progressive motoneuron death and fiber denervation, and, then, by the disappearance of the denervated fibers or, possibly, by partial reinnervation of the surviving fibers by sprouting of slow motoneurons (Delbono, 2003, 2011; Payne and Delbono, 2004; Aagaard et al., 2010; Reid et al., 2012; Venturelli et al., 2018). Interestingly, it is still debated whether the loss of motoneurons can be slowed down by regular physical activity [see Power et al. (2010) in favor and Piasecki et al. (2016) against this view]. Unfortunately, the direct assessment of the impact of neural events on muscle fiber size and number during advanced age and disuse is somewhat complicated (Doherty et al., 1993). However, the comparison between the force developed during maximal voluntary contraction (MVC) and electrically stimulated contraction helps to estimate the contribution of reduced neural drive to muscle deconditioning (Venturelli et al., 2015). Furthermore, the evaluation of in vivo single twitch kinetics may further contribute to understand the functional condition of skeletal muscle, as the maximal rates of force development are clearly different among slow and fast motor units (Mero et al., 1991). Unfortunately, information regarding single twitch kinetics in the oldest-old is sparse.
The authors apologize for this error and state that this does not change the scientific conclusions of the article in any way. The original article has been updated.
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Summary
Keywords
aging, oldest-old, physical activity, muscle atrophy, single muscle fibers, myonuclei, gene expression
Citation
Naro F, Venturelli M, Monaco L, Toniolo L, Muti E, Milanese C, Zhao J, Richardson RS, Schena F and Reggiani C (2020) Corrigendum: Skeletal Muscle Fiber Size and Gene Expression in the Oldest-Old With Differing Degrees of Mobility. Front. Physiol. 11:127. doi: 10.3389/fphys.2020.00127
Received
06 January 2020
Accepted
06 February 2020
Published
25 February 2020
Volume
11 - 2020
Edited and reviewed by
Bradley Elliott, University of Westminster, United Kingdom
Updates
Copyright
© 2020 Naro, Venturelli, Monaco, Toniolo, Muti, Milanese, Zhao, Richardson, Schena and Reggiani.
This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Carlo Reggiani carlo.reggiani@unipd.it
This article was submitted to Striated Muscle Physiology, a section of the journal Frontiers in Physiology
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