PMID- 35837015
OWN - NLM
STAT- PubMed-not-MEDLINE
LR  - 20220716
IS  - 1664-042X (Print)
IS  - 1664-042X (Electronic)
IS  - 1664-042X (Linking)
VI  - 13
DP  - 2022
TI  - Not Lower-Limb Joint Strength and Stiffness but Vertical Stiffness and Isometric 
      Force-Time Characteristics Correlate With Running Economy in Recreational Male 
      Runners.
PG  - 940761
LID - 10.3389/fphys.2022.940761 [doi]
LID - 940761
AB  - Neuromuscular characteristics, such as lower-limb joint strength, the ability to 
      reuse elastic energy, and to generate force are essential factors influencing 
      running performance. However, their relationship with running economy (RE) 
      remains unclear. The aim of this study was to evaluate the correlations between 
      isokinetic lower-limb joint peak torque (PT), lower-limb stiffness, isometric 
      force-time characteristics and RE among recreational-trained male runners. Thirty 
      male collegiate runners (aged 20-22 years, VO(2max): 54.02 +/- 
      4.67 ml.kg(-1).min(-1)) participated in test sessions on four separate days. In 
      the first session, the body composition and RE at 10 km.h(-1) were determined. In 
      the second session, leg and vertical stiffness (K(leg) and K(vert)), knee and 
      ankle stiffness (K(knee) and K(ankle)) were evaluated. In the third session, 
      isokinetic knee and ankle joint PT at velocity of 60 degrees s(-1) were tested. The 
      force-time characteristics of isometric mid-thigh pull (IMTP) were evaluated in 
      the final session. The Pearson's product-moment correlations analysis shows that 
      there were no significant relationships between knee and ankle joint concentric 
      and eccentric PT, K(knee) and K(ankle), K(leg), and RE at 10 km.h(-1). However, 
      K(vert) (r = -0.449, p < 0.05) and time-specific rate of force development (RFD) 
      for IMTP from 0 to 50 to 0-300 ms (r = -0.434 to -0.534, p < 0.05) were 
      significantly associated with RE. Therefore, superior RE in recreational runners 
      may not be related to knee and ankle joint strength and stiffness. It seems to be 
      associated with vertical stiffness and the capacity to rapidly produce force 
      within 50-300 ms throughout the lower limb.
CI  - Copyright (c) 2022 Zhang, Nassis, Chen, Shi and Li.
FAU - Zhang, Qin
AU  - Zhang Q
AD  - School of Physical Education and Sport Training, Shanghai University of Sport, 
      Shanghai, China.
FAU - Nassis, George P
AU  - Nassis GP
AD  - Physical Education Department, College of Education, United Arab Emirates 
      University, Al Ain, United Arab Emirates.
AD  - Department of Sports Science and Clinical Biomechanics, SDU Sport and Health 
      Sciences Cluster (SHSC), University of Southern Denmark, Odense, Denmark.
FAU - Chen, Shiqin
AU  - Chen S
AD  - School of Physical Education and Sport Training, Shanghai University of Sport, 
      Shanghai, China.
FAU - Shi, Yue
AU  - Shi Y
AD  - School of Kinesiology, Shanghai University of Sport, Shanghai, China.
FAU - Li, Fei
AU  - Li F
AD  - School of Physical Education and Sport Training, Shanghai University of Sport, 
      Shanghai, China.
LA  - eng
PT  - Journal Article
DEP - 20220628
PL  - Switzerland
TA  - Front Physiol
JT  - Frontiers in physiology
JID - 101549006
PMC - PMC9273997
OTO - NOTNLM
OT  - eccentric strength
OT  - isometric mid-thigh pull
OT  - neuromuscular characteristics
OT  - recreational runner
OT  - running performance
OT  - stiffness
COIS- The authors declare that the research was conducted in the absence of any 
      commercial or financial relationships that could be construed as a potential 
      conflict of interest.
EDAT- 2022/07/16 06:00
MHDA- 2022/07/16 06:01
PMCR- 2022/06/28
CRDT- 2022/07/15 02:33
PHST- 2022/05/10 00:00 [received]
PHST- 2022/06/13 00:00 [accepted]
PHST- 2022/07/15 02:33 [entrez]
PHST- 2022/07/16 06:00 [pubmed]
PHST- 2022/07/16 06:01 [medline]
PHST- 2022/06/28 00:00 [pmc-release]
AID - 940761 [pii]
AID - 10.3389/fphys.2022.940761 [doi]
PST - epublish
SO  - Front Physiol. 2022 Jun 28;13:940761. doi: 10.3389/fphys.2022.940761. eCollection 
      2022.