scholarly journals Neuromuscular, biomechanical, and energetic adjustments following repeated bouts of downhill running

2021 ◽  
Author(s):  
Arash Khassetarash ◽  
Gianluca Vernillo ◽  
Renata L. Krüger ◽  
W. Brent Edwards ◽  
Guillaume Y. Millet
Keyword(s):  
Downhill Running

Downhill Running to Enhance Operational Performance in Mountain Terrains: Report No. 94-36

1994 ◽  
Author(s):  
P. G. Law ◽  
H. W. Goforth ◽  
W. K. Prusaczyk ◽  
T. Sopchick-Smith ◽  
A. C. Vailas
Keyword(s):  
Operational Performance ◽  
Downhill Running ◽  
Mountain Terrains

Lateral Extra-articular Tenodesis Contributes Little to Change In Vivo Kinematics After Anterior Cruciate Ligament Reconstruction: A Randomized Controlled Trial

2021 ◽  
pp. 036354652110032
Author(s):  
Daisuke Chiba ◽  
Tom Gale ◽  
Kyohei Nishida ◽  
Felipe Suntaxi ◽  
Bryson P. Lesniak ◽  
...  
Keyword(s):  
Anterior Cruciate Ligament ◽  
Cruciate Ligament ◽  
P Value ◽  
In Vivo Kinematics ◽  
Acl Deficiency ◽  
Downhill Running ◽  
Value Range ◽  
Foot Strike ◽  
Anterior Cruciate

Background: Lateral extra-articular tenodesis (LET) in combination with anterior cruciate ligament (ACL) reconstruction (ACLR) has been proposed to improve residual rotatory knee instability in patients having ACL deficiency. Purpose/Hypothesis: The purpose was to compare the effects of isolated ACLR (iACLR) versus LET in combination with ACLR (ACLR+LET) on in vivo kinematics during downhill running. It was hypothesized that ACLR+LET would reduce the internal rotation of the reconstructed knee in comparison with iACLR. Study Design: Controlled laboratory study. Methods: A total of 18 patients with ACL deficiency were included. All participants were randomly assigned to receive ACLR+ LET or iACLR during surgery. Six months and 12 months after surgery, knee joint motion during downhill running was measured using dynamic biplane radiography and a validated registration process that matched patient-specific 3-dimensional bone models to synchronized biplane radiographs. Anterior tibial translation (ATT; positive value means “anterior translation”) and tibial rotation (TR) relative to the femur were calculated for both knees. The side-to-side differences (SSDs) in kinematics were also calculated (operated knee–contralateral healthy knee). The SSD value was compared between ACLR+LET and iACLR groups using a Mann-Whitney U test. Results: At 6 months after surgery, the SSD of ATT in patients who had undergone ACLR+LET (–1.9 ± 2.0 mm) was significantly greater than that in patients who had undergone iACLR (0.9 ± 2.3 mm) at 0% of the gait cycle (foot strike) ( P = .031). There was no difference in ATT 12 months after surgery. Regarding TR, there were no differences between ACLR+LET and iACLR at either 6 months ( P value range, .161-.605) or 12 months ( P value range, .083-.279) after surgery. Conclusion: LET in combination with ACLR significantly reduced ATT at the instant of foot strike during downhill running at 6 months after surgery. However, this effect was not significant at 12 months after surgery. The addition of LET to ACLR had no effect on TR at both 6 and 12 months after surgery. Clinical Relevance: LET in combination with ACLR may stabilize sagittal knee motion during downhill running in the early postoperation phase, but according to this study, it has no effect on 12-month in vivo kinematics. Registration: NCT02913404 ( ClinicalTrials.gov identifier)

Changes in running economy at different intensities following downhill running

2009 ◽  
Vol 27 (11) ◽  
pp. 1137-1144 ◽  
Author(s):  
Trevor C. Chen ◽  
Kazunori Nosaka ◽  
Ming-Ju Lin ◽  
Hsin-Lian Chen ◽  
Chang-Jun Wu
Keyword(s):  
Running Economy ◽  
Downhill Running

Impact of Downhill Running on Proteasome Content in Mouse Skeletal Muscle

2017 ◽  
Vol 49 (5S) ◽  
pp. 499-500
Author(s):  
Cory W. Baumann ◽  
Dongmin Kwak ◽  
Deborah A. Ferrington ◽  
LaDora V. Thompson
Keyword(s):  
Skeletal Muscle ◽  
Mouse Skeletal Muscle ◽  
Downhill Running

Level, uphill and downhill running economy values are strongly inter-correlated

2018 ◽  
Vol 119 (1) ◽  
pp. 257-264 ◽  
Author(s):  
Timothy Joseph Breiner ◽  
Amanda Louise Ryan Ortiz ◽  
Rodger Kram
Keyword(s):  
Running Economy ◽  
Downhill Running

Relationship between fat-to-fat-free mass ratio and decrements in leg strength after downhill running

2001 ◽  
Vol 90 (4) ◽  
pp. 1334-1341 ◽  
Author(s):  
R. C. Hickner ◽  
P. M. Mehta ◽  
D. Dyck ◽  
P. Devita ◽  
J. A. Houmard ◽  
...  
Keyword(s):  
Body Mass ◽  
Muscle Glycogen ◽  
Linear Regression Analysis ◽  
Multiple Linear Regression Analysis ◽  
Fat Free Mass ◽  
Mass Ratio ◽  
Low Fat ◽  
Cross Sectional ◽  
Leg Strength ◽  
Downhill Running

The purpose of this study was to determine whether greater body fat mass (FM) relative to lean mass would result in more severe muscle damage and greater decrements in leg strength after downhill running. The relationship between the FM-to-fat-free mass ratio (FM/FFM) and the strength decline resulting from downhill running (−11% grade) was investigated in 24 male runners [age 23.4 ± 0.7 (SE) yr]. The runners were divided into two groups on the basis of FM/FFM: low fat (FM/FFM = 0.100 ± 0.008, body mass = 68.4 ± 1.3 kg) and normal fat (FM/FFM = 0.233 ± 0.020, body mass = 76.5 ± 3.3 kg, P < 0.05). Leg strength was reduced less in the low-fat (−0.7 ± 1.3%) than in the normal-fat individuals (−10.3 ± 1.5%) 48 h after, compared with before, downhill running ( P < 0.01). Multiple linear regression analysis revealed that the decline in strength could be predicted best by FM/FFM ( r2= 0.44, P < 0.05) and FM-to-thigh lean tissue cross-sectional area ratio ( r2= 0.53, P < 0.05), with no additional variables enhancing the prediction equation. There were no differences in muscle glycogen, creatine phosphate, ATP, or total creatine 48 h after, compared with before, downhill running; however, the change in muscle glycogen after downhill running was associated with a higher FM/FFM ( r = −0.56, P < 0.05). These data suggest that FM/FFM is a major determinant of losses in muscle strength after downhill running.

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