TY  - JOUR
A1  - Beijersbergen, Chantal M. I.
A1  - Granacher, Urs
A1  - Gaebler, Martijn
A1  - DeVita, Paul
A1  - Hortobagyi, Tibor
T1  - Hip mechanics underlie lower extremity power training-induced increase  in old adults’ fast gait velocity
BT  - the Potsdam Gait Study (POGS)
JF  - Gait & posture
N2  - Methods: As part of the Potsdam Gait Study (POGS), healthy old adults completed a no-intervention control period (69.1 +/- 4A yrs, n =14) or a power training program followed by detraining (72.9 +/- 5.4 yrs, n = 15).We measured isokinetic knee extensor and plantarflexor power and measured hip, knee and ankle kinetics at habitual, fast and standardized walking speeds. Results: Power training significantly increased isokinetic knee extensor power (25%), plantarflexor power (43%), and fast gait velocity (5.9%). Gait mechanics underlying the improved fast gait velocity included increases in hip angular impulse (29%) and H1 work (37%) and no changes in positive knee (K2) and A2 work. Detraining further improved fast gait velocity (4.7%) with reductions in H1(-35%), and increases in K2 (36%) and A2 (7%). Conclusion: Power training increased fast gait velocity in healthy old adults by increasing the reliance on hip muscle function and thus further strengthened the age-related distal-to-proximal shift in muscle function. (C) 2016 Elsevier B.V. All rights reserved.
KW  - Walking
KW  - Biomechanics
KW  - Detraining
KW  - Muscle
KW  - Exercise
Y1  - 2017
U6  - https://doi.org/10.1016/j.gaitpost.2016.12.024
SN  - 0966-6362
SN  - 1879-2219
VL  - 52
SP  - 338
EP  - 344
PB  - Elsevier
CY  - Clare
ER  - 
TY  - JOUR
A1  - Lacroix, Andre
A1  - Kressig, Reto W.
A1  - Mühlbauer, Thomas
A1  - Gschwind, Yves J.
A1  - Pfenninger, Barbara
A1  - Bruegger, Othmar
A1  - Granacher, Urs
T1  - Effects of a Supervised versus an Uniupervised Combined Balance and Strength Training Program on Balance and Muscle Power in Healthy Older Adults: A Randomized Controlled Trial
JF  - Gerontology
N2  - Background: Losses in lower extremity muscle strength/power, muscle mass and deficits in static and particularly dynamic balance due to aging are associated with impaired functional performance and an increased fall risk. It has been shown that the combination of balance and strength training (BST) mitigates these age-related deficits. However, it is unresolved whether supervised versus unsupervised BST is equally effective in improving muscle power and balance in older adults. Objective:This study examined the impact of a 12-week BST program followed by 12 weeks of detraining on measures of balance and muscle power in healthy older adults enrolled in supervised (SUP) or unsupervised (UNSUP) training. Methods: Sixty-six older adults (men: 25, women: 41; age 73 4 years) were randomly assigned to a SUP group (2/week supervised training, 1/week unsupervised training; n = 22), an UNSUP group (3/week unsupervised training; n = 22) or a passive control group (CON; n = 22). Static (i.e., Romberg Test) and dynamic (i.e., 10-meter walk test) steady-state, proactive (i.e., Timed Up and Go Test, Functional Reach Test), and reactive balance (e.g., Push and Release Test), as well as lower extremity muscle power (i.e., Chair Stand Test; Stair Ascent and Descent Test) were tested before and after the active training phase as well as after detraining. Results: Adherence rates to training were 92% for SUP and 97% for UNSUP. BST resulted in significant group x time interactions. Post hoc analyses showed, among others, significant training-related improvements for the Romberg Test, stride velocity, Timed Up and Go Test, and Chair Stand Test in favor of the SUP group. Following detraining, significantly enhanced performances (compared to baseline) were still present in 13 variables for the SUP group and in 10 variables for the UNSUP group. Conclusion: Twelve weeks of BST proved to be safe (no training-related injuries) and feasible (high attendance rates of >90%). Deficits of balance and lower extremity muscle power can be mitigated by BST in healthy older adults. Additionally, supervised as compared to unsupervised BST was more effective. Thus, it is recommended to counteract intrinsic fall risk factors by applying supervised BST programs for older adults. (C) 2015 The Author(s) Published by S. Karger AG, Basel
KW  - Sensorimotor training
KW  - Resistance training
KW  - Gym-based/home-based training
KW  - Detraining
KW  - Seniors
Y1  - 2016
U6  - https://doi.org/10.1159/000442087
SN  - 0304-324X
SN  - 1423-0003
VL  - 62
SP  - 275
EP  - 288
PB  - Karger
CY  - Basel
ER  -