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  - Gaebler, Martijn
A1  - Prieske, Olaf
A1  - Hortobagyi, Tibor
A1  - Granacher, Urs
T1  - The effects of concurrent strength and endurance training on physical fitness and athletic performance in Youth
BT  - a systematic review and Meta-Analysis
JF  - Frontiers in physiology
N2  - Combining training of muscle strength and cardiorespiratory fitness within a training cycle could increase athletic performance more than single-mode training. However, the physiological effects produced by each training modality could also interfere with each other, improving athletic performance less than single-mode training. Because anthropometric, physiological, and biomechanical differences between young and adult athletes can affect the responses to exercise training, young athletes might respond differently to concurrent training (CT) compared with adults. Thus, the aim of the present systematic review with meta-analysis was to determine the effects of concurrent strength and endurance training on selected physical fitness components and athletic performance in youth. A systematic literature search of PubMed and Web of Science identified 886 records. The studies included in the analyses examined children (girls age 6-11 years, boys age 6-13 years) or adolescents (girls age 12-18 years, boys age 14-18 years), compared CT with single-mode endurance (ET) or strength training (ST), and reported at least one strength/power-(e.g., jump height), endurance-(e.g., peak. VO2, exercise economy), or performance-related (e.g., time trial) outcome. We calculated weighted standardized mean differences (SMDs). CT compared to ET produced small effects in favor of CT on athletic performance (n = 11 studies, SMD = 0.41, p = 0.04) and trivial effects on cardiorespiratory endurance (n = 4 studies, SMD = 0.04, p = 0.86) and exercise economy (n = 5 studies, SMD = 0.16, p = 0.49) in young athletes. A sub-analysis of chronological age revealed a trend toward larger effects of CT vs. ET on athletic performance in adolescents (SMD = 0.52) compared with children (SMD = 0.17). CT compared with ST had small effects in favor of CT on muscle power (n = 4 studies, SMD = 0.23, p = 0.04). In conclusion, CT is more effective than single-mode ET or ST in improving selected measures of physical fitness and athletic performance in youth. Specifically, CT compared with ET improved athletic performance in children and particularly adolescents. Finally, CT was more effective than ST in improving muscle power in youth.
KW  - child
KW  - adolescent
KW  - muscle strength
KW  - cardiorespiratory fitness
KW  - physical conditioning human
KW  - resistance training
KW  - youth sports
Y1  - 2018
U6  - https://doi.org/10.3389/fphys.2018.01057
SN  - 1664-042X
VL  - 9
PB  - Frontiers Research Foundation
CY  - Lausanne
ER  -