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- Nyberg, Andre, et al.
(författare)
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Validity of using elastic bands to measure knee extension strength in older adults
- 2016
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Ingår i: Journal of Novel Physiotherapy and Physical Rehabilitation. - : Peertechz Publications Private Limited. - 2455-5487. ; 3:1, s. 16-21
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Tidskriftsartikel (refereegranskat)abstract
- Background and objectives: Maximal strength assessment of knee extensors in older adults using elastic resistance bands have rarely been addressed even though resistance training using elastic bands have shown large effects on muscle strength in this group of people. We therefore aim to determine the validity of maximal knee extension strength assessment using elastic resistance bands in older women and men.Methods: Twenty-four participants (12 women and 12 men; 61.8 ± 6.0 years; 173.5 ± 10.2 cm; 71.9 ± 15.7 kg) were included. To assess maximal knee extension strength, participants performed one-repetition maximum testing of concentric knee extension using elastic resistance bands as well as a maximal concentric knee extension isokinetic test at 60°/s using a stationary isokinetic dynamometer. Concurrent validity of the two measurement techniques were assed using intraclass correlation coefficient (ICC2.1), Pearson correlations (R), concordance correlations (Rc) and by determining variations on an individual level using 95% limits of agreement (LoA) with isokinetic dynamometry measurement as the reference standard.Results: Validity analysis showed good to excellent agreement and relationships but wide 95% LoA between elastic one-repetition maximum and isokinetic peak torque for all participants (ICC = 0.88; R = 0.90; Rc = 0.85, LoA = 10.5 kg), for women (ICC = 0.67; R = 0.77; Rc = .62, LoA = 7.7 kg) and for men (ICC = 0.80; R = 0.85; Rc = 0.78, LoA = 13.1 kg), respectively.Conclusion: One-repetition maximum testing using elastic resistance bands provides valid measurements of maximal knee extension strength in older women and men but with wide variations on an individual level.
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| 2. |
- Stenlund, Tobias, 1975-, et al.
(författare)
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Adaptation of postural reactions in seated positions and influence of head posture when exposed to a single sideway perturbation : relevance for driving on irregular terrain
- 2016
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Ingår i: Journal of Novel Physiotherapy and Physical Rehabilitation. - : Peertechz Publications Private Limited. - 2455-5487. ; 3:1, s. 022-029
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Tidskriftsartikel (refereegranskat)abstract
- Background and objectives: Mechanical perturbations in seated positions caused by driving on irregular terrain destabilize the driver which, combined with the drivers’ posture, may cause musculoskeletal disorders. The aim of this study was to investigate adaptation and the effect of different head postures on seated postural reactions caused by perturbations. Materials and Methods: Twenty healthy male participants, aged 18-43 years, were tested on a movable platform delivering 15 sideways perturbations (peak acceleration 13.3 m/s2) while the participants held their head in a neutral or a laterally flexed posture. Surface electromyography (EMG) signals were recorded bilaterally in upper neck, trapezius, erector spinae and external oblique, while kinematics were recorded with inertial sensors for the head, trunk and pelvis. EMG amplitudes, muscle onset latencies and angular displacements in the frontal plane were analyzed. Results: In the neutral position, the EMG amplitudes and neck angular displacements significantly decreased by 0.2% and more than 1.6° respectively after repeated perturbations. Muscle onset latencies remained unchanged. During lateral flexion of the head, the EMG amplitudes decreased by 0.5% but the muscular onset latencies increased by more than 9 ms. Conclusion: The developed neuromuscular strategy seem to prefer a reduced EMG amplitude. The modest size of the postural reactions during the conditions presented here do not by themselves explain the musculoskeletal disorders found in drivers.
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