Knee extensor strength, activation, and size in very elderly people following strength training

Harridge, Sdr; Kryger, Ann Isabel; Stensgaard, Anders

doi:10.1002/(sici)1097-4598(199907)22:7<831::aid-mus4>3.0.co;2-3

Cited by 272 publications

(234 citation statements)

References 28 publications

Supporting

Mentioning

197

Contrasting

Unclassified

Order By: Relevance

“…Incomplete activation of the ankle plantarflexors is commonly observed and voluntary activation levels of 90 to 99% have typically been reported [31,35,68] . In comparison with other muscles, relatively low levels of quadriceps femoris activation (85-95%) have frequently been observed [21,23,40,41,69,70,71,72,73,74,75] .…”

Section: Maximal Isometric Contractionsmentioning

confidence: 99%

See 1 more Smart Citation

Assessing Voluntary Muscle Activation with the Twitch Interpolation Technique

2004

View full text Add to dashboard Cite

Section: Maximal Isometric Contractionsmentioning

confidence: 99%

“…Most twitch interpolation studies employing healthy adult subjects suggest that voluntary activation does not increase after resistance training [7,8,66,71,95,96,97,98] , although there are exceptions [31,68,99] . Three factors should be borne in mind when interpreting the available evidence.…”

Section: 3 the Influence Of Resistance Trainingmentioning

confidence: 99%

Assessing Voluntary Muscle Activation with the Twitch Interpolation Technique

2004

View full text Add to dashboard Cite

“…It is well known that aging affects human skeletal muscle structure, which, in turn, may influence muscle contraction properties in elderly people [32,46,47]. This sarcopenia, associated to neural factors, notably to the reduction in motor unit activation capacity [17,49] and to the coactivation of antagonist muscles [23,43], may account for the loss of muscle strength and power in elderly people. However, these structural and neural factors alone cannot fully explain the decline of movement speed which accompanies normal aging.…”

Section: Overt Movement Executionmentioning

confidence: 99%

“…It is well known that normal aging influences cognitive functions [2,13,24,40,41] and sensorimotor control of actions [22,43,44]. The state of musculoskeletal system, in particular that of muscular mechanics and structure, is also modified [17,23,26,32,46,47,49]. At the neural level, clear differences emerge when comparing brain's activation between elderly and young people during the performance of motor or cognitive tasks.…”

Section: Introductionmentioning

confidence: 99%

Mentally represented motor actions in normal agingI. Age effects on the temporal features of overt and covert execution of actions

Skoura

Papaxanthis

Vinter

et al. 2005

Behavioural Brain Research

103

View full text Add to dashboard Cite

The present study examines the temporal features of overt and covert actions as a function of normal aging. In the first experiment, we tested three motor tasks (walking, sit-stand-sit, arm pointing) that did not imply any particular spatiotemporal constraints, and we compared the duration of their overt and covert execution in three different groups of age (mean ages: 22.5, 66.2 and 73.4 years). We found that the ability of generating motor images did not differentiate elderly subjects from young subjects. Precisely, regarding overt and covert durations, subjects presented similarities for the walking and pointing tasks and dissimilarities for the stand-sit-stand task. Furthermore, the timing variability of imagined movements was always greater compared to actual movements and was of the same amount in the three groups of age. In the second experiment, we investigated the effect of age (three groups with mean ages: 22, 64.8 and 73.2 years) upon temporal characteristics of covert and overt movements involving strong spatiotemporal constraints (speed/accuracy trade-off paradigm). During overt execution young and elderly subjects respected Fitts's law despite the fact that movement speed progressively decreased with age. Thus, while execution is deteriorated, the motor preparation process is still intact in old age, and follows well-known laws of biological motions. For covert execution, movement speed progressively decreased with age but elderly subjects did not respect Fitts's law. This suggests that the generation and control of motor intentions that consciously do not come to execution, particularly those concerning complex motor actions are progressively perturbed in the aging brain.

show abstract

“…1RM, rising from 41% to 134% over the course of 10 to 14 weeks. In contrast, isometric muscle strength increase is relatively low: 14% to 37% 19,20,32,33) . Therefore, regarding the results of the present study, we can safely assert that a relatively small variation in isometric strength depends on the testing/training's specificity.…”

Section: Discussionmentioning

confidence: 91%

The Effects of Manual Resistance Training on Improving Muscle Strength of the Lower Extremities of the Community Dwelling Elderly -A Clinical Intervention Study with A Control Group-

et al. 2011

View full text Add to dashboard Cite

Abstract. [Purpose] This study focused on the effects of Manual Resistance Training (MRT) performed by elderly people for their lower extremities. [Subjects and Methods] The subjects were 53 elderly persons. The isometric strength of the right knee-extensor of the subjects in the intervention group was assessed after MRT once a week for 12 weeks followed by MRT, twice a week for 12 more weeks. Subjects in the control group only received the muscle strength measurement and did not perform MRT.[Results] From the baseline, the muscle strength of the intervention group significantly increased by 13.2% after 12 weeks, and 29% after 24 weeks. A significant difference was observed between the muscle strength of the intervention group and that of the control group. Those with greater muscle strength experienced relatively low muscle strength augmentation, compared with those with less muscle strength.[Conclusion]MRT resulted in improvements in muscle strength, similar to the results reported for a prior intervention with a resistance training method. The intensity of the MRT was inferred to be more than 70% of 1-repetition maximum. MRT may have less impact if it is performed by people with relatively high muscle strength.

show abstract

Knee extensor strength, activation, and size in very elderly people following strength training

Cited by 272 publications

References 28 publications

Assessing Voluntary Muscle Activation with the Twitch Interpolation Technique

Assessing Voluntary Muscle Activation with the Twitch Interpolation Technique

Mentally represented motor actions in normal agingI. Age effects on the temporal features of overt and covert execution of actions

The Effects of Manual Resistance Training on Improving Muscle Strength of the Lower Extremities of the Community Dwelling Elderly -A Clinical Intervention Study with A Control Group-

Contact Info

Product

Resources

About