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Muscle strengthening exercise for gastrocnemius.

Muscle strengthening exercise for gastrocnemius.

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Figure 1. Muscle strengthening exercise for rectus femoris.
Figure 2. Muscle strengthening exercise for gastrocnemius.
Figure 3. Muscle stretching exercise for rectus femoris.
Figure 4. Muscle stretching exercise for gastrocnemius.
Figure 5. Electrode placement.
The effects of strengthening exercise, stretching and meditation on electromyography onset timing of the rectus femoris and gastrocnemius during vertical jump performance in healthy adults
Article
Full-text available
  • Jun 2015
Objective: Jump training helps increase the muscle power by improving the muscle strength and reaction time of the muscle in operation. The purpose of this study was to identify the effects of strengthening, stretching exercise and meditation on electromyographic (EMG) onset timing of rectus femoris and gastrocnemius muscle during vertical jump per...
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Context 1
... for the muscle strengthening exercise for gastro- cnemius, the subjects were asked to lift their heels three times per 10 seconds, which was repeated 5 times, as they were standing upright (Figure 2). ...

Citations

... They can be divided into single-joint or, more complex, multi-joint, or whole-body neural adaptations [22]. While firing frequency, synchronization of motor units, spinal reflexes, antagonist (co)activation, and some cortical adaptations can be assessed from single joint movements [23], between-muscle coordination can then be additionally assessed in a combination of multiple joints [24][25][26]. Muscular activation strategies to explosive movements, such as squat jump (SJ) and countermovement jump (CMJ), was found to be specific [26,27] and follows precise muscle control in a feedforward manner [28]. The central nervous system dispenses nerve impulse volleys (muscle activation patterns), which then stimulate muscles in a specific sequence, time, and amplitude. ...
... The principle optimizes the timing of segment motion in order to maximize the vertical velocity of the body's center of mass and allow for efficient energy to be transferred from proximal to distal segments [31,34]. It could be, therefore, speculated that muscle activation timing is individually conditioned-in order for one to optimally exploit their muscle properties-and have to be optimized [25,35] to enhance performance in vertical jumps [36]. ...
Muscle Activation Sequence in Flywheel Squats
Article
Full-text available
  • Mar 2021
  • Int J Environ Res Publ Health
Background: Muscle coordination is important for rational and effective planning of therapeutic and exercise interventions using equipment that mimics functional movements. Our study was the first to assess muscle coordination during flywheel (FW) squats. Methods: Time-of-peak electromyographic activation order was assessed separately for 8, 4, and 3 leg muscles under four FW loads. A sequential rank agreement permutations tests (SRA) were conducted to assess activation order and Kendall's tau was used to assess the concordance of activation order across subjects, loads and expected order of activation. Results: SRA revealed a latent muscle activation order at loads 0.05, 0.075, and 0.1, but not at 0.025 kg·m2. Kendall's tau showed moderate-to-strong concordance between the expected (proximal-to-distal) and the observed muscle activation order only at a load 0.025 kg·m2, regardless of the number of muscles analyzed. Muscle activation order was highly concordant between loads 0.05, 0.075, and 0.1 kg·m2. Conclusions: The results show a specific role of each muscle during the FW squat that is load-dependent. While the lowest load follows the proximal-to-distal principle of muscle activation, higher loads lead to a reorganization of the underlying muscle coordination mechanisms. They require a specific and stable muscle coordination pattern that is not proximal-to-distal.
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