control exercise
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2021 ◽  
Vol 12 ◽  
Author(s):  
Annalisa Di Giacomo ◽  
Giovanna Maria Ghiani ◽  
Francesco Todde ◽  
Filippo Tocco

Background: The aim of study was to assess hemodynamic changes during the simultaneous activation of muscle metaboreflex (MM) and diving reflex (DR) in a laboratory setting. We hypothesized that as long as the exercise intensity is mild DR can overwhelm the MM.Methods: Ten trained divers underwent all four phases (randomly assigned) of the following protocol. (A) Postexercise muscle ischemia session (PEMI): 3 min of resting followed by 3 min of handgrip at 30% of maximum force, followed immediately by 3 min of PEMI on the same arm induced by inflating a sphygmomanometer. Three minutes of recovery was further allowed after the cuff was deflated for a total of 6 min of recovery. (B) Control exercise recovery session: the same rest-exercise protocol used for A followed by 6 min of recovery without inflation. (C) DR session: the same rest-exercise protocol used for A followed by 1 min of breath-hold (BH) with face immersion in cold water. (D) PEMI-DR session: the same protocol used for A with 60 s of BH with face immersion in cold water during the first minute of PEMI. Stroke volume (SV), heart rate (HR), and cardiac output (CO) were collected by means of an impedance method.Results: At the end of apnea, HR was decreased in condition C and D with respect to A (−40.8 and −40.3%, respectively vs. −9.1%; p < 0.05). Since SV increase was less pronounced at the same time point (C = +32.4 and D = +21.7% vs. A = +6.0; p < 0.05), CO significantly decreased during C and D with respect to A (−23 and −29.0 vs. −1.4%, respectively; p < 0.05).Conclusion: Results addressed the hypothesis that DR overcame the MM in our setting.


2021 ◽  
Vol Volume 14 ◽  
pp. 2543-2562
Author(s):  
Sabina M Pinto ◽  
Sweta B Boghra ◽  
Luciana G Macedo ◽  
Yong-Ping Zheng ◽  
Marco YC Pang ◽  
...  

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Sranya Songjaroen ◽  
Panakorn Sungnak ◽  
Pagamas Piriyaprasarth ◽  
Hsing-Kuo Wang ◽  
James J. Laskin ◽  
...  

AbstractMotor control exercise (MCE) is commonly prescribed for patients with low back pain. Although MCE can improve clinical outcomes, lumbar multifidus muscle (LM) activation remains unchanged. Neuromuscular electrical stimulation (NMES) can be used to re-activate motor units prior to MCE which should result in increased LM activation. Therefore, this study aimed to explore the immediate effects of NMES combined with MCE on LM activation and motor performance. Twenty-five participants without low back pain (NoLBP) and 35 participants with movement control impairment (MCI) were recruited. Participants with MCI were further randomized to combined NMES with MCE (COMB) or sham-NMES with MCE (MCE) group. Ultrasound imaging was used to measure LM thickness at rest, maximum voluntary isometric contraction (MVIC), and NMES with MVIC. These data were used to calculate LM activation. Quadruped rocking backward was used to represent motor performance. LM activation and motor performance were measured at baseline and after one-session of intervention. Results showed that both COMB and MCE groups had significantly lower (P < 0.05) LM activation compared with NoLBP group at baseline. Additionally, both COMB and MCE groups demonstrated significant improvement (P < 0.05) in motor performance while COMB group demonstrated significantly greater improvement (P < 0.05) in LM activation compared with MCE group. Individuals with MCI still have persisting LM activation deficit. Our key findings suggest that combined NMES and MCE may have better ability to improve LM activation in individuals with MCI. These findings would support the utility of NMES to induce a priming effect before MCE.


2021 ◽  
Author(s):  
Deepak Jain ◽  
Deepali Patil ◽  
Pratik Phansopkar

Abstract Background: - Neck pain is defined as mechanical, neuropathic or secondary to any other disorder and it can be acute, 6 weeks; sub acute, 3 months; chronic, >3 months. types of potential causes for neck pain: medical effects, severe or non-threatening causes, usual and rare conditions, and genuine and invalid causes. Motor control was defined as motor relearning program with emphasis on coordination and holding capabilities of specific neck flexor, extensor, and shoulder girdle muscles. MET is a method of treatment that involves the voluntary contraction of a Patients muscle in a precisely controlled direction, against a counterforce provided by the therapist.Methodology: - In the study 50 chronic neck pain patients will be enrolled. And will be divided into 25 in each group. One group will receive Muscle Energy Technique and the other group will receive Motor Control Exercise as well as conventional therapy for 4 weeks. Pain, ROM and strength will be evaluated using the standard technique. Discussion: - The goal of this Interventional study is to examine the impact of MET versus MCE with conventional therapy on patients with chronic neck pain. This research will help in identifying rapid and long term effects of MET versus MCE with conventional therapy on patients with chronic neck pain. The clinical trial registry-India(CTRI) registration number for this trial is CTRI/2021/05/033497.


Synthese ◽  
2021 ◽  
Author(s):  
Juan Pablo Bermúdez

AbstractResearchers often claim that self-control is a skill. It is also often stated that self-control exertions are intentional actions. However, no account has yet been proposed of the skillful agency that makes self-control exertion possible, so our understanding of self-control remains incomplete. Here I propose theskill model of self-control, which accounts for skillful agency by tackling the guidance problem: how can agents transform their abstract and coarse-grained intentions into the highly context-sensitive, fine-grained control processes required to select, revise and correct strategies during self-control exertion? The skill model borrows conceptual tools from ‘hierarchical models’ recently developed in the context of motor skills, and asserts that self-control crucially involves the ability to manage the implementation and monitoring of regulatory strategies as the self-control exercise unfolds. Skilled agents are able do this by means offlexible practical reasoning: a fast, context-sensitive type of deliberation that incorporates non-propositional representations (including feedback signals about strategy implementation, such as the feeling of mental effort) into the formation and revision of the mixed-format intentions that structure self-control exertion. The literatures on implementation intentions and motivation framing offer corroborating evidence for the theory. As a surprising result, the skill of self-control that allows agents to overcome the contrary motivations they experience is self-effacing: instead of continuously honing this skill, expert agents replace it with a different one, which minimizes or prevents contrary motivations from arising in the first place. Thus, the more expert you are at self-control, the less likely you are to use it.


2021 ◽  
pp. 1-8
Author(s):  
Sara Hasanli ◽  
Sarah Hojjati ◽  
Maryam Koushkie Jahromi

<b><i>Background/Aims:</i></b> Research evidence regarding immune system responses and adaptations to psychological or physical stresses is controversial. This study aimed to investigate the effect of 8-week psychological stress and exercise activity (chronic adaptation) and the acute response of possibly adapted rats to psychological stress and exercise considering IFN-γ, IL-4, and IL-4/IFN-γ. <b><i>Methods:</i></b> Thirty-two rats were divided into 4 groups of 8 animals including control, exercise, psychological stress, and combination of exercise with psychological stress. IL-4 and IFN-γ cytokines were measured pre-experiment (preEX), immediately postexercise (IpostEX), and 72-h postexperiment protocol (72hpostEX). <b><i>Results:</i></b> There were no significant differences between the study groups regarding IFN-γ, IL-4, and IL-4/IFN-γ in preEX (<i>p</i> &#x3e; 0.05), IpostEX (<i>p</i> &#x3e; 0.05), and 72hpostEX (<i>p</i> &#x3e; 0.05). However, IL-4 increased significantly in IpostEX compared with preEX in exercise (<i>p</i> = 0.012) and combination of exercise with psychological stress (<i>p</i> = 0.03) groups. <b><i>Conclusions:</i></b> Exercise and combination of exercise and psychological stress induce similar acute response to IL-4 in chronic trained and stressed rats. Also, exercise may induce an acute synergistic effect with psychological stress on IL-4.


2021 ◽  
Author(s):  
◽  
V. J. Martínez Hernández

Exercise induces parasympathetic withdrawal and sympathetic activation. Heart rate variability (HRV) is a noninvasive tool for the assessment of cardiac autonomic function. Physical training can improve cardiovascular health through an increase in HRV. In this study, two physical trainings were conducted, one with moderate intensity (MT) and the second one with higher intensity (IT), for 10 weeks. A test protocol which consisted of 3 maneuvers: control, exercise, and recovery was performed each week of training to follow up the HRV changes in 18 sedentary volunteers aged 20.3±2 years. The RR intervals were analyzed by indexes of traditional Poincaré plot (SPP) and segmented Poincaré plot (SEPP). The results showed an increase in column 7 probabilities in week 10 with respect to week 4 during control stage for both trainings. Regarding, trainings differences, row 9 probability decreases in MT training suggesting a higher cardiac vagal activity in this training.


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