7,125 research outputs found

    Exercise-induced abdominal muscle fatigue in healthy humans

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    Exercise-induced abdominal muscle fatigue in healthy humans. J Appl Physiol 100: 1554–1562, 2006. First published January 19, 2006; doi:10.1152/japplphysiol.01389.2005.—The abdominal muscles have been shown to fatigue in response to voluntary isocapnic hyperpnea using direct nerve stimulation techniques. We investigated whether the abdominal muscles fatigue in response to dynamic lower limb exercise using such techniques. Eleven male subjects [peak oxygen uptake (V˙ O2 peak) 50.0 1.9 (SE) ml kg 1 min 1] cycled at 90% V˙ O2 peak to exhaustion (14.2 4.2 min). Abdominal muscle function was assessed before and up to 30 min after exercise by measuring the changes in gastric pressure (Pga) after the nerve roots supplying the abdominal muscles were magnetically stimulated at 1–25 Hz. Immediately after exercise there was a decrease in Pga at all stimulation frequencies (mean 25 4%; P 0.001) that persisted up to 30 min postexercise ( 12 4%; P 0.001). These reductions were unlikely due to changes in membrane excitability because amplitude, duration, and area of the rectus abdominis M wave were unaffected. Declines in the Pga response to maximal voluntary expiratory efforts occurred after exercise (158 13 before vs. 145 10 cmH2O after exercise; P 0.005). Voluntary activation, assessed using twitch interpolation, did not change (67 6 before vs. 64 2% after exercise; P 0.20), and electromyographic activity of the rectus abdominis and external oblique increased during these volitional maneuvers. These data provide new evidence that the abdominal muscles fatigue after sustained, high-intensity exercise and that the fatigue is primarily due to peripheral mechanisms

    CONDITION OF GLUTATHIONE (GSH) METABOLISM SYSTEM AT ALLOTRANSPLANTATION OF EMBRYONIC MUSCULE TISSUE AT RATS

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    This article presents the results of determination of the of reduced glutathione content, glutathione reductase and glutathione peroxidase during allotransplantation of the embryo muscle tissue. During the research there was carried out 2 kinds of surgery: 1st - allotransplantation of embryo muscle tissue; 2nd - surgery without replanting. To obtain embryos we used female rats from gestation 3-4 weeks. We took an abdominal muscle tissue from embryo that was hemmed to homologous tissue of the adult rat. The same procedure was carried out with femoral muscle tissue.It was found that allotransplantation of the embryo muscle tissue leads to an increasing of restored glutathione at day 7 of experiment in femoral and abdominal muscle of adult rat, leads the increasing of glutathione glutathione reductase activity in all researched tissues on day 7 of the experiment, except the femoral muscle of the adult rat. At experiment day 7 during surgery without replanting glutathione increased in femoral and abdominal muscle tissue, and activity of glutathione reductase increased only in the abdominal muscle, while activity of glutathione peroxidase in the abdominal muscle tissue decreased

    Effects of a low back exercise program on low back pain patients’ lumbar lordotic angle, abdominal muscle power, and pain

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    Purpose: This study aims to identify the effects of a low back exercise program on low back pain patients’ lumbar lordotic angle, abdominal muscle power, and pain. Methods: This study was conducted with 20 low back pain patients. The lumbar lordotic angle, abdominal muscle, and pain of participants were measured before and after the interventions. The participants were asked to conduct McKenzie Exercise and William Exercise through a low back pain exercise program for 30 minutes three times a week for six weeks. Results: the lumbar lordotic angle increased after the interventions, but there was no significant difference, and there were significant differences in abdominal muscle power and pain (p < .05). Conclusion: As a result of this study, the low back exercise program acted positively on the increase in abdominal muscle power and pain reduction. Therefore, it is judged that a low back exercise program would help manage low back pain efficiently

    Pengaruh Latihan Twistink Trunk Curl Terhadap Kekuatan Dan Daya Tahan Otot Perut Pada Atlet Putri Shorinji Kempo Rumbai Pekanbaru

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    The issues raised in this studyis"Whether effect of exercise twistink trunk curl To Power and endurance abdominal muscle In the women atlets Shorinji Kempo Rumbai Pekanbaru?".This research is experimental research that aims to find out the effect of exercise twistink trunk curl To Power and endurance abdominal muscle In the women's atlet Shorinji Kempo Rumbai Pekanbaru. Population used was the entire women's atlet Shorinji Kempo Rumbai Pekanbaru as many as 8 people. This study uses total sampling technique the entire population sampled. Based on the determination of sample, the sampel of 8 people. As the independent variable (x) was training twistink trunk curl while the dependent variable (y) is the Power and endurance abdominal muscle. Were obtained and collected through the free test and post test before and after exercise twistink trunk curl using a meansuring tool that is sit up 30 second Test. The methodof processing data using descriptive statistics calculation sand to test the hypothes is using the t test.The hypothesis proposed in this studyis the effect ofexercise twistink trunk curl To Power and endurance abdominal muscle In the women atlets Shorinji Kempo Rumbai Pekanbaru.The result softhe ttest produced 20,44 and 1,895ttableat thesignificant leve lof 0.05. Meansttest>t table .So, the conclusion isthere is asignificant effect of exercise twistink trunk curl To Power and endurance abdominal muscle In the women's atlet Shorinji Kempo Rumbai Pekanbaru and Ha be accepted

    The influence of defined ante-mortem stressors on the early post-mortem biochemical processes in the abdominal muscle of the Norway lobster, Nephrops norvegicus (Linnaeus, 1758)

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    The effects of four different ante-mortem stressors (exercise, emersion, starvation and a patent infection with the parasite Hematodinium sp.) on post-mortem processes have been investigated in the abdominal muscle of Norway lobster Nephrops norvegicus by measuring changes in the pH, the levels of glycogen, l-lactate, arginine phosphate, ATP, ADP, AMP, IMP, HxR, Hx and the adenylate energy charge (AEC) over a time course of 24 h with samples being taken at 0, 3, 6, 12 and 24 h. The acute stresses of intense exercise and 2 h emersion resulted in a premature onset of anaerobic glycolysis, leading both to an enhanced glycogen depletion rate and an early accumulation of l-lactate. The chronic stressors, starvation and parasite infection, resulted in a complete ante-mortem depletion of muscle glycogen and consequently the failure of post-mortem glycolytic fermentation. Post-mortem pH and ATP inter-conversion were significantly altered in chronically stressed animals. Ante-mortem, a rapid, almost complete depletion of arginine phosphate was observed in all stress groups. The AEC was altered significantly by all stresses, indicating a strong energy demand. The findings suggest that ante-mortem stressors strongly influence the post-mortem biochemical processes. The laboratory-based results are compared to 'field' data and effects on post-harvest product quality are discussed

    Sonographic Appearance of Abdominal Wall at the Left Flank of Laparotomy Incision Site in Ettawah Grade Does

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    The aim of this study was to describe the sonographic appearance of abdominal wall at the left flank of laparotomy incision site in 11 mated Ettawah grade does. Brightness-mode ultrasound examination by using transducer with frequency of 5.0-6.0 MHz was conducted to grouping the does based on their pregnancy statuses. The incision site of the abdominal wall at left flank laparotomy was transcutaneous-scanned as long as 8 cm vertically. The sonographic appearance of the laparotomy wall thickness showed that in all groups of does were similar and not different statistically. The thickness of oblique external and oblique internal abdominal muscles increased in the pregnant does as compared to non-pregnant does (P&lt;0.05)

    Associations of Abdominal Muscle Area and Radiodensity with Adiponectin and Leptin: The Multiethnic Study of Atherosclerosis.

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    ObjectiveThis study examined the associations of muscle area and radiodensity with adiponectin and leptin.MethodsA total of 1,944 participants who enrolled in the Multi-Ethnic Study of Atherosclerosis underwent computed tomography to quantify body composition and measurements of adiponectin, leptin, interleukin-6, C-reactive protein, and resistin.ResultsThe mean age and BMI of participants were 64.7 years and 28.1 kg/m2 and 49% were female. With adjustment for age, gender, race/ethnicity, traditional cardiovascular disease risk factors, inflammatory biomarkers, physical activity, and sedentary behavior, a 1-SD increment in total abdominal, stability, and locomotor muscle area was associated with a 19%, 17%, and 12% lower adiponectin level, respectively (P &lt; 0.01 for all) but not leptin (P &gt; 0.05). Muscle radiodensity was more robustly associated with adiponectin and leptin in the multivariable linear regression models. That is, with full adjustment for all covariates, a 1-SD increment in total abdominal, stability, and locomotor muscle radiodensity was associated with a 31%, 31%, and 18% lower adiponectin level (P &lt; 0.01 for all) and a 6.7%, 4.6%, and 8.1% higher leptin level (P &lt; 0.05 for all), respectively.ConclusionsThe data suggest that increases in muscle area and radiodensity may have positive impacts on chronic inflammation and, in turn, reduce the risk of cardiometabolic disease

    Increased collagen synthesis rate during wound healing in muscle

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    Wound healing in muscle involves the deposition of collagen, but it is not known whether this is achieved by changes in the synthesis or the degradation of collagen. We have used a reliable flooding dose method to measure collagen synthesis rate in vivo in rat abdominal muscle following a surgical incision. Collagen synthesis rate was increased by 480% and 860% on days 2 and 7 respectively after surgery in the wounded muscle compared with an undamaged area of the same muscle. Collagen content was increased by approximately 100% at both day 2 and day 7. These results demonstrate that collagen deposition during wound healing in muscle is achieved entirely by an increase in the rate of collagen synthesis

    Pressure biofeedback unit to assess and train lumbopelvic stability in supine individuals with chronic low back pain

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    To determine if pressure biofeedback unit readings are related to abdominal muscle activation and centre of pressure displacement as well as to test the effects of using it as a biofeedback tool to control lumbopelvic motion. Eighteen volunteers with chronic nonspecific low back pain (21.28 ± 1.41 years old) who performed an active straight leg raising (dynamic postural challenge) with and without pressure biofeedback. Changes in the pressure biofeedback unit and on centre of pressure displacement were assessed, as well as bilateral electromyographic abdominal muscle activity. Participants were not allowed to use a Valsalva manoeuvre. Pressure variation was not significantly correlated with abdominal muscle activity or with mediolateral centre of pressure displacement. When used as a biofeedback instrument, there was a significant increase in almost all abdominal muscles activity as well as a significant decrease in pressure variation and in mediolateral centre of pressure displacement while performing an active straight leg raising with a normal breathing pattern. Despite not being an indicator of abdominal muscle activity or mediolateral load transfer in the supine position, the pressure biofeedback unit could have great relevance when used in the clinic for biofeedback purposes in individuals with low back pain.info:eu-repo/semantics/publishedVersio
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