scholarly journals The effect of Liquid ice after high-intensity exercise on muscle function compared to Block ice

2022 ◽  
Vol 20 (1) ◽  
pp. 23-26
Author(s):  
Natsuki Matsumura ◽  
Shohei Nagashima ◽  
Kaho Negoro ◽  
Yoshiki Motomura ◽  
Kanako Shimoura ◽  
...  
Keyword(s):  
High Intensity ◽  
Muscle Function ◽  
High Intensity Exercise

Pseudoephedrine is without ergogenic effects during prolonged exercise

1996 ◽  
Vol 81 (6) ◽  
pp. 2611-2617 ◽  
Author(s):  
Hunter Gillies ◽  
Wayne E. Derman ◽  
Timothy D. Noakes ◽  
Peter Smith ◽  
Alicia Evans ◽  
...  
Keyword(s):  
Urinary Excretion ◽  
High Intensity ◽  
Muscle Function ◽  
Prolonged Exercise ◽  
Peak Plasma ◽  
Plasma Concentrations ◽  
High Intensity Exercise ◽  
Double Blind ◽  
Drug Concentrations ◽  
Ergogenic Effects

Gillies, Hunter, Wayne E. Derman, Timothy D. Noakes, Peter Smith, Alicia Evans, and Gary Gabriels.Pseudoephedrine is without ergogenic effects during prolonged exercise. J. Appl. Physiol. 81(6): 2611–2617, 1996.—This study was designed to measure whether a single dose of 120 mg pseudoephedrine ingested 120 min before exercise influences performance during 1 h of high-intensity exercise. The effects of exercise on urinary excretion of the drug were also studied. Ten healthy male cyclists were tested on two occasions, separated by at least 7 days, by using a randomly assigned, double-blind, placebo-controlled, crossover design. Exercise performance was tested during a 40-km trial on a laboratory cycle ergometer, and skeletal muscle function was measured during isometric contractions. On a third occasion, subjects ingested 120 mg pseudoephedrine but did not exercise [control (C)]. Pseudoephedrine did not influence either time trial performance [drug (D) vs. placebo: 58.1 ± 1.4 (SE) vs. 58.7 ± 1.5 min] or isometric muscle function. Urinary pseudoephedrine concentrations were significantly increased 1 h after exercise (D vs. C: 114.3 ± 27.2 vs. 35.4 ± 13.1 μg/ml; P < 0.05). Peak plasma pseudoephedrine concentrations ( P < 0.05) but not time taken to reach peak plasma concentrations or the area under the plasma pseudoephedrine concentration vs. time curve was significantly increased in the total group with exercise (D vs. C). In three subjects, plasma pseudoephedrine concentrations were not influenced by exercise. Only these subjects showed increased urinary pseudoephedrine excretion during exercise. We conclude that a single therapeutic dose of pseudoephedrine did not have a measurable ergogenic effect during high-intensity exercise of 1-h duration, but plasma drug concentrations and urinary excretion were altered by exercise. These findings have practical relevance to doping control regulations in international sporting competitions.

Blood Flow Restriction Training Applied With High-Intensity Exercise Does Not Improve Quadriceps Muscle Function After Anterior Cruciate Ligament Reconstruction: A Randomized Controlled Trial

2020 ◽  
Vol 48 (4) ◽  
pp. 825-837 ◽  
Author(s):  
Michael T. Curran ◽  
Asheesh Bedi ◽  
Christopher L. Mendias ◽  
Edward M. Wojtys ◽  
Megan V. Kujawa ◽  
...  
Keyword(s):  
Muscle Strength ◽  
High Intensity ◽  
Muscle Function ◽  
Controlled Trial ◽  
Cruciate Ligament ◽  
Quadriceps Muscle ◽  
High Intensity Exercise ◽  
Quadriceps Muscle Strength ◽  
Flow Restriction ◽  
Anterior Cruciate

Background: A major goal of rehabilitation after anterior cruciate ligament reconstruction (ACLR) is restoring quadriceps muscle strength. Unfortunately, current rehabilitation paradigms fall short of this goal, such that substantial quadriceps muscle strength deficits can limit return to play and increase the risk of recurrent injuries. Blood flow restriction training (BFRT) involves the obstruction of venous return to working muscles during exercise and may lead to better recovery of quadriceps muscle strength after ACLR. Purpose: To examine the efficacy of BFRT with high-intensity exercise on the recovery of quadriceps muscle function in patients undergoing ACLR. Study Design: Randomized controlled trial; Level of evidence, 2. Methods: A total of 34 patients (19 female, 15 male; mean age, 16.5 ± 2.7 years; mean height, 169.0 ± 19.7 cm; mean weight, 73.2 ± 17.7 kg) scheduled to undergo ACLR were randomly assigned to 1 of 4 groups: concentric (n = 8), eccentric (n = 8), concentric with BFRT (n = 9), and eccentric with BFRT (n = 9). The exercise component of the intervention consisted of patients performing a single-leg isokinetic leg press, at an intensity of 70% of the patients’ 1-repetition maximum during either the concentric or eccentric action, for 4 sets of 10 repetitions 2 times per week for 8 weeks beginning at 10 weeks postoperatively. Patients randomized to the BFRT groups performed the leg-press exercise with a cuff applied to the thigh, set to a limb occlusion pressure of 80%. Isometric and isokinetic (60 deg/s) quadriceps peak torque, quadriceps muscle activation, and rectus femoris muscle volume were assessed before ACLR, after BFRT, and at the time that patients returned to activity and were converted to the change in values from baseline for analysis. Also, 1-way analyses of covariance were used to compare the change in values for each dependent variable between groups after BFRT and at return to activity ( P ≤ .05). Results: No significant differences were found between groups for any outcome measures at either time point ( P > .05). Conclusion: An 8-week BFRT plus high-intensity exercise intervention did not significantly improve quadriceps muscle strength, activation, or volume. On the basis of our findings, the use of BFRT in conjunction with high-intensity resistance exercise in patients undergoing ACLR to improve quadriceps muscle function may not be warranted. Registration: NCT03141801 ( ClinicalTrials.gov identifier)

Noninvasive ventilation can modulate heart rate variability during high-intensity exercise in COPD-CHF patients

Heart & Lung ◽  
2021 ◽  
Vol 50 (5) ◽  
pp. 609-614
Author(s):  
Giovana Salgado Baffa ◽  
Cássia da Luz Goulart ◽  
Flávia Rossi Caruso ◽  
Adriana S. Garcia de Araújo ◽  
Polliana Batista dos Santos ◽  
...  
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Noninvasive Ventilation ◽  
High Intensity ◽  
High Intensity Exercise

scholarly journals Sudden Cardiac Death Risk in Downhill Skiers and Mountain Hikers and Specific Prevention Strategies

2021 ◽  
Vol 18 (4) ◽  
pp. 1621
Author(s):  
Josef Niebauer ◽  
Martin Burtscher
Keyword(s):  
Risk Factors ◽  
Risk Factor ◽  
Sudden Cardiac Death ◽  
High Intensity ◽  
Cardiac Death ◽  
High Intensity Exercise ◽  
Systemic Hypertension ◽  
Physical Strain ◽  
Mountainous Regions ◽  
Downhill Skiing

Sudden cardiac death (SCD) still represents an unanticipated and catastrophic event eliciting from cardiac causes. SCD is the leading cause of non-traumatic deaths during downhill skiing and mountain hiking, related to the fact that these sports are very popular among elderly people. Annually, more than 40 million downhill skiers and mountain hikers/climbers visit mountainous regions of the Alps, including an increasing number of individuals with pre-existing chronic diseases. Data sets from two previously published case-control studies have been used to draw comparisons between the SCD risk of skiers and hikers. Data of interest included demographic variables, cardiovascular risk factors, medical history, physical activity, and additional symptoms and circumstances of sudden death for cases. To establish a potential connection between the SCD risk and sport-specific physical strain, data on cardiorespiratory responses to downhill skiing and mountain hiking, assessed in middle-aged men and women, have been included. It was demonstrated that previous myocardial infarction (MI) (odds ratio; 95% CI: 92.8; 22.8–379.1; p < 0.001) and systemic hypertension (9.0; 4.0–20.6; p < 0.001) were predominant risk factors for SCD in skiers, but previous MI (10.9; 3.8–30.9; p < 0.001) and metabolic disorders like hypercholesterolemia (3.4; 2.2–5.2; p < 0.001) and diabetes (7.4; 1.6–34.3; p < 0.001) in hikers. More weekly high-intensity exercise was protective in skiers (0.17; 0.04–0.74; p = 0.02), while larger amounts of mountain sports activities per year were protective in hikers (0.23; 0.1–0.4; <0.001). In conclusion, previous MI history represents the most important risk factor for SCD in recreational skiers and hikers as well, and adaptation to high-intensity exercise is especially important to prevent SCD in skiers. Moreover, the presented differences in risk factor patterns for SCDs and discussed requirements for physical fitness in skiers and hikers will help physicians to provide specifically targeted advice.

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