Comparison Between Two Volume-Matched Squat Exercises With and Without Momentary Failure for Changes in Hormones, Maximal Voluntary Isometric Contraction Strength, and Perceived Muscle Soreness

2019 ◽  
Vol Publish Ahead of Print ◽  
Author(s):  
Keisuke Shibata ◽  
Kazuki Takizawa ◽  
Nobuyasu Tomabechi ◽  
Kazunori Nosaka ◽  
Masao Mizuno
Keyword(s):  
Isometric Contraction ◽  
Muscle Soreness ◽  
Maximal Voluntary Isometric Contraction

scholarly journals The Efficacy of Tart Cherry Juice in Aiding Recovery After Intermittent Exercise

2020 ◽  
Vol 15 (3) ◽  
pp. 368-374 ◽  
Author(s):  
Rebecca Quinlan ◽  
Jessica A. Hill
Keyword(s):  
Creatine Kinase ◽  
Isometric Contraction ◽  
Muscle Soreness ◽  
Intermittent Exercise ◽  
Tart Cherry ◽  
C Reactive Protein ◽  
Countermovement Jump ◽  
Maximal Voluntary Isometric Contraction ◽  
Reactive Protein ◽  
Cherry Juice

Purpose: To investigate the effects of supplementation with tart cherry juice (TCJ) on markers of recovery after intermittent exercise under habitual dietary conditions. Methods: Using a randomized, single-blind, placebo (PLA)-controlled, independent-groups design, 20 team-sport players (8 male and 12 female; age 26 [4] y, height 175.4 [9.6] cm, body mass 70.2 [12.6] kg) were divided equally into 2 groups and consumed either TCJ or PLA twice per day for 8 consecutive days while following their normal dietary habits. Participants completed an adapted version of the Loughborough Intermittent Shuttle Test (LIST) on day 6 of supplementation. Countermovement jump, 20-m sprint, maximal voluntary isometric contraction, and delayed onset muscle soreness were assessed at baseline and 1, 24, and 48 hours post-LIST. Blood markers of muscle damage (creatine kinase) and inflammation (C-reactive protein) were taken presupplementation, immediately pre-LIST, and 1, 24, and 48 hours post-LIST. Data were analyzed using a repeated-measures analysis of variance. Results: Countermovement jump, 20-m sprint, and maximal voluntary isometric contraction showed significantly faster recovery with TCJ (P < .05) at 24 and 48 hours post-LIST. A significant interaction effect (P < .05) was observed for muscle soreness; however, Bonferroni post hoc analysis could not identify when the significant differences between TCJ and PLA occurred. There were no significant differences throughout recovery between TCJ and PLA for C-reactive protein and creatine kinase (P < .05). Conclusion: The results suggest that TCJ, in addition to habitual diet, can accelerate recovery after intermittent exercise and therefore extend the efficacy of TCJ in accelerating recovery in team sports.

scholarly journals Effects of Vibratory Stimulations on Maximal Voluntary Isometric Contraction from Delayed Onset Muscle Soreness

2013 ◽  
Vol 25 (9) ◽  
pp. 1093-1095 ◽  
Author(s):  
Hyung-Woo Koh ◽  
Sung-Hyoun Cho ◽  
Cheol-Yong Kim ◽  
Byung-Jun Cho ◽  
Jin-Woo Kim ◽  
...  
Keyword(s):  
Isometric Contraction ◽  
Muscle Soreness ◽  
Delayed Onset Muscle Soreness ◽  
Maximal Voluntary Isometric Contraction ◽  
Delayed Onset

scholarly journals Fascia Thickness Increases Following Eccentric Exercise Leading to Delayed Onset Muscle Soreness

2021 ◽  
Author(s):  
Sarah Tenberg ◽  
Kazunori Nosaka ◽  
Jan Wilke
Keyword(s):  
Eccentric Exercise ◽  
Isometric Contraction ◽  
Muscle Soreness ◽  
Biceps Brachii ◽  
Passive Movement ◽  
Delayed Onset Muscle Soreness ◽  
Deep Fascia ◽  
Maximal Voluntary Isometric Contraction ◽  
Post Exercise ◽  
Delayed Onset

Abstract Background: The deep fascia fuses tightly with the skeletal muscle and, thus, may be damaged by eccentric loading. Methods: To study its possible involvement in delayed onset muscle soreness, 11 healthy participants (♂= 7; 24±2 years) performed fatiguing dumbbell elbow flexor eccentric exercise (EE) for one arm and concentric exercise (CE) for the other arm in random order and with random arm allocation. Before, immediately after and 24-96 hours post-exercise, maximal voluntary isometric contraction torque of the elbow flexors (dynamometer), pressure pain (algometer), palpation pain (100-mm visual analog scale), biceps brachii fascia thickness and fascia/muscle mobility during passive movement (both high-resolution ultrasound) were examined. Results: Palpation pain, suggestive of DOMS, was greater after EE than CE, and maximal voluntary isometric contraction torque decreased greater after EE than CE (p<.05). Relative to CE, EE increased fascia thickness at 48 (+17%), 72 (+14%) and 96 (+15%) hours post-exercise (p<.05). At 96 hours post-EE, the increase in fascia thickness correlated with palpation pain (r=.68; p<.05). Fascia mobility was not different between conditions, but compared to CE, muscle displacement increased at 24 (+31%), 72 (+31%), and 96 (+41%) hours post-EE (p<.05). Conclusion: Collectively, these results suggest an involvement of the deep fascia in delayed onset muscle soreness.

Cardiovascular and nitric oxide response after maximal voluntary isometric contraction in adolescents with and without Down Syndrome v1

2021 ◽  
Author(s):  
Geiziane Leite Rodrigues Melo ◽  
Dahan Cunha Nascimento ◽  
Weldson Abreu ◽  
Rafael Olher ◽  
Lysleine Deus ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Down Syndrome ◽  
Isometric Contraction ◽  
Cardiovascular Response ◽  
Exercise Session ◽  
Isometric Handgrip ◽  
Maximal Voluntary Isometric Contraction ◽  
Post Exercise ◽  
Muscle Groups ◽  
Familiarization Session

Background This study was designed to compare the cardiovascular and nitric oxide (NO) responses to maximal voluntary isometric contraction (MVIC) with different muscle groups (leg press [LEP] and isometric handgrip [IHG] exercise) of adolescents with Down syndrome (DS) and age-matched non-DS peers. We also aimed to compare the absolute and relative IHG strength between groups. MethodsEleven adolescents with DS (14.1 ± 1.0 years) and ten without DS (13.7 ± 1.25 years)participants performed two experimental sessions of LEP and IHG exercises: 1) familiarization session and 2) 3 attempts x 5-sec contraction at MVIC with 3-min rest interval. Blood pressure (BP), heart rate (HR) and NO were collected at rest, immediately post-exercise session, and 10-min post-exercise. Results There were no differences for cardiovascular and NO responses between groups for MVIC test using different muscle groups. However, DS group displayed a lower but not significantly cardiovascular response at rest and after MVIC tests than controls. Furthermore, DS group displayed a higher NO- concentration at rest, recovery and after IHG when compared to controls (P< 0.05). In addition, DS adolescents displayed a significantly lower level in absolute and relative IHG strength when compared to controls (P = 0.001). Conclusions Individuals with DS display a lower cardiovascular response at rest and after MVIC tests than controls and higher NO response after exercise.

Effects of Collagen Peptides on Recovery Following Eccentric Exercise in Resistance-Trained Males—A Pilot Study

2020 ◽  
pp. 1-8
Author(s):  
Joel L. Prowting ◽  
Debra Bemben ◽  
Christopher D. Black ◽  
Eric A. Day ◽  
Jason A. Campbell
Keyword(s):  
Muscle Soreness ◽  
Exercise Bout ◽  
Jump Height ◽  
Countermovement Jump ◽  
Connective Tissues ◽  
Maximal Voluntary Isometric Contraction ◽  
Collagen Peptides ◽  
Drop Jumps ◽  
Performance Decline ◽  
Time Point

The authors sought to determine whether consuming collagen peptides (CP) enhances musculoskeletal recovery of connective tissues following a damaging exercise bout. Resistance-trained males consumed 15 g/day of CP (n = 7) or placebo (n = 8), and after 7 days, maximal voluntary isometric contraction (MVIC), countermovement jump height, soreness, and collagen turnover were examined. Five sets of 20 drop jumps were performed and outcome measures were collected 24, 48, and 120 hr postexercise. Countermovement jump height was maintained in the CP group at 24 hr (PRE = 39.9 ± 8.8 cm vs. 24 hr = 37.9 ± 8.9 cm, p = .102), whereas the CP group experienced a significant decline at 24 hr (PRE = 40.4 ± 7.9 cm vs. 24 hr = 35.5 ± 6.4 cm, p = .001; d = 0.32). In both groups, muscle soreness was significantly higher than PRE at 24 hr (p = .001) and 48 hr (p = .018) but not at 120 hr (p > .05). MVIC in both legs showed a significant time effect (left: p = .007; right: p = .010) over the 5-day postexercise period. Neither collagen biomarker changed significantly at any time point. CP supplementation attenuated performance decline 24 hr following muscle damage. Acute consumption of CP may provide a performance benefit the day following a bout of damaging exercise in resistance-trained males.

scholarly journals Reliability of Motor Unit Behavior during a Maximal Voluntary Isometric Contraction of the Knee Extensors

2019 ◽  
Vol 51 (Supplement) ◽  
pp. 340-341
Author(s):  
Ryan J. Colquhoun ◽  
Patrick M. Tomko ◽  
Mitchel A. Magrini ◽  
Sydnie R. Fleming ◽  
Matthew C. Ferrell ◽  
...  
Keyword(s):  
Motor Unit ◽  
Isometric Contraction ◽  
Knee Extensors ◽  
Maximal Voluntary Isometric Contraction

Simultaneous potentiation and fatigue in quadriceps after a 60-second maximal voluntary isometric contraction

1991 ◽  
Vol 70 (2) ◽  
pp. 726-731 ◽  
Author(s):  
R. W. Grange ◽  
M. E. Houston
Keyword(s):  
Isometric Contraction ◽  
Recovery Period ◽  
Lactate Concentration ◽  
Fold Increase ◽  
Quadriceps Muscle ◽  
Muscle Performance ◽  
Light Chains ◽  
Maximal Voluntary Isometric Contraction ◽  
Muscle Lactate ◽  
Isometric Twitch

Potential mechanisms of fatigue (metabolic factors) and potentiation (phosphate incorporation by myosin phosphorylatable light chains) were investigated during recovery from a 60-s maximal voluntary isometric contraction (MVC) in the quadriceps muscle of 12 subjects. On separate days before and for 2 h after the 60-s MVC, either a 1-s MVC or electrically stimulated contractions were used as indexes to test muscle performance. Torque at the end of the 60-s MVC was 57% of the initial level, whereas torques from a 1-s MVC and 50-Hz stimulation were most depressed in the immediate recovery period. At this time, muscle biopsy analyses revealed significant decreases in ATP and phosphocreatine and a 19-fold increase in muscle lactate. Conversely, isometric twitch torque and torque from a 10-Hz stimulus were the least depressed of six contractile indexes and demonstrated potentiation of 25 and 34%, respectively, by 4 min of recovery (P less than 0.05). At this time, muscle lactate concentration was still 16 times greater than at rest. An increased phosphate content of the myosin phosphorylatable light chains (P less than 0.05) was also evident both immediately and 4 min after the 60-s MVC. We conclude that the 60-s MVC produced marked force decreases likely due to metabolic displacement, while the limited decline in the twitch and 10-Hz torques and their significant potentiation suggested that myosin phosphorylation may provide a mechanism to enhance contractile force under conditions of submaximal activation during fatigue.

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