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Berkiye Kirmizigil, Jeffry Roy Chauchat, Omer Yalciner, Gozde Iyigun, Ender Angin and Gul Baltaci

Unaccustomed physical activity with high intensity and eccentric contractions may cause muscle damage that may present itself as delayed onset muscle soreness (DOMS). 1 , 2 Indeed, DOMS is accepted as a type I muscle strain. 3 Stiffness, soreness, and tenderness of muscles are symptoms associated

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Zeynep Hazar Kanik, Seyit Citaker, Canan Yilmaz Demirtas, Neslihan Celik Bukan, Bulent Celik and Gurkan Gunaydin

Delayed onset muscle soreness (DOMS) is a well-known phenomenon that occurs after unaccustomed or strenuous exercise, particularly if the exercise involves a lot of eccentric contractions. 1 Many theories have been proposed to explain the mechanism of DOMS, such as lactic acid accumulation, muscle

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Timothy J.H. Lathlean, Paul B. Gastin, Stuart V. Newstead and Caroline F. Finch

by the recommendations of Hooper and Mackinnon, 5 can be identified through 5 main factors: sleep, fatigue, soreness, stress, and mood. This easy-to-implement, practical and inexpensive questionnaire has previously been utilized in elite AFL players. 6 Elite junior AF players can encounter various

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Will Abbott, Callum Brashill, Adam Brett and Tom Clifford

function and muscle soreness following a competitive soccer match in professional players. We hypothesized that TCJ supplementation would accelerate the recovery of muscle function and attenuate muscle soreness following a match. Methods Participants Twelve professional male soccer players from the reserve

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Michael G. Miller, David C. Berry, Susan Bullard and Roger Gilders

Context:

Land and aquatic plyometrics have clinical relevance for exercise, sport performance, and rehabilitation, yet study is limited comparing both.

Objective:

To compare the effects of land-based and aquatic-based plyometric-training programs on performance variables, muscle soreness, and range of motion (ROM).

Setting:

Aquatic facility and biomechanics laboratory.

Subjects:

Forty subjects randomly assigned to 3 groups: land (n = 13), water (n = 13), and control (n = 14).

Main Outcome Measures:

Performance variables, muscle soreness, and ROM were measured before and after an 8-week training period. An analysis of covariance (ANCOVA) and a Bonferroni post hoc test determined significance.

Results:

ANCOVA revealed significant differences between groups with respect to plantar-flexion ROM (P < .05). Paired t test determined that the aquatic group significantly increased muscle power pretest to posttest (P < .05).

Conclusions:

Results indicate that aquatic plyometric training can be an alternative approach to enhancing performance.

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Lorette J. Pen, Craig Fisher, Gary A. Sforzo and Beth G. McManis

The effects of cognitive strategies on pain tolerance and performance in subjects with muscle soreness were investigated. Female (n = 18) and male (n =12) subjects were matched for strength and then randomly assigned to dissociation, association, or control groups. Muscle soreness was induced in the quadriceps and hamstrings muscle groups by repeated eccentric contractions against heavy resistance, which resulted in significant decrements in peak torque (PT) and total work (TW). ANOVAs revealed no significant group differences (p < .05) in muscle soreness, state anxiety, and estimated strength and endurance performance 48 hr following the soreness induction. Association strategy subjects increased their quadriceps strength performance following cognitive intervention, whereas strength performance in the dissociation and control groups was not affected. No significant treatment effects were observed for hamstrings strength or quadriceps and hamstrings endurance. Both dissociation and association groups perceived that using the strategies enhanced their performance. This illusory efficacy effect may have implications for performance enhancement, particularly in injury rehabilitation.

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Thilo Hotfiel, Marion Kellermann, Bernd Swoboda, Dane Wildner, Tobias Golditz, Casper Grim, Martin Raithel, Michael Uder and Rafael Heiss

Muscle injuries are one of the most common sports injuries, presenting an incidence up to 10% to 55% of all injuries. 1 – 3 Delayed onset muscle soreness (DOMS), an entity of ultrastructural muscle injury is classified as an overexertion-functional muscle disorder type Ib according to the “Munich

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Jordan D. Philpott, Chris Donnelly, Ian H. Walshe, Elizabeth E. MacKinley, James Dick, Stuart D.R. Galloway, Kevin D. Tipton and Oliver C. Witard

leakage of myofiber proteins ( Clarkson & Hubal, 2002 ). These metabolic events are associated with delayed onset of muscle soreness (DOMS) and local muscular inflammation 24–48 hours after exercise ( Armstrong, 1984 ; Fridén & Lieber, 2001 ). With a view to minimizing muscle damage and/or accelerating

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Kazunori Nosaka, P.▀ Sacco and K.▀ Mawatari

This study investigated the effect of a supplement containing 9 essential and 3 non-essential amino acids on muscle soreness and damage by comparing two endurance exercise bouts of the elbow fexors with amino acid or placebo supplementation in a double blind crossover design. The supplement was ingested 30 min before (10 h post-fasting) and immediately after exercise (Experiment 1), or 30 min before (2-3 h after breakfast), immediately post, and 8 more occasions over 4-day post-exercise (Experiment 2). Changes in muscle soreness and indicators of muscle damage for 4 days following exercise were compared between supplement conditions using two-way ANOVA. No significant differences between conditions were evident for Experiment 1; however, plasma creatine kinase, aldolase, myoglobin, and muscle soreness were significantly lower for the amino acid versus placebo condition in Experiment 2. These results suggest that amino acid supplementation attenuates DOMS and muscle damage when ingested in recovery days.

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Joseph Hamill, Patty S. Freedson, Priscilla M. Clarkson and Barry Braun

This study involved an 8-day protocol to determine the effects of delayed-onset muscle soreness (DOMS) on the mechanics of the lower extremity and on oxygen consumption during level running. On Day 1 the subjects, 10 healthy female recreational runners, were administered a treadmill max V̇O2 test. They completed a 30-min downhill run on Day 3 to induce muscle soreness. On Days 2, 5, and 8 they completed a 15-min level run at a speed corresponding to 80% of V̇O2max. Subsequent to each run the subjects completed a muscle soreness questionnaire and a blood sample was taken for creatine kinase (CK) analysis. Data analysis revealed statistically significant between-day differences for perceived muscle soreness and CK activity. However, metabolic cost was not different between days. There were significant differences between days in maximum ankle support dorsiflexion and plantar flexion and maximum knee flexion during both support and swing. None of the global parameters describing the total stride produced significant differences between Days 2 and 5. Therefore DOMS appeared to have little effect on V̇O2 and a small effect on the kinematics of the lower extremity.