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Inami T, Yamaguchi S, Nishioka T, Ishida H, Morito A, Yamada S, Nagata N, Murayama M. Relationships between Changes in Muscle Shear Modulus, Urinary Titin N- Terminal Fragment, and Maximum Voluntary Contraction Torque after Eccentric Exercise of the Elbow Flexors. J Sports Sci Med 2023; 22:797-805. [PMID: 38045754 PMCID: PMC10690499 DOI: 10.52082/jssm.2024.797] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2023] [Accepted: 11/27/2023] [Indexed: 12/05/2023]
Abstract
The study aimed to investigate the relationships between the shear modulus of the biceps brachii (BB) and brachialis muscle (BA) and the total of the two (BB+BA), and urinary titin N-terminal fragment (UTF), maximum voluntary isometric contraction (MVC), and other indirect markers. Fifteen healthy men performed five sets of 10 eccentric contractions using a dumbbell corresponding to 50% of MVC at 90° measured at baseline. The elbow joint of the left arm was extended from 90° to 180° (180° = full extension) in 5 s in the exercise, and was returned with support from the examiner to prevent concentric contraction. Shear modulus of BB and BA were measured by ultrasound shear wave elastography, and UTF, MVC, and range of motion of the elbow joint (ROM) were recorded before; immediately after; and 1, 24, 48, 72, 96, and 168 h after the exercise. After calculating the shear modulus of BB and BA, two values were added (BB+BA). The shear modulus peaked at 48 h, UTF peaked at 96 h, MVC and ROM changed largest at immediately, and muscle soreness peaked at 48 h post-exercise. Significant (p < 0.05) relationships were found between changes in BB shear modulus and BA shear modulus (r = 0.874), BB+BA shear modulus (r = 0.977), UTF (r = 0.681), and MVC (r = -0.538). Significant (p < 0.05) relationships were also observed between changes in BA shear modulus and BB+BA shear modulus (r = 0.957), UTF (r = 0.682), MVC (r = -0.522), and ROM (r = -0.600). Moreover, significant (p < 0.05) relationships were observed between changes in BB+BA shear modulus and UTF (r = 0.703), MVC (r = -0.549), and ROM (r = -0.547). These results indicate that shear modulus of each muscle (i.e., BB and BA) provide more precise information about muscle damage than UTF, MVC and ROM.
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Affiliation(s)
| | | | | | | | | | | | - Naoya Nagata
- Institute of Physical Education, Keio University, Japan
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Inami T, Yamaguchi S, Nishioka T, Chida K, Hoshina K, Ito O, Hashimoto T, Murayama M. The Effect of Contrast Water Therapy on Dehydration during Endurance Training Camps in Moderate-Altitude Environments. Sports (Basel) 2023; 11:232. [PMID: 38133099 PMCID: PMC10747241 DOI: 10.3390/sports11120232] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2023] [Revised: 11/03/2023] [Accepted: 11/20/2023] [Indexed: 12/23/2023] Open
Abstract
The effects of contrast water therapy (CWT) on dehydration at moderate altitudes during training camps remain unknown. We hypothesized that CWT reduces dehydration resulting from training at moderate altitudes and improves performance, akin to conditions at sea level. A 13-day endurance training camp was held at a moderate altitude of 1100 m and included 22 university athletes, who were divided into two groups (CWT group, n = 12; control (CON) group, n = 10). The sample size was calculated based on an α level of 0.05, power (1 β) of 0.8, and effect size of 0.25 based on two-way ANOVA. Longitudinal changes over 13 days were compared using a two-group comparison model. Additionally, 16 athletes participated in an additional performance verification analysis. Subjective fatigue, body mass, and water content (total body water (TBW), extracellular water (ECW), and intracellular water) were measured using bioimpedance analysis every morning, and the titin N-terminal fragment in urine (UTF) was measured as an index of muscle damage. For performance verification, 10 consecutive jump performances (with the reactive strength index (RSI) as an indicator) were evaluated as neuromuscular function indices. The results indicated that the UTF did not significantly differ between the two groups. Moreover, the ECW/TBW values, indicative of dehydration, on days 4 and 5 in the CWT group were significantly lower than those in the CON group. However, there was no significant difference in RSI between the two groups. Therefore, although CWT reduces dehydration in the early stages of the training camp, it may not affect performance.
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Affiliation(s)
- Takayuki Inami
- Institute of Physical Education, Keio University, 4-1-1, Hiyoshi, Yokohama 223-8521, Japan
| | - Shota Yamaguchi
- Institute of Physical Education, Keio University, 4-1-1, Hiyoshi, Yokohama 223-8521, Japan
| | - Takuya Nishioka
- Institute of Physical Education, Keio University, 4-1-1, Hiyoshi, Yokohama 223-8521, Japan
| | - Kenta Chida
- Graduate School of System Design, Management, Keio University, 4-1-1, Hiyoshi, Yokohama 223-8521, Japan
| | - Kosaku Hoshina
- Graduate School of Media and Governance, Keio University, 5322, Fujisawa 252-0883, Japan
| | - Osamu Ito
- Sports Medicine Research Center, Keio University, 4-1-1, Hiyoshi, Yokohama 223-8521, Japan
- FOCS Inc., 1-3-47, Nakahara-Ward, Kawasaki 211-0025, Japan
| | - Takeshi Hashimoto
- Sports Medicine Research Center, Keio University, 4-1-1, Hiyoshi, Yokohama 223-8521, Japan
| | - Mitsuyoshi Murayama
- Institute of Physical Education, Keio University, 4-1-1, Hiyoshi, Yokohama 223-8521, Japan
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Barenie MJ, Escalera A, Carter SJ, Grange HE, Paris HL, Krinsky D, Sogard AS, Schlader ZJ, Fly AD, Mickleborough TD. Grass-Fed and Non-Grass-Fed Whey Protein Consumption Do Not Attenuate Exercise-Induced Muscle Damage and Soreness in Resistance-Trained Individuals: A Randomized, Placebo-Controlled Trial. J Diet Suppl 2023; 21:344-373. [PMID: 37981793 DOI: 10.1080/19390211.2023.2282470] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2023]
Abstract
Eccentric muscle contractions can cause structural damage to muscle cells resulting in temporarily decreased muscle force production and soreness. Prior work indicates pasture-raised dairy products from grass-fed cows have greater anti-inflammatory and antioxidant properties compared to grain-fed counterparts. However, limited research has evaluated the utility of whey protein from pasture-raised, grass-fed cows to enhance recovery compared to whey protein from non-grass-fed cows. Therefore, using a randomized, placebo-controlled design, we compared the effect of whey protein from pasture-raised, grass-fed cows (PRWP) to conventional whey protein (CWP) supplementation on indirect markers of muscle damage in response to eccentric exercise-induced muscle damage (EIMD) in resistance-trained individuals. Thirty-nine subjects (PRWP, n = 14; CWP, n = 12) completed an eccentric squat protocol to induce EIMD with measurements performed at 24, 48, and 72 h of recovery. Dependent variables included: delayed onset muscle soreness (DOMS), urinary titin, maximal isometric voluntary contraction (MIVC), potentiated quadriceps twitch force, countermovement jump (CMJ), and barbell back squat velocity (BBSV). Between-condition comparisons did not reveal any significant differences (p ≤ 0.05) in markers of EIMD via DOMS, urinary titin, MIVC, potentiated quadriceps twitch force, CMJ, or BBSV. In conclusion, neither PRWP nor CWP attenuate indirect markers of muscle damage and soreness following eccentric exercise in resistance-trained individuals.
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Affiliation(s)
- Matthew J Barenie
- Department of Kinesiology, School of Public Health-Bloomington, IN University, Bloomington, Indiana, USA
- Center for the Study of Obesity, College of Public Health, University of AR for Medical Sciences, Little Rock, Arkansas, USA
| | - Albaro Escalera
- Department of Kinesiology, School of Public Health-Bloomington, IN University, Bloomington, Indiana, USA
| | - Stephen J Carter
- Department of Kinesiology, School of Public Health-Bloomington, IN University, Bloomington, Indiana, USA
| | - Hope E Grange
- Department of Applied Health Science, School of Public Health-Bloomington, Indiana University, Bloomington, Indiana, USA
| | - Hunter L Paris
- Department of Sports Medicine, Pepperdine University, Malibu, California, USA
| | - Danielle Krinsky
- Department of Kinesiology, School of Public Health-Bloomington, IN University, Bloomington, Indiana, USA
| | - Abigail S Sogard
- Department of Kinesiology, School of Public Health-Bloomington, IN University, Bloomington, Indiana, USA
| | - Zachary J Schlader
- Department of Kinesiology, School of Public Health-Bloomington, IN University, Bloomington, Indiana, USA
| | - Alyce D Fly
- Department of Nutrition and Health Science, Ball State University, Muncie, Indiana, USA
| | - Timothy D Mickleborough
- Department of Kinesiology, School of Public Health-Bloomington, IN University, Bloomington, Indiana, USA
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