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172 results on '"Yoshida, Riku"'

5. Relationship Between Nordic Hamstring Strength and Single Leg Bridge Test in University Soccer Players.

Author

Murakami, Yuta, Nishida, Satoru, Yoshida, Riku, Kasahara, Kazuki, Kumazaki, Akira, Sakuma, Hirokazu, Fujimoto, Hirosi, Kaneko, Yuki, Abe, Otoka, and Nakamura, Masatoshi

Subjects
HAMSTRING muscle physiology, SPORTS injuries risk factors, SOCCER, STATISTICS, CROSS-sectional method, MUSCLE strength testing, SPRAINS, RISK assessment, PEARSON correlation (Statistics), MUSCLE strength, UNIVERSITIES & colleges, DESCRIPTIVE statistics, DATA analysis, DATA analysis software, DISEASE risk factors
Abstract

Context: Nordic hamstring strength (NH strength) and single leg bridge test (SLBT) scores are used to predict the risk of hamstring strain injury. Although NH strength and SLBT scores may be related, the relationship between NH strength and SLBT score remains unknown. Objectives: This study investigated the relationship between NH strength and SLBT scores in university soccer players. Design: Cross-sectional study. Setting: Research laboratory. Participants: 38 male university soccer players. Main Outcome Measures: NH strength and SLBT scores. Interventions: A participant was instructed to lean forward gradually at the slowest possible speed from a kneeling posture with the knee joint flexed 90° for the NH strength measurement. Participants in the SLBT crossed their arms over their chests, pushed down from their heels, and lifted their hips off the ground as many times as they could until they failed. We investigated the relationship between NH strength and SLBT scores in the left and right sides using Spearman rank correlation coefficient. Additionally, we calculated the percentage of left–right asymmetry in NH strength and SLBT scores and investigated the relationship between these variables using Pearson correlation coefficient. Results: There were no significant correlations between NH strength and SLBT scores in the right (rs =.239, P =.16) and left (rs =.311, P =.065) legs. Furthermore, there was no significant relationship between NH strength and SLBT between-limb asymmetry (r =.073, P =.671). Conclusions: NH strength and SLBT scores could be different indexes, indicating either maximal muscle strength or muscle endurance. Thus, the findings suggested that when assessing risk factors for hamstring strain injury, both NH strength and SLBT scores should be measured. [ABSTRACT FROM AUTHOR]

Published
2024
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12. Minimum Intensity of Daily Six Eccentric Contractions to Increase Muscle Strength and Size.

Author

Yoshida, Riku, Murakami, Yuta, Kasahara, Kazuki, Sato, Shigeru, Nosaka, Kazunori, and Nakamura, Masatoshi

Subjects
*ELBOW physiology, *EXERCISE physiology, *RESEARCH funding, *EXERCISE intensity, *DESCRIPTIVE statistics, *TORQUE, *MUSCLE strength, *STRENGTH training, *HYPOTHESIS, *MUSCLE contraction, *BICEPS brachii
Abstract

Our previous study showed that daily six maximal eccentric contractions that were performed 5 days a week for 4 weeks increased maximal voluntary isometric (MVC‐ISO), concentric (MVC‐CON), and eccentric contraction (MVC‐ECC) strength of the elbow flexors and muscle thickness of biceps brachii and brachialis (MT) by 8.3 ± 4.9%, 11.1 ± 7.4%, 13.5 ± 11.5%, and 10.6 ± 5.1%, respectively. In the present study, we tested the hypothesis that the muscle strength and MT would still increase when the training intensity was reduced to 2/3 or 1/3 of the peak MVC‐ECC torque. Thirty‐six healthy young (19–24 years) adults who had not performed resistance training were placed to three groups (n = 12/group): 2/3MVC or 1/3MVC that performed six eccentric contractions with 2/3 or 1/3 MVC‐ECC load using a dumbbell 5 days a week for 4 weeks or control group that did not perform any training. Changes in the MVC‐ISO, MVC‐CON, MVC‐ECC torque, and MT before and after the 4‐week period were compared among the groups and with the group of the previous study in which six maximal eccentric contractions were performed 5 days a week for 4 weeks (MVC group; n = 12). The control and 1/3MVC groups showed no significant changes in any measures. Significant (p < 0.05) increases in MVC‐ISO (10.3 ± 11.4%), MVC‐CON (10.9 ± 9.5%), and MVC‐ECC (9.3 ± 8.8%) torque and MT (10.1 ± 9.2%) were observed for the 2/3MVC group. These changes were not significantly different from those of the MVC group. These results suggest that the 2/3‐intensity eccentric contractions with a dumbbell are as effective as maximal‐intensity isokinetic eccentric contractions to induce muscle adaptations. [ABSTRACT FROM AUTHOR]

Published
2024
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20. Acute effects of resistance training at different range of motions on plantar flexion mechanical properties and force.

Author

Murakami, Yuta, Konrad, Andreas, Kasahara, Kazuki, Yoshida, Riku, Warneke, Konstantin, Behm, David G, and Nakamura, Masatoshi

Subjects
BIOMECHANICS, EXERCISE physiology, DATA analysis, STRETCH (Physiology), SKELETAL muscle, RESEARCH funding, CALF muscles, DESCRIPTIVE statistics, TORQUE, RESISTANCE training, STATISTICS, PLANTARFLEXION, ANKLE joint, RANGE of motion of joints, MUSCLE contraction
Abstract

The effects obtained from resistance training depend on the exercise range of motion (ROM) performed. We aimed to examine the acute effects of different exercise ROM resistance training on the plantar flexor muscles. Eighteen healthy untrained male adults participated in three conditions: calf raises in 1) partial condition [final (short muscle length) partial ROM], 2) full condition (full ROM), and 3) control condition. The ankle dorsiflexion (DF) ROM, passive torque at DF ROM, passive stiffness of muscle-tendon unit, and maximal voluntary isometric contraction (MVC-ISO) torque were measured before and immediately after the interventions. There were significant increases in DF ROM, passive torque at DF ROM, and a decrease in MVC-ISO, but no significant interaction in passive stiffness. Post hoc test, DF ROM demonstrated moderate magnitude increases in the full condition compared to the partial (p = 0.023, d = 0.74) and control (p = 0.003, d = 0.71) conditions. Passive torque at DF ROM also showed moderate magnitude increases in the full condition compared to the control condition (p = 0.016, d = 0.69). MVC-ISO had a moderate magnitude decrease in the full condition compared to the control condition (p = 0.018, d=−0.53). Resistance training in the full ROM acutely increases joint ROM to a greater extent than final partial ROM, most likely due to stretch tolerance. [ABSTRACT FROM AUTHOR]

Published
2024
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42. The Combined Effect of Static Stretching and Foam Rolling With or Without Vibration on the Range of Motion, Muscle Performance, and Tissue Hardness of the Knee Extensor

Author

Nakamura, Masatoshi, Konrad, Andreas, Kasahara, Kazuki, Yoshida, Riku, Murakami, Yuta, Sato, Shigeru, Aizawa, Kodai, Koizumi, Ryoma, and Wilke, Jan

Abstract

Nakamura, M, Konrad, A, Kasahara, K, Yoshida, R, Murakami, Y, Sato, S, Aizawa, K, Koizumi, R, and Wilke, J. The combined effect of static stretching and foam rolling with or without vibration on the range of motion, muscle performance, and tissue hardness of the knee extensor. J Strength Cond Res37(2): 322–327, 2023—Although the combination of static stretching (SS) and foam rolling (FR) is frequently used for warm-up in sports, the effect of the intervention order is unclear. This study compared mechanical tissue properties, pain sensitivity, and motor function after SS and FR (with and without vibration) performed in different orders. Our randomized, controlled, crossover experiment included 15 healthy male subjects (22.5 ± 3.3 years) who visited the laboratory 5 times (inactive control condition, FR + SS, FRvibration+ SS, SS + FR, and SS + FRvibration) with an interval of ≥48 hours. In each session, subjects completed three 60-second bouts of FR and SS, targeting the anterior thigh. Pressure pain threshold, tissue hardness, knee flexion range of motion (ROM), maximal voluntary isometric (MVC-ISO), and concentric (MVC-CON) torque, as well as countermovement jump height, were determined before and after the intervention. All interventions significantly (p< 0.01) increased knee flexion ROM (d= 0.78, d= 0.87, d= 1.39, and d= 0.87, respectively) while decreasing tissue hardness (d= −1.25, d= −1.09, d= −1.18, and d= −1.24, respectively). However, MVC-ISO torque was significantly reduced only after FR + SS (p= 0.05, d= −0.59). Our results suggest that SS should be followed by FR when aiming to increase ROM and reduce tissue hardness without concomitant stretch-induced force deficits (MVC-ISO, MVC-CON, and countermovement jump height). Additionally, adding vibration to FR does not seem to affect the magnitude of changes observed in the examined outcomes.

Published
2023
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48. Local and non-local effects of foam rolling on passive soft tissue properties and spinal excitability

Author

Nakamura, Masatoshi, Konrad, Andreas, Kiyono, Ryosuke, Sato, Shigeru, Yahata, Kaoru, Yoshida, Riku, Yasaka, Koki, Murakami, Yuta, Sanuki, Futaba, and Wilke, Jan

Subjects
musculoskeletal diseases, shear elastic modulus, H/M ratio, dorsiflexion range of motion, Physiology, ddc:790, cross-transfer effect, ddc:610, musculoskeletal system, roller massage, Original Research
Abstract

In sports and clinical settings, roller massage (RM) interventions are used to acutely increase range of motion (ROM); however, the underlying mechanisms are unclear. Apart from changes in soft tissue properties (i.e., reduced passive stiffness), neurophysiological alterations such as decreased spinal excitability have been described. However, to date, no study has investigated both jointly. The purpose of this trial was to examine RM’s effects on neurophysiological markers and passive tissue properties of the plantar flexors in the treated (ROLL) and non-treated (NO- ROLL) leg. Fifteen healthy individuals (23 ± 3 years, eight females) performed three unilateral 60-s bouts of calf RM. This procedure was repeated four times on separate days to allow independent assessments of the following outcomes without reciprocal interactions: dorsiflexion ROM, passive torque during passive dorsiflexion, shear elastic modulus of the medial gastrocnemius muscle, and spinal excitability. Following RM, dorsiflexion ROM increased in both ROLL (+19.7%) and NO-ROLL (+13.9%). Similarly, also passive torque at dorsiflexion ROM increased in ROLL (+15.0%) and NO-ROLL (+15.2%). However, there were no significant changes in shear elastic modulus and spinal excitability (p > 0.05). Moreover, significant correlations were observed between the changes in DF ROM and passive torque at DF ROM in both ROLL and NO-ROLL. Changes in ROM after RM appear to be the result of sensory changes (e.g., passive torque at DF ROM), affecting both rolled and non-rolled body regions. Thus, therapists and exercise professionals may consider applying remote treatments if local loading is contraindicated.

Published
2021

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