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Volume 53 (2004)
- Issue 6 Pages 599-
- Issue 5 Pages 483-
- Issue 4 Pages 379-
- Issue 3 Pages 281-
- Issue 2 Pages 197-
- Issue 1 Pages 1-
Volume 53, Issue 5
Displaying 1-12 of 12 articles from this issue
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SHIN HASEGAWA, TOSHIKI TACHI, KEIICHI SAITO, LIQUN WANG, KIYOTADA KATO2004 Volume 53 Issue 5 Pages 483-492
Published: October 01, 2004
Released on J-STAGE: September 30, 2010
JOURNAL FREE ACCESSThe purpose of this study was to investigate muscle volume (MV) and strength characteristics of the rotator cuff (supraspinatus, infraspinatus, teres minor, and subscapularis) and deltoid muscles in each shoulder of asymptomatic baseball pitchers. Twelve collegiate baseball pitchers (PG) and ten male students (CG) who never played an overhand sports volunteered to participate in this study. Magnetic resonance imaging (Straits II, Hitachi Medico, 1.5 T) was used to measure the MV of rotator cuff and deltoid muscles in both shoulders of each subject. Since the individual muscles were difficult to identify on MRI scans, the infraspinatus and teres minor were analyzed as one infraspinatus muscle. Shoulder abduction (ABD), external rotation (ER), and internal rotation (IR) strengths were measured each side using a hand-held dynamometer (Power Track II, Jtech Medical Industry) . The MV of deltoid muscle was significantly larger value on the dominant side (DOM) than on the non-dominant side (NDOM) in both the PG and CG groups (p<0.05) . However, no significant differences in the MV of the rotator cuff muscles and the measured shoulder strength (ABD, ER, and IR) were observed between both sides in either group. Similarly, no significant differences in the DOM/NDOM ratio of the muscle volume and the measured shoulder strength were observed between the two groups. These results suggest that the rotator cuff muscle volume and strength does not differ in both sides of the PG, and DOM/NDOM ratios of the rotator cuff muscle volume and strength of the PG does not differ in those of the CG.View full abstractDownload PDF (2615K) -
YOKO NAKAO, KENJI HIRANUMA, MASAKI ASHIHARA, HIDEO MORITA, YASUSHI TAK ...2004 Volume 53 Issue 5 Pages 493-501
Published: October 01, 2004
Released on J-STAGE: September 30, 2010
JOURNAL FREE ACCESSThe purpose of this study was to investigate characteristics of past injuries of female university soccer players in comparison with injuries in male university soccer players.
We investigated past injuries of female players (n=32) and male players (n=24) . A past injury was defined as any injury sustained during soccer that required admission to a team doctor, medical attention or absence from practices or games for more than seven days.
The most frequent injury was Joint Injuries in both female and male players. High occurrence of overuse injuries of lower leg was most apparent in the female players. The 32 female players had experienced 144 injuries, or 4.5 injuries per player, and the 24 male players had suffered 85 injuries, or 3.5 injuries per player. The numbers of injuries per player of female players were 1.3 times higher than the male players. Also, the incidence of injury was 0.64 (injury/player/year) in female players, and 0.27 (injury/player/year) in male players. The incidence of injury of female players was significantly larger than that of male players.
We conclude that the prevention and care of overuse injuries in lower leg is very important for female succor players.View full abstractDownload PDF (1084K) -
SUGURU TORII, NAOMI TORII, HIROYUKI WATANABE2004 Volume 53 Issue 5 Pages 503-507
Published: October 01, 2004
Released on J-STAGE: September 30, 2010
JOURNAL FREE ACCESSA preparticipation examination for athletes should be performed to prevent severe athletic injury by examining physical characteristics related to various injuries. The general joint laxity test has been included among the check-up items considering as relating factor of joint injury. Authors investigated the relationship between the score of general joint laxity for freshmen examination and the incidence of major joint injury, during the succeeding 5 athletic seasons, in eighty-seven collegiate American football players.
Significant higher scores were observed in athletes affected by shoulder injury, and slightly higher scores in those affected by knee joint injury. But, the scores were similar between athletes with and without elbow or ankle injury.
The degree of laxity was associated with shoulder and knee joint injury in a comparison of incidence of these injuries among tight, medium and lax groups.
Authors concluded that general joint laxity is related to the incidence of shoulder and knee joint injury.View full abstractDownload PDF (468K) -
TAKASHI YAMADA, MASANOBU WADA2004 Volume 53 Issue 5 Pages 509-517
Published: October 01, 2004
Released on J-STAGE: September 30, 2010
JOURNAL FREE ACCESSThe effect of hyperthyroidism on the contractile properties and Ca2+ sequestering abilities by the sarcoplasmic reticulum (SR) in the soleus muscles was examined in rats treated with thyroid hormone (3, 5, 3'-triiodo-L-thyronine, T3) (300μg/kg body weight) for 3, 7 and 21 days. At the end of a given treatment period, the right or left soleus muscle was mounted isometrically at 30°C, and stimulated directly using supramaximal current intensity. A twitch contraction was elicited by a 1 msec square-wave pulse and a tetanic contraction by 20 Hz stimulation for 600 msec. To evaluate fatigue resistance, muscles were stimulated at 40 Hz for 350 msec with tetani repeated at an interval of 2 sec during a 4-min period. Another soleus muscle was used, for analysis of SR Ca2+ -uptake rate and SR Ca2+ -ATPase activity. Pronounced increases in SR Ca2+ -uptake rate and ATPase activity were observed after T3 treatment periods longer than 6 days. These alterations were accompanied by decreases in twitch and tetanic tension, half-relaxation time, and fatigue resistance. The T3-treated muscles stimulated at 20 Hz relaxed during the interval between successive stimuli, indicating that the mechanical fusion of tetanic contractions was incomplete. SR Ca2+ uptake rate was significantly correlated both to tetanic tension and to fatigue resistance. These data suggest that there may be a causal relationship between changes in SR Ca2+ uptake and the loss of muscular strength in the hyperthyroid soleus.View full abstractDownload PDF (994K) -
THE INFLUENCE OF REGULAR POST-EXERCISE COLD APPLICATION ON EXERCISED MUSCLES WITH ENDURANCE TRAININGMOTOI YAMANE, NORIKAZU OHNISHI, MITSUO KOSAKA2004 Volume 53 Issue 5 Pages 519-526
Published: October 01, 2004
Released on J-STAGE: September 30, 2010
JOURNAL FREE ACCESSThe purpose of this study was to investigate the influence of regular post-exercise cold application on adaptive changes in aerobic capacity of exercised muscles in association with endurance training. Six male subjects performed 25 minutes of bicycle exercise at a workload of 70% of maximal O2 uptake (VO2max) four times a week for four weeks. During this training period, the subjects immersed one leg in cold water (5±1°C) for 2 periods of 20 minutes after every training session, with a 30-minute interval between immersions. Significant increases in performance time, VO2max, and ventilation threshold (VT) measured by a two-legged incremental cycle ergometer test (p<0.01, p<0.05, p<0.01, respectively) were observed after the training period. In the one-legged incremental exercise test, although significant increase in performance time was detected for the control side (p<0.05), no such increase was seen after the training period for the cold application side. Although one-legged VO2max did not change significantly on either side after the training period, post-training/pre-training ratio for one-legged VO2max was significantly lower on the cold application side compared with the control side (p<0.05) . Further studies are required in order to confirm and elucidate a possible attenuation of improvement in aerobic capacity with endurance training resulting from the regular post-exercise application of cold.View full abstractDownload PDF (1005K) -
KOH MIZUNO, MINORU KUNII, TAKAKI SEITA, SHIGEYUKI ONO, YOKO KOMADA, SH ...2004 Volume 53 Issue 5 Pages 527-536
Published: October 01, 2004
Released on J-STAGE: September 30, 2010
JOURNAL FREE ACCESSThe present study performed a cross-sectional survey to investigate sleep habits and sleep health in Japanese women aged 40 to 69 years with and without a habit of exercise. A standardized questionnaire evaluating sleep was administered to two subject groups. One was the “exercise group” who habitually performed aerobic exercise at mild to moderate intensity with a frequency of ≥2 times/week and duration of ≥30 minutes/one session (n=207) . The other was the age-matched “non-exercise group” who had no exercise habit (n=567) . Two-way ANOVA was employed for com paring the two subject groups and examining the effects of exercise on aging. Regarding sleep habits, as bed time significantly advanced with advancing age, sleep habits (bed time, waking time and sleep duration) were significantly more regular in the exercise group than in the non-exercise group. Concerning independent sleep health risk factors consisting of sleep initiation, sleep maintenance, sleep apnea, parasomnia, and waking-up, the factor score for sleep maintenance significantly deteriorated with advancing age; and was significantly better in the exercise group than in the non-exercise group. These results suggest that an exercise habit may improve sleep health in middle-aged and older Japanese women among which a higher prevalence of sleep problems has been reported.View full abstractDownload PDF (1259K) -
KAZUHIRO TODOROKI, TAKAO SUGIURA, KATSUMASA GOTO, HISASHI NAITO, TOSHI ...2004 Volume 53 Issue 5 Pages 537-547
Published: October 01, 2004
Released on J-STAGE: September 30, 2010
JOURNAL FREE ACCESSIt has been demonstrated that exercise induces heat shock proteins (HSPs) . However, no study has investigated changes in HSPs following endurance training at different speeds. Therefore, this study was designed to investigate the effect of treadmill training at different running speeds on induction HSPs. One group of male Wistar rats was assigned as a sedentary control, three groups were assigned for exercise training (10 m/min, 20 m/min and 30 m/min) and another three groups for one acute bout of exercise (10 m/min, 20 m/min and 30 m/min) . Each training group ran at each speed for 30 min/day, 5 days a week for 8 weeks. The acute exercise group performed the exercise only once. Forty-eight hours after the last exercise session was completed, the rats were sacrificed and the plantaris (PLA) and soleus (SOL) muscles were dissected. In the acute exercise group, the content of HSP72 in both the PLA and SQL increased (p<0.05) at all speeds, and the content of HSP60 increased significantly (p<0.05) at all speeds for the PLA, but not for the SOL. On the other hand, in the endurance group, the content of HSP72 and HSP60 in both muscles increased in 30 m/min groups. These results indicate that an increase in HSP72 and HSP60 by endurance training is induced by high intensity training in both muscles. This was not found to be the case with the acute exercise groups.View full abstractDownload PDF (1266K) -
VALIDITY OF LOCATION OF MUSCULAR UNITS ESTIMATED THROUGH INVERSE ANALYSIS OF SURFACE ELECTROMYOGRAMSKENJI SAITOU, TADASHI MASUDA, MORIHIKO OKADA2004 Volume 53 Issue 5 Pages 549-557
Published: October 01, 2004
Released on J-STAGE: September 30, 2010
JOURNAL FREE ACCESSWe have developed a method for estimating the depth and intensity of muscular unit represented as equivalent current dipoles by the inverse analysis of surface electromyograms (EMGs) . In this study, the validity of the locations of current dipoles estimated through the inverse analysis was verified by animal experiments. Surface motor unit action potentials (MUAPs) were recorded from the gastrocnemius muscle activated by electrical stimulation at the ventral root of lumbar spinal cord (L4 or L5) of rats. After recording the surface MUAPs for the inverse analysis and glycogen depletion of active muscle fibers by repeated electrical stimulation, periodic acid-Schiff (PAS) staining was used to determine the position of muscle fibers belonging to an active single motor unit. In the results of the inverse analysis, the values of ‘goodness of fit’ between measured and calculated MUAP were 71%, 79% and 85%. Estimated depths of current dipoles ranged from 1.8 mm to 5.9 mm. The locations estimated through the inverse analysis were more medial and shallower than the actual distribution of active muscle fibers determined by PAS staining. These errors were probably caused by the effects of the boundary in the model, the relationship between the measurement area and the location of an active motor unit, and the artifacts such as deformation of the muscle during dissection and freezing.View full abstractDownload PDF (989K) -
MUNESHIGE SHIMIZU, KOTARO FUJITA, JUN ICHIKAWA, FUMIKI MORIMATSU, NAOK ...2004 Volume 53 Issue 5 Pages 559-566
Published: October 01, 2004
Released on J-STAGE: September 30, 2010
JOURNAL FREE ACCESSThe present study was designed to examine the positive impact of collagen and glucosamine hydrate supplementation on joint markers, matrix metalloproteinase-3 (MMP-3), tissue inhibitor of metalloproteinases-1 (TIMP-1) and keratane sulfate (KS) . Thirteen healthy fun-runners supplemented collagen and glucosamine hydrate for 30 days. Blood samples were collected on days 0, 15 and 30. The test-drink supplement, however, significantly decreased MMP-3 and KS on days 15 and 30. These results suggest that the supplementation of collagen and glucosamine hydrate may prevent injury and inflammation of joint cartilages and be useful for joint conditions.View full abstractDownload PDF (842K) -
[in Japanese]2004 Volume 53 Issue 5 Pages 567-573
Published: October 01, 2004
Released on J-STAGE: September 30, 2010
JOURNAL FREE ACCESSDownload PDF (5298K) -
2004 Volume 53 Issue 5 Pages 579-589
Published: October 01, 2004
Released on J-STAGE: September 30, 2010
JOURNAL FREE ACCESSDownload PDF (1752K) -
2004 Volume 53 Issue 5 Pages 590-599
Published: October 01, 2004
Released on J-STAGE: September 30, 2010
JOURNAL FREE ACCESSDownload PDF (1594K)
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