Japanese Journal of Physical Fitness and Sports Medicine
Online ISSN : 1881-4751
Print ISSN : 0039-906X
ISSN-L : 0039-906X
Search
Advanced search
OR
Browse
Search
Volume 59, Issue 4
Displaying 1-13 of 13 articles from this issue
Show all abstracts
    • |<
    • <
    • 1
    • >
    • >|
Original
  • EFFECTS OF ECCENTRIC CONTRACTIONS ON IN VITRO Na+-K+-ATPase ACTIVITY AND SARCOPLASMIC RETICULUM Ca2+-SEQUESTERING IN RAT SKELETAL MUSCLE
    KEITA KANZAKI, MAI KURATANI, SATOSHI MATSUNAGA, TAKAAKI MISHIMA, SACHI ...
    2010 Volume 59 Issue 4 Pages 337-348
    Published: 2010
    Released on J-STAGE: September 15, 2010
    DOIhttps://doi.org/10.7600/jspfsm.59.337
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    The purpose of this study was to examine the effects of eccentric contractions (Ecc) on cation (i.e., K+, Na+ and Ca2+) regulation in skeletal muscle. The left anterior crural muscles of male Wistar rats were subjected in vivo to either Ecc or isometric contrations (Iso) for 200 cycles. The extensor digitorum longus and tibialis anterior muscles were removed immediately after and 2, 4 and 6 days following contractions and used for measures of force output and biochemical analyses, respectively. Ecc led to a 75% decrease in maximal tetanic force. Decreased force output did not revert to pre-exercise levels during 6 days of recovery. Sarcoplasmic reticulum (SR) Ca2+-ATPase activity was reduced by 52 and 60% 4 and 6 days after Ecc, respectively. The reduction in catalytic activity after 6 days was accompanied by a 63% decrease in SR Ca2+-ATPase protein and an approximately 3.5-fold increase in calpain activity. Na+-K+-ATPase acticity was decreased by 23% immediately after Ecc and restored during 2 days of recovery. These alterations were specific for Ecc and not observed for Iso. These results suggest that disturbances in cation regulation may account, at least partly, for Ecc-induced decreases in force and power which can take a number of days to recover and that the decrease in SR Ca2+-ATPase activity would result from the degradation of the enzyme.
    View full abstract
    Download PDF (398K)
  • THE RELATION BETWEEN ISOTONIC LEG EXTENSION STRENGTH AND THE PREVALENCE OF METABOLIC SYNDROME IN MALE ADULTS
    DAISUKE MINAMISHIMA, KAIJUN NIU, HARUKI MOMMA, YORITOSHI KOBAYASHI, LE ...
    2010 Volume 59 Issue 4 Pages 349-356
    Published: 2010
    Released on J-STAGE: September 15, 2010
    DOIhttps://doi.org/10.7600/jspfsm.59.349
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    [Purpose] To investigate the relation between isotonic leg extension strength (ILES) and the prevalence of metabolic syndrome (MS) in Japanese male adults.
    [Methods] This cross-sectional study included 395 Japanese men. Metabolic syndrome was determined according to the criteria of International Diabetes Federation (IDF), Japan Society for the Study of Obesity (JASSO), or National Cholesterol Education Program's Adults Treatment Panel III (NCEP-ATPIII). Muscular strength was measured on a horizontal dynamometer. Subjects were divided into tertile levels according to ILES (watts/kg). Multiple logistic regression analysis was used to examine the relation between ILES levels and the prevalence of MS.
    [Results] The prevalence of MS were 14.4% (IDF), 17.0%(JASSO), and 20.0% (NCEP-ATPIII). After adjustment for confounding factors, the odd's ratios (95% confidence interval) of MS (IDF) compared with the lowest ILES level were 0.90 (0.48-1.68) and 0.31 (0.13-0.64) in the middle and high levels of ILES (p for trend=0.03). The association between the level of ILES and the prevalence of MS by JASSO and NCEP-ATPIIIcriteria were similar.
    [Conclusion] The prevalence of MS was associated with the level of ILES.
    View full abstract
    Download PDF (358K)
  • DIFFERENCE BETWEEN UPPER AND LOWER LUMBAR SPINE LORDOSIS ON THE BASIS OF THE HIP EXTENSION RANGE
    TAKUYA IBARA, TSUYOSHI AKIMOTO, HIROMUNE OBAYASHI, YUKI YAMANAKA, YUKI ...
    2010 Volume 59 Issue 4 Pages 357-362
    Published: 2010
    Released on J-STAGE: September 15, 2010
    DOIhttps://doi.org/10.7600/jspfsm.59.357
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Decrease in the hip extension range of motion (HE-ROM) can cause lumbar hyperlordosis. Hyperlordosis is one of the mechanisms underlying low back pain. A diagnosis of low back pain from hyperlordosis can be used to detect the area in which hyperlordosis occurs more easily—the upper or lower lumbar spine. Twenty-one men were recruited for this study. HE-ROM was measured manually. Lumbar alignment was measured on a bed in a prone position. We extended the subject's hip by bending the bed at 4 angles (0°, 10°, 15°, 30°) and measured the spinal alignment by using a SpinalMouse. The results showed that lumbar lordosis increased at the bed angles of 15°and 30°. Only when the bed angle was changed from 0° to 30°, the increased angle of the lumbar spine was negatively correlated to the HE-ROM (r=-0.46, p<0.05), particularly that of the lower lumbar spine (r=-0.47, p<0.05). These findings suggested that lower lumbar lordosis tends to increase in individuals with poor HE-ROM. Additionally, increase in lower lumbar lordosis is attributed to the tendency to have low back pain in the lower lumbar spine.
    View full abstract
    Download PDF (323K)
  • THE EFFECTS OF COMBINED EXERCISE ON CARDIAC FUNCTION AND ADIPOCYTOKINE CONCENTRATION ACCORDING TO ACE GENOTYPE IN ABDOMINAL OBESE MIDDLE AGED MEN
    SOO-MAN MOON, SANG-KAB PARK, YOO-CHAN KWON
    2010 Volume 59 Issue 4 Pages 363-374
    Published: 2010
    Released on J-STAGE: September 15, 2010
    DOIhttps://doi.org/10.7600/jspfsm.59.363
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    The purpose of this study was to investigate the effects of combined exercise on visceral fat, cardiac function, adipocytokine, and NT-pro BNP concentration according to angiotensin-converting enzyme(ACE) genotype in obese middle aged men. Fifty three obese men (II type: 18, ID type: 20, DD type: 15), ratio of visceral and subcutaneous were over 0.4, were enrolled in the study. The combined exercise program included stretching, resistance training, aerobic exercise, and yoga. The exercise was conducted for 60 minutes, 4 times a week for 12 week period. ACE genotype was determined using a polymerase chain reaction (PCR), and the genetic subtype was classified in three patterns e.g. II, ID, DD. As a results, body weight, BMI, and WHR significantly decreased after 12 weeks of combined exercise in ID type and DD type. Body fat(%), visceral fat and V/S significantly decreased after 12 weeks in DD type. HDL-C and LDL-C significantly improved in II, ID and DD type. Cardiac structure decreased in all genotype and cardiac function increased in DD type. IL-6 and NT-pro BNP, the risk factors of cardiovascular disease, were significantly decreased in DD type, after 12 weeks. Therefore, exercises have shown to be most effective in type DD which is also considered as the risk of cardiovascular diseases. Among all the ACE genotype, DD type requires the most exercise.
    View full abstract
    Download PDF (524K)
  • COMPARISON OF THE GAIT OF WOMEN WITH A LOAD ON THEIR BELLY AND THAT OF PREGNANT WOMEN
    HIROKI AOYAMA, YOSUKE YAMADA, MASAHIRO SHINYA, HIDEAKI KUSUMOTO, SHING ...
    2010 Volume 59 Issue 4 Pages 375-388
    Published: 2010
    Released on J-STAGE: September 15, 2010
    DOIhttps://doi.org/10.7600/jspfsm.59.375
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Gait analysis was conducted on 7 healthy pregnant women (pregnant group) and 6 non-pregnant women (pseudo-pregnant group) using a 3-D motion analysis system (VICON 460) and two forceplates (Kistlar 9286A). The data was collected at 8-9 months of gestation (pregnant condition) and 4-8 months postpartum (non-pregnant condition) in the pregnant group. In the pseudo-pregnant group, the participants walked with a 5kg-load on their belly (pregnant condition) and without any load (non-pregnant condition). Comparisons using two-way ANOVAs with repeated measures were conducted. Interaction of group × condition was not observed in the measured gait parameters except the angle of the maximum hip adduction. Main effect in the condition and the group was found in some parameters. In the pregnant condition, gait velocity was slower (pregnant group 68.7±8.6 m/min pseudo-pregnant group 63.8±4.8 m/min) than in the non-pregnant condition (pregnant group 75.5±3.2 m/min pseudo-pregnant group 69.8±8.7 m/min). The second vertical peak ground reaction force was smaller in the pregnant condition (pregnant group 105.4±4.8 % pseudo-pregnant group 108.4±6.3 % of body-weight) than in the non-pregnant condition (pregnant group 114.3±7.4 % pseudo-pregnant group 113.5±4.2 % of body-weight). These results demonstrated that pregnant condition changed kinetic and kinematic characteristics of the gait.
    View full abstract
    Download PDF (556K)
  • DEVELOPMENT OF THE PREDICTION SYSTEM FOR THE ONSET OF THROWING SHOULDER INJURY ∼WITH LOGISTIC REGRESSION ANALYSIS∼
    TAKEO ISHII, NAOKI MUKAI, SHUMPEI MIYAKAWA
    2010 Volume 59 Issue 4 Pages 389-394
    Published: 2010
    Released on J-STAGE: September 15, 2010
    DOIhttps://doi.org/10.7600/jspfsm.59.389
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    The purpose of this study is to identify the risk factors which affect the consecutive onset of throwing shoulder injury of a collegiate baseball team, and to calculate regression formula which could predict the future onset.
    Prospective study. The subjects are 69 asymptomatic collegiate baseball players. We executed medical checkups and investigated who got throwing shoulder injury during this year. We did logistic regression analysis with the medical checkup findings and the data of the onset and found out the factors which significantly affected the onset. We also calculated Odds ratio of these factors and regression formula which predict the probability of the onset of throwing shoulder injury and evaluated the validity of regression model.
    52%(36/69 cases) of the players suffered throwing shoulder injury during this year. Among the medical checkup findings of asymptomatic phase, pitcher and catcher, past history of throwing shoulder injury, abnormality of scapula-humeral rhythm, heel-buttock distance were thought to be the risk factors which were near-related to the onset of throwing shoulder injury. We calculated regression formula using the medical checkup findings of asymptomatic phase and we could predict the onset of throwing shoulder injury with 82.5% accuracy.
    In order to prevent this injury, the method used in this study could be useful for field players to predict the onset of throwing shoulder injury.
    View full abstract
    Download PDF (439K)
  • EFFECTS OF PHYSICAL EXERCISE ON FEMORAL BONE MINERAL DENSITY AND OSTEOCYTE MICROMORPHOLOGY IN YOUNG OVARIECTOMIZED (OVX) RATS
    TOSHIKAZU KAWAKAMI, SADAFUMI TAKISE, HIROSHI KAWATA
    2010 Volume 59 Issue 4 Pages 395-406
    Published: 2010
    Released on J-STAGE: September 15, 2010
    DOIhttps://doi.org/10.7600/jspfsm.59.395
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    To investigate the effects of exercise on femoral regional bone mineral density and osteocyte micromorphology in young ovariectomized (OVX) rats, animals were divided into an ovariectomized group (OVX group), an ovariectomized + exercise group (OVX + exercise group), and a sham surgery group (SHAM group). Femoral bone mineral density was significantly lower in the OVX and OVX + exercise groups than in the SHAM group. A large difference in bone mineral density in the distal femoral epiphysis was observed between the OVX and OVX + exercise groups. In the OVX group, bone lacunae showed less immunostaining for DMP-1(dentin matrix protein-1) and osteocyte processes were fewer than in the SHAM group. In the OVX + exercise group, osteocyte processes were thicker (0.44 to 0.66 μm) than in the OVX group (0.22 to 0.26 μm). These results indicate that exercise induced structural changes in the femur, including formation of osteocyte processes and strengthening of the communication network between osteocytes.
    View full abstract
    Download PDF (1481K)
  • VALIDATION OF A TWO-DIMENSIONAL MOTION ANALYSIS TECHNIQUE FOR QUANTIFYING DYNAMIC KNEE VALGUS DURING A DROP LANDING BY COMPARISONS TO DATA FROM THREE-DIMENSIONAL ANALYSIS
    YOSHINORI KAGAYA, WATARU KAWASAKI, YASUNARI FUJII, HIDETSUGU NISHIZONO
    2010 Volume 59 Issue 4 Pages 407-414
    Published: 2010
    Released on J-STAGE: September 15, 2010
    DOIhttps://doi.org/10.7600/jspfsm.59.407
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Dynamic knee valgus is considered a risk factor of non-contact anterior cruciate ligament (ACL) injury. To identify athletes at a higher risk, we developed a two-dimensional (2D) video-based screening test that determines hip abductor function as well as dynamic hindfoot and knee valgus. The purpose of this study was to validate the accuracy of the indices for dynamic knee valgus derived knee-in distance (KID) and hip-out distance (HOD) from the 2D-video.
    Twenty healthy university students agreed to participate in this study. Subjects were asked to step off a 30-cm box and land on one leg. This procedure was recorded simultaneously using a 2D video camera in the frontal plane and the Vicon motion capture system. Pearson's correlations examined associations between KID, KID normalized by height (KID/H), HOD, as well as HOD normalized by height (HOD/H) and 3D-valgus (knee valgus) or 3D-IR (tibial internal rotation).
    Significant correlations were found between the KID and 3D-valgus (r=0.72, p<0.01) and KID/H and 3D-valgus (r=0.73, p<0.01). Associations were not significant between KID and 3D-IR (r=0.08) and between KID/H and 3D-IR (r=0.03). A positive moderate correlation between HOD and 3D-valgus (r=0.46, p<0.05) and HOD/H and 3D-valgus (r=0.50, p<0.05), as well as a negative moderate correlations between HOD and 3D-IR (r=-0.52, p<0.05) and between HOD/H and 3D-IR (r=-0.51, p<0.05) were also observed.
    We conclude that KID is a reliable alternative for the 3D-valgus and the HOD is for the 3D-valgus and tibial external rotation.
    View full abstract
    Download PDF (474K)
  • FALL-RELATED FACTORS TO TARGET IN COMMUNITY-BASED INTERVENTIONS FOR PREVENTION OF FALLS
    SATOSHI SEINO, NORIKO YABUSHITA, MI-JI KIM, TOMOAKI MATSUO, SONGEE JUN ...
    2010 Volume 59 Issue 4 Pages 415-426
    Published: 2010
    Released on J-STAGE: September 15, 2010
    DOIhttps://doi.org/10.7600/jspfsm.59.415
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Fall-related factors (FRFs) are classified into intrinsic factors and extrinsic factors. Intervention programs, which focused on modifiable factors (MFs) among FRFs have been designed to prevent falls. The purpose of this study was to identify easily-measurable intrinsic MFs for falls and recurrent falls. Cross-sectional analysis was carried out on the data from 483 community-dwelling older adults, aged 65-92 years (73.7 ± 5.9 yr, 138 men, 345 women). We measured history of falls in the past year and 7 domains of FRFs. Of these, 20 items were selected as MFs. Analyses of FRFs and MFs were conducted by comparing (separated by sex) those who did not report a fall with those who reported any number of falls, and those who reported no falls or one fall with those who reported recurrent falls. Using the significant items as independent variables, multiple logistic regression analysis with forward selection method was performed. The prevalence of falls and recurrent falls was: in men, 24.6% and 14.5%; in women, 26.7% and 12.5%. There were no significant differences in prevalence of falls or recurrent falls between genders. The following items were selected as the MFs most strongly associated with falls: climbing 10 steps with difficulty and tandem walk; and associated with recurrent falls: climbing 10 steps with difficulty, sit and reach, and tandem walk. These results are useful in determining the focus of fall prevention programs to be used in future community-based interventions.
    View full abstract
    Download PDF (417K)
  • RELATIONSHIP BETWEEN CHANGES OF SWIMMING VELOCITY, STROKE RATE, STROKE LENGTH AND MUSCLE ACTIVITIES IN FRONT CRAWL SWIMMING
    YASUSHI IKUTA, YUJI MATSUDA, YOSUKE YAMADA, NORIYUKI KIDA, SHINGO ODA
    2010 Volume 59 Issue 4 Pages 427-438
    Published: 2010
    Released on J-STAGE: September 15, 2010
    DOIhttps://doi.org/10.7600/jspfsm.59.427
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    The aim of this study was to investigate the relationship between changes in swimming velocity (SV), stroke rate (SR), stroke length (SL) and muscle activities during a 4×50m swimming test to simulate a 200m freestyle race. A total of 20 male collegiate swimmers participated in this study. The electromyography (EMG) signals of 11 muscles, 7 muscles in the upper half of the body and 4 muscles in the lower half, were recorded with surface electrodes. SV, SR and SL were analyzed for each 50m (S1, S2, S3 and S4) from side view recordings of swimmers taken with an underwater camera.
    SV and SR for S1 were significantly higher than for S2 and S3. SL for S1 was significantly longer than for S3. The averaged EMGs (aEMGs) for S1 were significantly higher than for S2 or for S3 in 5 muscles (flexor carpi ulnaris, biceps brachii, triceps brachii, deltoideus posterior and rectus femoris). There were no significant changes between S3 and S4 in SV, SR, SL and aEMG of all muscles except pectoralis major which showed the highest aEMG in S4. Significant correlations were observed between changes of (Δ) aEMG and ΔSV, especially in upper half muscles (r=0.485-0.939, p<0.05).
    These results suggested that decline in muscle activities of the five muscles mentioned earlier caused a decrease in SV from S1 to S3; and an increase in muscle activity of the pectoralis major led preventing a decline in SV by maintaining the SR in S4.
    View full abstract
    Download PDF (387K)
    • |<
    • <
    • 1
    • >
    • >|
feedback
 Top