Japanese Journal of Physical Fitness and Sports Medicine
Online ISSN : 1881-4751
Print ISSN : 0039-906X
ISSN-L : 0039-906X
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Volume 43, Issue 3
Displaying 1-5 of 5 articles from this issue
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  • RELATIONSHIPS BETWEEN LONG-LATENCY REFLEX COMPONENTS IN WRIST FLEXOR AND PREMOTOR TIME WITH REACTION MOVEMENT DURING WRIST FLEXION
    TOMOHIRO KIZUKA, TAKAAKI ASAMI, KATSUNORI TANII
    1994 Volume 43 Issue 3 Pages 201-210
    Published: June 01, 1994
    Released on J-STAGE: September 30, 2010
    DOIhttps://doi.org/10.7600/jspfsm1949.43.201
    JOURNAL FREE ACCESS
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    A study was undertaken to investigate whether the amplitudes of reflex EMG components (M1, M2 and M3) induced by sudden muscle stretching in the wrist flexor, are modified according to the reaction movement during wrist flexion, and how the aspects of reflex EMG components are related to premotor time under conditions of stretch stimulus (SS-PMT) and light stimulus (LS-PMT) . Fifteen healthy men, ranging in age from 22 to 28yr, participated in the study. A DC torque motor was used to evoke the reflex EMG activities on the wrist flexor. Analysis of the surface electromyogram recorded from the wrist flexor showed that short and long latency reflex components appeared in response to muscle stretch. In almost subjects, the amplitude of the M2 component was higher during reaction task than during no reaction task. The subjects were classified into two groups (I, II) according to the presence or absence of reflex components and their EMG amplitudes. SS- and LS-PMTs in group I were significantly shorter than those in group II. The amplitude of M2 in group I was significantly higher than in group II. In group I the M3 component was not identified, since the M2 component was followed by a voluntary EMG burst.
    These results showed that the amplitudes of long latency reflex components increased during the reaction task in the flexion direction, and suggest that long latency components contribute to the initiation of voluntary movement in subjects with a shorter premotor time.
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  • EVALUATION ON THE EFFECT OF LOW INTENSITY EXERCISE TRAINING IN CORONARY ARTERY DISEASE
    -INCLUDING THE EVALUATION ON SIGNIFICANCE OF EXERCISE TRAINING AFTER CABG SURGERY-
    MASAHIKO AIHARA, KAZUO TSUYUKI, MAKOTO AKAIKE, KENJI NINOMIYA, KWANGCH ...
    1994 Volume 43 Issue 3 Pages 211-218
    Published: June 01, 1994
    Released on J-STAGE: September 30, 2010
    DOIhttps://doi.org/10.7600/jspfsm1949.43.211
    JOURNAL FREE ACCESS
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    A study was conducted to evaluate the effects of exercise training for cardiac rehabilitation. 69 patients with coronary artery disease were assigned to a low intensity exercise training program, which lasted for 3 months. The target heart rate for the exercise program was set at 50-60% of maximal heart rate. For comparison, the study patients were divided into 2 groups. 25 patients who had undergone CABG were assigned to group A and 42 patients who had not undergone CABG were assigned to group B. A symptom-limited treadmill exercise test was performed before and after the exercise training program in each patient. Oxygen uptake (VO2), SBP, HR and PRP were measured at rest, submaximal workload and workload at the end point during the treadmill exercise test.
    In addition, FAT, LVI and PCI were calculated. The parameters measured before and after exercise training were compared in order to assess the effects of the exercise training program. Our findings showed that exercise training was effective for improving exercise tolerance and submaximal exercise capacity in patients with coronary artery disease, particularly those who had undergone CABG.
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  • LOWER EXTREMITY FUNCTION FOR SHOCK ATTENUATION DURING LANDING ON ONE LEG
    AKIRA MAEDA, HIROSHI EBASHI, HIDETSUGU NISHIZONO, HIDETARO SHIBAYAMA
    1994 Volume 43 Issue 3 Pages 219-227
    Published: June 01, 1994
    Released on J-STAGE: September 30, 2010
    DOIhttps://doi.org/10.7600/jspfsm1949.43.219
    JOURNAL FREE ACCESS
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    A study was conducted to investigate the cushioning effects of lower extremity functions on shock attenuation during landing on one leg.
    Optical methods were used to investigate the cushioning effects of lower extremity functions, since these facilitated the quantitation of kinematic variables such as angle, change in angle, position, displacement and velocity during the landing. The subjects were 5 healthy students ranging in age from 21 to 24 years. Ground reaction force (GRF) was measured with a force platform. The impact force peaks showed vertical force-time averages for 1 subject landing on one leg or two legs for 10 trials each from a height of 10cm.
    The peak/body weight of impact force of GRF upon landing was attenuated by the cushioning effects of the lower extremity functions, i. e. bending of the knee and ankle joints, more effectively on two legs than on one.
    Supination and pronation of the ankle joint influenced the impact force peaks, and the results of this experiment demonstrated significant difference between the number of discharge bursts of leg muscles upon landing on one leg and those landing on two, the former being higher.
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  • [title in Japanese]
    1994 Volume 43 Issue 3 Pages 228-237
    Published: June 01, 1994
    Released on J-STAGE: September 30, 2010
    DOIhttps://doi.org/10.7600/jspfsm1949.43.228
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1994 Volume 43 Issue 3 Pages 238-239
    Published: June 01, 1994
    Released on J-STAGE: September 30, 2010
    DOIhttps://doi.org/10.7600/jspfsm1949.43.238
    JOURNAL FREE ACCESS
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