著者

Taichi Yamaguchi Kojiro Ishii

出版者

The Japanese Society of Physical Fitness and Sports Medicine

雑誌

The Journal of Physical Fitness and Sports Medicine (ISSN:21868131)

巻号頁・発行日

vol.3, no.1, pp.121-129, 2014-03-25 (Released:2014-03-20)

参考文献数

62

被引用文献数

13 20

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Previous studies have indicated that dynamic stretching acutely improves explosive performance, and dynamic stretching is now incorporated into warm-up protocols prior to sports activities that require explosive performance. The optimal protocol for dynamic stretching, however, has not been clarified. The purpose of this review is to clarify the optimal protocols for velocity and volume (i.e., repetition or distance x set) in dynamic stretching to improve explosive performance by systematic investigation. For velocity, the rate of change in explosive performance when dynamic stretching was performed “as fast as possible” (7.6 ± 3.8%) was significantly (P < 0.01) greater compared to when dynamic stretching was performed “without setting the velocity” (1.1 ± 5.3%). This finding suggested that dynamic stretching should be performed “as fast as possible”. As for volume, the repetition of dynamic stretching was significantly (P < 0.01) negatively correlated with the rate of change in explosive performance only when dynamic stretching was performed without setting the velocity. The distance of dynamic stretching was also significantly (P < 0.05) negatively correlated with the rate of change in explosive performance. These findings suggest that explosive performance might become impaired as the volume of dynamic stretching increases. By combining simple regression analysis of the repetition or the distance of dynamic stretching and the rate of change in explosive performance with a systematic investigation, it was found that the optimal “repetition” or “distance” x “set” of dynamic stretching was “10-15 repetitions” or “10 yards-20 meters” x “1-2 sets”, respectively.

著者

Tomohiro Oba Hiroaki Iwase Yoshitake Oshima Junya Miyazaki Kojiro Ishii

出版者

The Japanese Association of Rehabilitation Medicine

雑誌

Progress in Rehabilitation Medicine (ISSN:24321354)

巻号頁・発行日

vol.2, pp.20170016, 2017 (Released:2017-12-27)

参考文献数

26

被引用文献数

1 1

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Objective: This study investigated the optimum conditions for obtaining valid step-count measurements for patients with abnormal gait. Methods: Subjects comprised 61 hospitalized patients with abnormal gait. Four different devices were tested: Active Style Pro (AS), Walking Style (WS), Lifecorder PLUS, and Steps. The same device type was attached to the waist on both the affected and the unaffected side. Patients then walked 25 m at a comfortable speed. This test was repeated four times, once for each device. The measurement error (ME) and walking parameters (gait velocity, step length, and cadence) were calculated from the test data. ME scores smaller than 3% and 10% were classified as valid: scores above these standards were classified as invalid. Walking parameter values that identified the invalid group with a specificity of 0.95 were set as the cut-off velocity (COV), the cut-off step length (COS), and the cut-off cadence. Sensitivity values >0.40 and positive predictive values >80% were then set as necessary conditions. Results: COV values were 0.90 m/s (AS on the unaffected side at 3% ME and AS on the affected side or the unaffected side at 10% ME), 0.92 m/s (WS on the unaffected side at 10% ME), and 0.98 m/s (WS on the affected side at 3% ME). COS values were 0.50 m (AS on the affected side at 10% ME) and 0.52 m (AS on the unaffected side at 3% ME). Conclusion: The most accurate measurements were obtained using AS attached to the unaffected side with a gait velocity of >0.90 m/s.

著者

Shota SASAKI Satoshi NAKAE Naoyuki EBINE Wataru AOI Akane HIGASHI Kojiro ISHII

出版者

Center for Academic Publications Japan

雑誌

Journal of Nutritional Science and Vitaminology (ISSN:03014800)

巻号頁・発行日

vol.60, no.1, pp.28-34, 2014 (Released:2014-04-24)

参考文献数

29

被引用文献数

2 4

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Although the intake of carbohydrates is important for the supplementation of energy substrate utilized during exercise, fat oxidation is possibly prevented by an elevation of insulin, and whether or not the timing of the intake of meals affects energy metabolism during exercise has not been clarified. The purpose of this study was to investigate the effect of the timing of the intake of meals taken at different times before exercise on the carbohydrate and fat metabolism during aerobic exercise. The subjects were eight young trained athletes who performed cycling exercise at the lactate threshold (LT) intensity for 60 min. They performed under five conditions consisting of a no-meal (water) trial, and four meal trials that had a normal meal at 1, 2, 3, and 4 h before the exercise. There were no significant changes for any trial in respiratory exchange ratio, or carbohydrate or fat oxidation rates during exercise. The serum insulin level before exercise in the meal trials was more elevated, the shorter the time to the start of the exercise from meal intake. A tendency for higher blood glucose was shown during exercise with a shorter interval time in the meal trials. No alterations were demonstrated for the serum free fatty acids in any of the groups. These results showed that the timing of the pre-exercise meal taken within a 4-h period before exercise did not affect the energy metabolism of the trained subjects during exercise at LT intensity.