The Growth and Development, Physical Fitness and Blood Constituents for Young Baseball Players
【Supercategory：7. DESCENTE SPORTS SCIENCE Subcategory：7.6 Vol.6】
The present study was designed to investigate the effects of physical training with baseball on a growth and development, physical fitness and blood constituents of boys of elementary school in city "A" in suburban area.
This study was consisted of three parts (A, B and C).
A Maximal oxygen uptake (VO₂max) and maximal heart rate (max HR) of 11 baseball players (YB) were examined by treadmill exercise. Blood and urine samples were collected, blood pressure was measured before and after exhaustive exercise.
Ten control boys (C), not belonged to baseball club, also received same examinations. These healthy volunteers aged from 9 to 12 years old. The following results were obtained.
(1) Mean VO₂max and maxHR were 48.7±6.3 and 200.3±6.7 in YB, 50.9±3.4m/kg/min and 204.0±5.3 beats/min in C, respectively. But, no statistical differences were shown between YB and C group.
(2) Blood lactate (LA), blood sugar (BS) and other blood constituents elevated after exercise. Urine volume, metabolites, and electrolytes excretions in urine decreased immediately after run. No significant differences were observed between YB and C group.
B Physiological loads of the above 11 boys during 3-day baseball camp training were studied from the standpoints of changes in body weight, muscular strength; blood pressure, and other measurements.
The results were as follows:
(1) Body weight decreased, and blood pressure and body temperature elevated after one day training. But, no changes of these measurements at rest before one day training were observed throughout the 3 day-camp training.
(2) Grip strength at rest decreased gradually, but back strength did not change throughout the camp training.
(3) Urine volume at rest day before the camp training was 758±380, and decreased 631±110ml/day at second day. Sodium and chloride excretions in urine also decreased significantly. But, urine volume and electrolytes excretions recovered at third day.
(4) Mean heart rate during baseball training was 110±15 beats/min, and the highest HR was 165 beats/min. Mean exercise intensity during baseball camp training estimated about 45% VO₂max. Based on these parameters, it is suggested that the physiological loads of this camp training were not severe.
C The questionnaires on the motivation to belong to baseball club, frequency of baseball training, training time a day, and on the change of attitude in their daily life were examined in 142 baseball club members who go to elementary schools in A city.
The following results were obtained.
(1) The major motivation to be a member of baseball club was a reason why they love a baseball (48.6%).
(2) The frequency of training was once a week (81.0%), and exercise time was 6 hours a day.
(3) Almost all boys (71.8%) belonged to the school sports club except baseball, and exercised about an hour a day from once to six times a week (62.7%). This result suggested that the above control boys might exercise except baseball.
(4) Almost all boys became to be an obedient child (71.8%), to keep a regular attitude against their friends (57.0%), and had many friends (87.3%).
It is concluded that the elementary school boys, not only baseball players but also non-baseball players, in city "A" have a good health, excellent physical fitness, and their VO₂max were higher than that of Japanese boys with the same age, and becoming a member of baseball club brings a good effects to children's attitude in daily life.
DESCENTE SPORTS SCIENCE Vol.6/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE
This study was consisted of three parts (A, B and C).
A Maximal oxygen uptake (VO₂max) and maximal heart rate (max HR) of 11 baseball players (YB) were examined by treadmill exercise. Blood and urine samples were collected, blood pressure was measured before and after exhaustive exercise.
Ten control boys (C), not belonged to baseball club, also received same examinations. These healthy volunteers aged from 9 to 12 years old. The following results were obtained.
(1) Mean VO₂max and maxHR were 48.7±6.3 and 200.3±6.7 in YB, 50.9±3.4m/kg/min and 204.0±5.3 beats/min in C, respectively. But, no statistical differences were shown between YB and C group.
(2) Blood lactate (LA), blood sugar (BS) and other blood constituents elevated after exercise. Urine volume, metabolites, and electrolytes excretions in urine decreased immediately after run. No significant differences were observed between YB and C group.
B Physiological loads of the above 11 boys during 3-day baseball camp training were studied from the standpoints of changes in body weight, muscular strength; blood pressure, and other measurements.
The results were as follows:
(1) Body weight decreased, and blood pressure and body temperature elevated after one day training. But, no changes of these measurements at rest before one day training were observed throughout the 3 day-camp training.
(2) Grip strength at rest decreased gradually, but back strength did not change throughout the camp training.
(3) Urine volume at rest day before the camp training was 758±380, and decreased 631±110ml/day at second day. Sodium and chloride excretions in urine also decreased significantly. But, urine volume and electrolytes excretions recovered at third day.
(4) Mean heart rate during baseball training was 110±15 beats/min, and the highest HR was 165 beats/min. Mean exercise intensity during baseball camp training estimated about 45% VO₂max. Based on these parameters, it is suggested that the physiological loads of this camp training were not severe.
C The questionnaires on the motivation to belong to baseball club, frequency of baseball training, training time a day, and on the change of attitude in their daily life were examined in 142 baseball club members who go to elementary schools in A city.
The following results were obtained.
(1) The major motivation to be a member of baseball club was a reason why they love a baseball (48.6%).
(2) The frequency of training was once a week (81.0%), and exercise time was 6 hours a day.
(3) Almost all boys (71.8%) belonged to the school sports club except baseball, and exercised about an hour a day from once to six times a week (62.7%). This result suggested that the above control boys might exercise except baseball.
(4) Almost all boys became to be an obedient child (71.8%), to keep a regular attitude against their friends (57.0%), and had many friends (87.3%).
It is concluded that the elementary school boys, not only baseball players but also non-baseball players, in city "A" have a good health, excellent physical fitness, and their VO₂max were higher than that of Japanese boys with the same age, and becoming a member of baseball club brings a good effects to children's attitude in daily life.
DESCENTE SPORTS SCIENCE Vol.6/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE
| Researcher | Shigeru Matsubara*1, Tetsuya Taru*2, Kuniko Isono*3, Mono Katoh*4, Hisashi Nakamura*5, Keishi Iwamoto*1, Masato Suzuki*6, Masatoshi Shiota*6, Yoshiko Iijima*6, Sachio Ikawa*6 |
|---|---|
| University or institution | *1 College of Science and Technology, The Nihon University, *2 Higashi-Katsushika Office of Chiba Prefecture Education Bureau, *3 Young Boys' Baseball League, Silver Phenix, Abiko City, *4 Young Boys' Baseball League, Transum, in Abiko City, *5 The Young Boy's Baseball Club in Abiko City, *6 Department of Laboratory Medicine, The Jikei University School of Medicine |
Keywords
physical training, growth and development, physical fitness, blood constituents, elementary school