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Fukuoka-shi, Japan

Matsubara T.,Fukuoka Health Promotion Center
[Nippon kōshū eisei zasshi] Japanese journal of public health | Year: 2011

The purpose of this study was to determine sub-maximal aerobic capacity levels evaluated by metabolic equivalents (unit is METs) at the double product break point (DPBP) and elucidate the safe and effective average exercise intensity among Japanese adults. A total of 438 subjects (123 males and 315 females) who participated in the exercise prescription course with measurement of the DPBP during a continuous incremental exercise test with a bicycle ergometer were enrolled in this study. The DP (heart rate-systolic blood pressure product) featured rapid increase with increasing exercise load during the continuous incremental exercise test. The metabolic equivalents at the DPBP level for males and females were 5.3+/-0.9 METs and 4.9+/-0.7 METs, respectively. Interestingly, the metabolic equivalent at the DPBP level in 87.2% of the study subjects was less than 6 METs. This study indicated that some physical activities above moderate intensity, such as the stair climbing (8 METs), might be inappropriate as health promotion exercises. Thus, the upper limit of exercise intensity for health promotion was 6 METs, especially if the subject was at cardiovascular risk. In addition, it was found necessary to make synthetic judgments in consideration of heart rate and rating of perceived exertion (RPE) during exercise. Source


Matsubara T.,Fukuoka Health Promotion Center | Matsubara T.,Physical Sciences, Inc | Maeda T.,Physical Sciences, Inc | Higuchi Y.,Physical Sciences, Inc | And 10 more authors.
Japanese Journal of Physical Fitness and Sports Medicine | Year: 2012

Previously, we have reported that age-predicted heart rate at 50%VO 2max (HR@50%VO 2max) is an effective index of adjusting appropriate exercise intensity for health promotion exercise. Thus, the aim of this study is to elucidate the change in HR at double product break point (HR@DPBP) and the validity of HR@50%VO 2max due to improvement of cardiovascular fitness. Ninety two healthy adults (57 +/- 9 years old), who participated in the health exercise training course, were studied. Participants were instructed how to control the intensity of physical activity for DPBP during their daily life. DPBP was determined with the use of incremental exercise test, and METs at DPBP (METs@DPBP), HR@DPBP, ratings of perceived exertion at DPBP (RPE@DPBP) were measured before and after the course. HR@50%VO 2max was calculated with the following formula; 138 - age/2 (bpm). METs@ DPBP significantly increased (p<0.001) after 10 weeks of the course, whereas HR@DPBP did not change. Interestingly, however, there was a significantly positive correlation (p<<0.001) between amount of change in METs@DPBP and that in HR@DPBP (AHR@DPBP). Multiple linear regression analysis indicated this correlation was independent from sex, age and amount of change in HR at rest (p<0.001). Before and after the course, proportion of study subjects' %△HRs ((HR@50%VO 2max - HR@DPBP) / HR@DPBP x 100) within -10% ~ +10% were both 48.9%, and proportion of study subjects' RPEs@DPBP within 11-13 were 92% and 85%, respectively. In this study, it was identified that significantly positive relation between amount of change in cardiovascular fitness and that of AHR@DPBP. This finding was independent from potentially affecting factors. In conclusion, this longitudinal study could suggest that HR@50%VO 2max and RPE were valuable indexes of determining exercise intensity for health promotion exercise. Source


Yanagawa M.,Fukuoka Health Promotion Center | Yanagawa M.,Physical Sciences, Inc | Higuchi Y.,Fukuoka Health Promotion Center | Higuchi Y.,Physical Sciences, Inc | And 8 more authors.
Japanese Journal of Physical Fitness and Sports Medicine | Year: 2014

Evidence suggests that sports activity can induce site-specific changes in bone mineral content (BMC) in athletes. Therefore, the first purpose of this study was to create a standard value for BMC (SVBMC) that is independent of body size and physical exercise effect. The second purpose was to examine usefulness for the SVBMC. In creating the SVBMC, we recruited noncustomer subjects who engaged in regular exercise but did not have site-specific changes to their bony structure. We studied 285 females (34.0±6.5 years) that were currently active, free from hormone treatment, and were not taking medication for any condition. Furthermore, all female subjects reported having a normal menstrual cycle. Bone area (BA), BMC and areal bone mineral density (aBMD) were measured by dual-energy X-ray absorption. Measurements of almost the complete skeleton, with the exception of the head, were taken (herein referred to as subtotal). This included scans of the entire spinal column, all 12 ribs, pelvis, full legs and arms. An allometry formula that relates BMC and BA was applied to determine the SVBMC. To exclude the effect of body size, calculations were determined using the perpendicular distance from the data of each individual to that determined by allometry regression. Finally, the mean and standard deviation of the distance were converted into T-scores. In examination of reliability for the SVBMC, we calculated the SVBMC for three customer females who engaged in regular exercise. We found a significantly positive relationship between SVBMC and weight/BMI. This correlation was weaker than the relationship between SVBMC and BMC, as expected, or the relationship between SVBMC and aBMD, with the exception of SVBMC in the pelvis. In conclusion, this study suggests that SVBMC is less affected by body size than by BMC or aBMD and the SVBMC was provided highly useful in case study. Source


Matsubara T.,Fukuoka Health Promotion Center | Matsubara T.,Physical Sciences, Inc | Koike G.,Fukuoka Health Promotion Center | Koike G.,Kyushu University | And 10 more authors.
Japanese Journal of Physical Fitness and Sports Medicine | Year: 2011

The aim of this study is to elucidate the relationship between the predicted 50%V̇O2max/wt (ml/kg/min) and coronary risk factors (CRFs). Seven hundred eighty six men (37.3 +/- 13.5 years old) and 1,268 women (41.5 +/- 13.6 years old) were studied. The predicted 50%V̇O 2max/wt was calculated by utilizing data from the continuous incremental exercise test with a stationary bicycle ergometer and the age-predicted heart rate at 50%V̇O2max (=138-age/2). As CRFs, percent body fat, systolic blood pressure, diastolic blood pressure, total cholesterol, triglyceride, high density lipoprotein cholesterol, fasting blood sugar and HbA1c were measured. The age-adjusted odds ratio of having abnormal values in CRFs across quartiles of the predicted 50%V̇O2max/wt (highest to lowest) were 1.00 (reference), 1.39, 2.64, and 6.78 in men, and 1.00, 1.73, 2.33 and 3.44 in women (for trend, p<0.001), respectively. This study indicated that the lower 50%V̇O2max/wt resulted in the higher odds ratio of having abnormal values in CRFs among Japanese. It was also confirmed that the sub-maximal aerobic capacity was associated with CRFs. Source


Matsubara T.,Fukuoka Health Promotion Center | Matsubara T.,Joint Stock Company | Yanagawa M.,Fukuoka Health Promotion Center | Yanagawa M.,Joint Stock Company | And 8 more authors.
Japanese Journal of Physical Fitness and Sports Medicine | Year: 2010

In this study, we examined a reliability of age-predicted heart rate (HR) for the 50%V̇O2max which is widely used during a training program for health promotion as compared to HR at the double product break point (DPBP). Two hundred fifty six non-hypertensive subjects (NHT), and 49 hypertensive ones under medication (HT) were studied. HT subjects were divided into two subgroups based on antihypertensive medications, ones with HR non-suppression agents (HT+HRNS) and the other with HR suppression agents (HT+HRS). DPBP was measured with the use of an incremental exercise test, and HR at DPBP (HR@DPBP) was determined. Age-predicted HR for the 50%V̇O 2max intensity of exercise was calculated with the following formula; HR=138-age/2. Measurable rate of DPBP and HR@DPBP in NHT, HT+HRNS and HT + HRS were 93.8% and 120±14bpm, 92.7% and 104±12bpm, 78.5% and 94±16bpm, respectively. There were significant differences in HR@DPBP and age-predicted HR in NHT and HT+HRS (p<0.01 in both groups). But %ΔHR ((age-predicted HR-HR@DPBP)/HR@DPBP x 100) within -10%∼ + 10% in NHT, HT + HRNS and HT + HRS were 68%, 58% and 14%, respectively. This might be due to HR at rest with sitting position that was significantly correlated to %ΔHR in all groups (r=-0.604,p<0.001 in NHT, r=-0.689,p<0.001 in HT+ HRNS and r=-0.761,p<0.05 in HT + HRS, respectively). And the range of HR at rest with sitting position corresponding to -10%∼+10% of %ΔHR were 70-95bpm in NHT, 71-93bpm in HT+HRNS and 83-102bpm in HT + HRS. In addition, this study indicated that DPBP could be measured even under antihypertensive medication that might affect DPBP measurement. In conclusion, we demonstrated that HR at DPBP and age-predicted HR were similar among 58-68% of NHT and HT+HRNS. And the range of HR at rest with sitting position to ensure reliability of age-predicted HR was elucidated. Source

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