Teru Kumagi

Toronto Western Hospital, Toronto, Ontario, Canada

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Publications (112)481.16 Total impact

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    ABSTRACT: Bile duct injury is a potential complication of radiofrequency ablation (RFA). Bipolar RFA devices have recently become available. Because visibility of the bipolar RFA electrodes is not good on ultrasonography, more careful usage of the electrodes to avoid bile ducts is needed. We present a case with hepatocellular carcinoma (HCC) located near the B5 intrahepatic bile duct. To view the bile duct, we used contrast medium for ultrasonography, administered through a biliary drainage catheter for endoscopic nasobiliary drainage (ENBD). Infusing the contrast medium allowed clear visualization of the HCC adjacent to the major bile duct during RFA. We also used a navigation system for bipolar RFA to confirm positions of the electrodes and HCC. We confirmed complete ablation of the HCC while avoiding bile duct injury and late bile duct stenosis. Administration of contrast medium for ultrasonography through an ENBD tube appears useful to avoid bile duct injury during RFA.
    Clinical Journal of Gastroenterology 08/2015; DOI:10.1007/s12328-015-0599-2
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    ABSTRACT: Approaches to risk stratification for patients with primary biliary cirrhosis (PBC) are limited, single-center based, and often dichotomous. We aimed to develop and validate a better model for determining prognoses of patients with PBC. We performed an international, multicenter meta-analysis of 4119 patients with PBC treated with ursodeoxycholic acid (UDCA) at liver centers in 8 European and North American countries. Patients were randomly assigned to derivation (n=2488, 60%) and validation cohorts (n=1631, 40%). A risk score (GLOBE score) to predict transplantation-free survival was developed and validated with univariate and multivariable Cox regression analyses using clinical and biochemical variables obtained after 1 y UDCA therapy. Risk score outcomes were compared with the survival of age-, sex-, and calendar time-matched members of the general population. The prognostic ability of the GLOBE score was evaluated alongside those of the Barcelona, Paris-1, Rotterdam, Toronto, and Paris-2 criteria. Age (hazard ratio [HR], 1.05; 95% confidence interval [CI], 1.04-1.06; P<.0001); levels of bilirubin (HR, 2.56; 95% CI, 2.22-2.95; P<.0001), albumin (HR, 0.10; 95% CI, 0.05-0.24; P<.0001), and alkaline phosphatase (HR, 1.40; 95% CI, 1.18-1.67; P=.0002); and platelet count (HR/10 units decrease, 0.97; 95% CI, 0.96-0.99; P<.0001) were all independently associated with death or liver transplantation (C statistic derivation, 0.81; 95% CI, 0.79-0.83, and validation cohort, 0.82; 95% CI, 0.79-0.84). Patients with risk scores >0.30 had significantly shorter times of transplant-free survival than matched healthy individuals (P<.0001). The GLOBE score identified patients who would survive for 5 y and 10 y (responders) with positive predictive values of 98% and 88%, respectively. Up to 22% and 21% of events and non-events, respectively, 10 y after initiation of treatment were correctly reclassified in comparison with earlier proposed criteria. In subgroups of patients <45 y, 45-52 y, 52-58 y, 58-66 y, and ≥66 y old, age-specific GLOBE-score thresholds beyond which survival significantly deviated from matched healthy individuals were -0.52, 0.01, 0.60, 1.01 and 1.69, respectively. Transplant-free survival could still be accurately calculated by the GLOBE score with laboratory values collected at 2-5 y after treatment. We developed and validated scoring system (the GLOBE score) to predict transplant-free survival of UDCA-treated patients with PBC. This score might be used to select strategies for treatment and care. Copyright © 2015 AGA Institute. Published by Elsevier Inc. All rights reserved.
    Gastroenterology 08/2015; DOI:10.1053/j.gastro.2015.07.061 · 16.72 Impact Factor
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    ABSTRACT: Purpose. The purpose of this study was to establish the relationship between the grade of chronic pancreatitis (CP) and pancreatic blood flow as measured by contrast-enhanced transabdominal ultrasonography (CEUS) and to diagnose early CP easily. Methods. This pilot study was conducted in 8 patients with CP, 7 patients with early CP, and 6 control participants. After injecting 0.015 mL/kg of perflubutane by manual bolus, values in one region of interest (ROI) in pancreatic parenchyma and one ROI including the superior mesenteric artery (SMA) were measured. Results. The ratio of blood flow in the SMA and pancreatic parenchyma increased with grade of CP and was significantly higher in patients with CP (5.41; 2.10-11.02) than in patients with early CP (2.46; 1.41-5.05) and control participants (2.32; 1.25-3.04) , , resp.). The ratio of blood flow in the SMA and pancreatic parenchyma correlated with grade of CP , . Conclusion. The ratio of blood flow correlates with grade of CP on CEUS. This safe and convenient method may be useful to diagnose early CP.
    06/2015; 2015:1-5. DOI:10.1155/2015/393124
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    ABSTRACT: In Japan, the maldistribution of physicians between urban and rural areas is increasing. It is important to know the practice location expectations of future physicians. The study was designed as a cross-sectional survey. In 2009-2013, students at a medical school in Japan completed a questionnaire containing 50 items with four-point Likert scales. The students rated the importance of specified individual and occupational aspects. Furthermore, students were asked to state their intention to practice in a rural area. The study sample consisted of 368 students (88.2% response rate). Significant variables that were associated with a positively motivated intent for rural practice were 'presence of a role model' (odds ratio (OR), 5.42; 95% confidence interval (CI), 1.58-18.5), 'admission by school recommendation' (OR, 7.68; 95%CI, 2.14-27.6), 'growing up in a rural area' (OR, 6.16; 95%CI, 1.01-37.6), 'general medicine/family medicine as the first career choice' (OR, 5.88; 95%CI, 2.43-14.2), 'interest in the targeted population' (OR, 16.7; 95%CI, 3.97-69.9), 'memorable experience at a class or clinical rotation' (OR, 3.94; 95%CI, 3.73-416), and 'location of their medical school' (OR, 11.4; 95%CI, 2.79-46.2). The present study suggests that medical schools might recruit students with characteristics associated with intention for rural practice.
    Rural and remote health 04/2015; 15(2):3112. · 0.88 Impact Factor

  • Journal of Hepatology 04/2015; 62:S796-S797. DOI:10.1016/S0168-8278(15)31376-3 · 11.34 Impact Factor

  • Journal of Hepatology 04/2015; 62:S798-S799. DOI:10.1016/S0168-8278(15)31380-5 · 11.34 Impact Factor

  • Gastroenterology 04/2015; 148(4):S-908. DOI:10.1016/S0016-5085(15)33081-X · 16.72 Impact Factor
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    ABSTRACT: A 36-year-old Japanese woman took over-the-counter (OTC) medication for headaches for 20 days. Subsequently, five days after discontinuing the medication, a skin rash developed over the patient's upper and lower limbs and face, in addition to a fever, brown urine and serious liver dysfunction. Drug lymphocyte stimulation tests implicated ibuprofen, a main component of the OTC drugs, which has the potential to induce this pathology, and a diagnosis of drug-induced liver injury with multiform exudative erythema was made. The patient's symptoms and liver function tests returned to normal following treatment with systemic steroids.
    Internal Medicine 03/2015; 54(4):395-9. DOI:10.2169/internalmedicine.54.3204 · 0.90 Impact Factor
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    ABSTRACT: "Soft pancreas" has often been reported as a predictive factor for postoperative pancreatic fistula (POPF) after pancreatectomy. However, pancreatic stiffness is judged subjectively by surgeons, without objective criteria. In the present study, pancreatic stiffness was quantified using intraoperative ultrasound elastography, and its relevance to POPF and histopathology was investigated. Forty-one patients (pancreatoduodenectomy, 30; distal pancreatectomy, 11) who underwent intraoperative elastography during pancreatectomy were included. The elastic ratio was determined at the pancreatic resection site (just above the portal vein) and at the remnant pancreas (head or tail). Correlations between the incidence of POPF and patient characteristics, operative variables, and the elastic ratio were examined. In addition, the relationship between the elastic ratio and the percentage of the exocrine gland at the resection stump was investigated. For pancreatoduodenectomy patients, main pancreatic duct diameter < 3.2 mm and elastic ratio < 2.09 were significant risk factors for POPF. In addition, the elastic ratio, but not main pancreatic duct diameter, was significantly associated with the percentage of exocrine gland area at the pancreatic resection stump. Pancreatic stiffness can be quantified using intraoperative elastography. Elastography can be used to diagnose "soft pancreas" and may thus be useful in predicting the occurrence of POPF.
    International surgery 03/2015; 100(3):497-502. DOI:10.9738/INTSURG-D-14-00040.1 · 0.47 Impact Factor
  • Mitsuhito Koizumi · Teru Kumagi · Yoichi Hiasa ·

    Gastroenterology 02/2015; 148(4). DOI:10.1053/j.gastro.2014.10.057 · 16.72 Impact Factor

  • 01/2015; 38(3):214-220. DOI:10.14442/generalist.38.214
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    ABSTRACT: Purpose: This study aimed at prospectively evaluating bile duct anatomy on ultrasonography and evaluating the safety and utility of radiofrequency ablation (RFA) assisted by virtual ultrasonography from gadolinium ethoxybenzyl diethylenetriamine pentaacetic acid (Gd-EOB-DTPA)-enhanced magnetic resonance imaging (MRI). Methods: The institutional review board approved this study, and patients provided written informed consent prior to entry into the study. Bile duct anatomy was assessed in 201 patients who underwent Gd-EOB-DTPA-enhanced MRI for the evaluation of hepatic tumor. Eighty-one of these patients subsequently underwent RFA assisted by ultrasound imaging. In 23 patients, the tumor was located within 5 mm of the central bile duct, as demonstrated by MRI. Results: Virtual ultrasonography constructed by Gd-EOB-enhanced MRI was able to visualize the common bile duct, left hepatic duct, and right hepatic duct in 96.5, 94.0, and 89.6 % of cases, respectively. The target hepatic tumor nodule and biliary duct could be detected with virtual ultrasonography in all patients, and no severe complications occurred. Conclusion: The running pattern of the bile ducts could be recognized on conventional ultrasound by referencing virtual ultrasonography constructed by Gd-EOB-DTPA-enhanced MRI. RFA assisted by this imaging strategy did not result in bile duct injury.
    Journal of Medical Ultrasonics 12/2014; 42(2). DOI:10.1007/s10396-014-0598-9 · 0.62 Impact Factor
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    ABSTRACT: Chronic kidney disease (CKD) is a major public health problem. However, few studies have examined the significance of serum bilirubin as a risk factor for the development of CKD in the general Japanese population. The subjects comprised 413 men (mean age: 79±9 years; (range, 60-100 years) and 637 women (mean age: 81±8 years; range, 60-106 years) who visited the medical department of Seiyo Municipal Nomura Hospital. We examined the relationship between increased serum bilirubin and renal function that was evaluated by estimated glomerular filtration rate (eGFR) using CKD-EPI equations modified by a Japanese coefficient. Stepwise multiple regression analysis with eGFR as the objective variable, and adjusted risk factors as the explanatory variables, showed that serum bilirubin (β = 0.11, P<0.001) was significantly and independently associated with eGFR, in addition to gender, age, prevalence of antihypertensive medication, triglycerides, prevalence of antidiabetic medication, and serum uric acid. Compared with stages 1+2 (eGFR ≥60.0 ml/min/1.73 m2), mean multivariate-adjusted odds ratio {95% (confidence interval (CI)} for hypobilirubinemia (first quartile, <0.52 mg/dL) was 3.52 (range: 1.88-6.59). Next, to control potential confounding factors, data were further stratified by gender, age, medication (antihypertensive, antidyslipidemic, and antidiabetic agents), and prevalence of cardiovascular disease. The standardized coefficient for eGFR was significant in both groups, and there was no interaction between the groups. Our data demonstrated an independent positive association between serum bilirubin and eGFR in both genders. Low serum bilirubin level would be useful as a potential risk factor for renal function.
    PLoS ONE 12/2014; 9(12):e115294. DOI:10.1371/journal.pone.0115294 · 3.23 Impact Factor
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    ABSTRACT: Serum bilirubin may have a beneficial role in preventing oxidative changes in atherosclerosis. Limited information is available on whether serum total bilirubin is an independent confounding factor for carotid atherosclerosis {for example, intima-media thickness (IMT), plaque} measured noninvasively by B-mode ultrasonography only among elderly persons. The study subjects were 325 men aged 79±8 (mean ± standard deviation) years and 509 women aged 81±8 years that were enrolled consecutively from patients aged ≥60 years in the medical department. Carotid IMT and plaque were derived via B-mode ultrasonography. Multiple linear regression analysis showed that in men age (β = 0.199, p = 0.002), smoking status (β = 0.154, p = 0.006), GGT (β = -0.139, p = 0.039), and GGT (β = -0.133, p = 0.022) were significantly and independently associated with carotid IMT, and in women age (β = 0.186, p<0.001), systolic blood pressure (β = 0.104, p = 0.046), diastolic blood pressure (β = -0.148, p = 0.004), prevalence of antihypertensive medication (β = 0.126, p = 0.004), fasting plasma glucose (β = 0.135, p = 0.003), GGT (β = -0.104, p = 0.032), estimated glomerular filtration rate, serum bilirubin (β = -0.119, p = 0.006), and prevalence of cardiovascular disease (CVD) (β = 0.103, p = 0.017) were also independently associated with carotid IMT. The odds ratios (ORs) {95% confidence interval (CI)} of increasing serum bilirubin category were negatively associated with carotid IMT ≥1.0 mm and plaque in both genders. Compared to subjects with a serum bilirubin of Quartile-1, the multivariate-OR (95% CI) of carotid plaque was 0.25 (0.11-0.57) in the Quartile-4 male group, and 0.41 (0.21-0.78) in the Quartile-2 female group, 0.51 (0.26-0.98) in the Quartile-3 female group, and 0.46 (0.24-0.89) in the Quartile-4 female group. Our data demonstrated an independently negative association between serum bilirubin and carotid atherosclerosis in both genders.
    PLoS ONE 12/2014; 9(12):e114281. DOI:10.1371/journal.pone.0114281 · 3.23 Impact Factor
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    ABSTRACT: Background: Although impaired glucose tolerance is common in cirrhosis, this condition's pathogenesis remains undefined. This study aimed to clarify pathogenesis related to the pancreas in cirrhotic patients, and to evaluate associations between insulin secretion and pancreatic congestion due to portal hypertension. Methods: Pancreatic perfusion parameters were analyzed by dynamic contrast-enhanced ultrasound (CE-US) in 41 patients (20 cirrhotic, 21 non-cirrhotic; age, 67.9 ± 13.3; female, 19), and prospectively compared to delta C-peptide immunoreactivity (ΔCPR). In a separate study, a retrospective chart review with human autopsy specimens was conducted, and vessels and islets of the pancreas were analyzed in 43 patients (20 cirrhotic, 23 controls; age, 71.5 ± 11.6; female, 15). Results: In the CE-US study, the clinical characteristics indicative of portal hypertension (e.g., ascites and varices) had significantly higher incidences in the cirrhotic group than in the control group. Pancreatic drainage times were greater in the cirrhotic group (p < 0.0001), and had a significant negative correlation with ΔCPR (R = 0.42, p = 0.0069). In the histopathological study, the islets were enlarged in the cirrhotic group (p < 0.0001). However, the percentage of insulin-positive area per islet was decreased in the cirrhotic group (p < 0.0001), and had a significant negative correlation with the wall thickness of the pancreatic vein (R = 0.63, p < 0.0001). Conclusions: Pancreatic congestion was present in cirrhotic patients. Moreover, pancreatic congestion and insulin secretion were significantly correlated. This pathogenesis could be a key factor underlying the development of hepatogenous diabetes in cirrhotic patients.
    Journal of Gastroenterology 10/2014; 50(6). DOI:10.1007/s00535-014-1001-8 · 4.52 Impact Factor
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    ABSTRACT: Background It is not clear whether elevated uric acid is a risk factor for the onset of impaired fasting glucose after stratifying by baseline fasting plasma glucose levels. We conducted a community-based retrospective longitudinal cohort study to clarify the relationship between uric acid levels and the onset of impaired fasting glucose, according to baseline fasting plasma glucose levels. Methods We enrolled 6,403 persons (3,194 men and 3,209 women), each of whom was 18–80 years old and had >2 annual check-ups during 2003–2010. After excluding persons who had fasting plasma glucose levels ≥6.11 mM and/or were currently taking anti-diabetic agents, the remaining 5,924 subjects were classified into quartiles according to baseline fasting plasma glucose levels. The onset of impaired fasting glucose was defined as fasting plasma glucose ≥6.11 mM during the observation period. Results In the quartile groups, 0.9%, 2.1%, 3.4%, and 20.2% of the men developed impaired fasting glucose, respectively, and 0.1%, 0.3%, 0.5%, and 5.6% of the women developed impaired fasting glucose, respectively (P trend <0.001). After adjusting for age, body mass index, systolic blood pressure, triacylglycerols, high density lipoprotein-cholesterol, creatinine, fatty liver, family history of diabetes, alcohol consumption, and current smoking, uric acid levels were positively associated with onset of impaired fasting glucose in men with highest-quartile fasting plasma glucose levels (adjusted hazard ratio, 1.003; 95% confidence interval, 1.0001–1.005, P = 0.041). Conclusions Among men with high fasting plasma glucose, hyperuricemia may be independently associated with an elevated risk of developing impaired fasting glucose.
    PLoS ONE 09/2014; 9(9):e107882. DOI:10.1371/journal.pone.0107882 · 3.23 Impact Factor
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    ABSTRACT: Background & aims: Noninvasive surrogate end points of long-term outcomes of patients with primary biliary cirrhosis (PBC) are needed to monitor disease progression and evaluate potential treatments. We performed a meta-analysis of individual patient data from cohort studies to evaluate whether patients' levels of alkaline phosphatase and bilirubin correlate with their outcomes and can be used as surrogate end points. Methods: We performed a meta-analysis of data from 4845 patients included in 15 North American and European long-term follow-up cohort studies. Levels of alkaline phosphatase and bilirubin were analyzed in different settings and subpopulations at different time points relative to the clinical end point (liver transplantation or death). Results: Of the 4845 patients, 1118 reached a clinical end point. The median follow-up period was 7.3 years; 77% survived for 10 years after study enrollment. Levels of alkaline phosphatase and bilirubin measured at study enrollment (baseline) and each year for 5 years were strongly associated with clinical outcomes (lower levels were associated with longer transplant-free survival). At 1 year after study enrollment, levels of alkaline phosphatase that were 2.0 times the upper limit of normal (ULN) best predicted patient outcome (C statistic, 0.71) but not significantly better than other thresholds. Of patients with alkaline phosphatase levels ≤ 2.0 times the ULN, 84% survived for 10 years compared with 62% of those with levels >2.0 times the ULN (P < .0001). Absolute levels of alkaline phosphatase 1 year after study enrollment predicted patient outcomes better than percentage change in level. One year after study enrollment, a bilirubin level 1.0 times the ULN best predicted patient transplant-free survival (C statistic, 0.79). Of patients with bilirubin levels ≤ 1.0 times the ULN, 86% survived for 10 years after study enrollment compared with 41% of those with levels >1.0 times the ULN (P < .0001). Combining levels of alkaline phosphatase and bilirubin increased the ability to predict patient survival times. We confirmed the predictive value of alkaline phosphatase and bilirubin levels in multiple subgroups, such as patients who had not received treatment with ursodeoxycholic acid, and at different time points after study enrollment. Conclusions: Levels of alkaline phosphatase and bilirubin can predict outcomes (liver transplantation or death) of patients with PBC and might be used as surrogate end points in therapy trials.
    Gastroenterology 08/2014; 147(6). DOI:10.1053/j.gastro.2014.08.029 · 16.72 Impact Factor
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    ABSTRACT: Background: Epidemiologic studies show an association between short sleep duration and the presence of nonalcoholic fatty liver disease (NAFLD). This study examined the association between short sleep duration and the onset of NAFLD. Methods: This community-based, retrospective, longitudinal cohort study included 6,370 Japanese subjects who had undergone annual health check-ups more than twice at a single center between April 2003 and March 2010. After excluding 3,941 subjects, the records of 2,429 Japanese subjects were reviewed. Results: Two groups comprised the study cohort: those with short (≤ 6 h) sleep durations (n = 1,543) and those with moderate (7-8 h) sleep durations (n = 886). During the observation period, 296 subjects developed NAFLD. Multivariate analysis identified an association between short sleep duration and the reduced onset of NAFLD in men (odds ratio: 0.551, 95% confidence interval 0.365-0.832, p = 0.005). There was no association between short sleep duration and NAFLD onset in women. The prevalence of NAFLD onset in men increased significantly as sleep duration increased, as follows: 12.5, 18.4, and 27.4% among subjects who had sleep durations of ≤ 4, 5-6, and 7-8 h, respectively (p = 0.02). Conclusions: This study demonstrates an association between sleep duration and NAFLD onset. Short sleep duration reduced the risk of NAFLD onset in men. Correct recognition is important to prevent disease progression and further complications.
    Journal of Gastroenterology 08/2014; 50(5). DOI:10.1007/s00535-014-0989-0 · 4.52 Impact Factor
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    ABSTRACT: Subclinical hypothyroidism (SCH) has been associated with type 2 diabetes mellitus. However, it is unknown whether common complications of type 2 diabetes, such as diabetic nephropathy, are also present with SCH. Here, we investigated the association between SCH and diabetic nephropathy among Japanese patients with type 2 diabetes mellitus. In this multicenter cross-sectional study, we recruited 414 such patients who had no previous history of thyroid disease. Serum thyroid hormone levels and the urinary albumin:creatinine ratio were measured. SCH was defined as an elevated thyroid-stimulating hormone (TSH) level (>4.0 mIU/L), and diabetic nephropathy was defined as creatinine levels ≥300 mg/g. The prevalence of SCH was 8.7% (n = 36) among patients with type 2 diabetes mellitus. The SCH group had a higher prevalence of dyslipidemia (p = 0.008) and diabetic nephropathy (p = 0.014) than the euthyroid group. Multivariate analysis identified significant positive associations between diabetic nephropathy and SCH (odds ratio [OR], 3.51; 95% confidence interval [CI], 1.10-10.0; p = 0.034), hypertension (OR, 4.56; 95% CI, 1.69-14.7; p = 0.001), and smoking (OR, 3.02; 95% CI, 1.14-7.91; p = 0.026). SCH may be independently associated with diabetic nephropathy in Japanese patients with type 2 diabetes mellitus.
    Endocrine Journal 08/2014; 61(10). DOI:10.1507/endocrj.EJ14-0206 · 2.00 Impact Factor
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    ABSTRACT: Nordic walking (NW), characterized by the use of two walking poles, has positive effects on several muscle groups. Muscle strength and mass decrease with age, and recently, this decrease is defined as sarcopenia. Sarcopenia may be triggered by oxidative stress. We investigated whether changes in the oxidative stress marker, malondialdehyde-modified low-density lipoprotein (MDA-LDL)/LDL-cholesterol (LDL-C) ratio are associated with change in handgrip strength (HGS), which is a useful indicator of sarcopenia, by a 12-week NW exercise among Japanese community-dwelling persons. The present study included 65 women aged 67 ± 7 years and 9 men aged 71 ± 8 years from a rural village. NW exercise of 120 min per week was performed for 12 weeks. Before and at the end of the 12-week intervention, various confounding factors and HGS were measured. 12-week changes in various factors were calculated by subtracting the baseline values from the 12-week values. Changes in HGS and follow-up HGS increased progressively with decreased changes in the MDA-LDL/LDL-C ratio after the 12-week walking exercise (r = -0.32, P = 0.006 and r = -0.35, P = 0.002, respectively). Multiple linear regression analysis showed that changes in HDL-C (β = 0.26, P = 0.019) and MDA-LDL/LDL-C ratio (β = -0.32, P = 0.004) were significantly and independently associated with changes in HGS. When the data were further stratified by gender, change in the MDA-LDL/LDL-C ratio was significantly and similarly associated with change in HGS in women only. These results suggest that change in MDA-LDL/LDL-C ratio may be a predictor for HGS after a 12-week NW exercise in community-dwelling persons.
    Endocrine 07/2014; 48(3). DOI:10.1007/s12020-014-0360-5 · 3.88 Impact Factor

Publication Stats

1k Citations
481.16 Total Impact Points


  • 2008-2015
    • Toronto Western Hospital
      Toronto, Ontario, Canada
  • 2001-2014
    • Ehime University
      • • Department of Gastroenterology and Metabology
      • • Department of Surgery II
      • • The Third Department of Internal Medicine
      Matuyama, Ehime, Japan
  • 2008-2010
    • University of Toronto
      • Department of Medicine
      Toronto, Ontario, Canada