Displaying publications 21 - 40 of 306 in total

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  1. Nor Mazni Ibrahim, Zuriati Ibrahim, Rosita Jamaluddin
    MyJurnal
    Introduction: Growing evidence highlighting the physical health risks linked with adolescent obesity and yet little is known on the role of psychosocial factors on the body weight status of adolescents. A cross sectional study was conducted to ascertain the associations between psychosocial factors (operationalised as weight teasing by peers, self-esteem and academic related stressor) with body weight status of adolescents in Hulu Langat District, Selangor, Malaysia. Methods: A total of 455 adolescents aged 13-16 years (50.3% male and 49.7% female) were recruited from five randomly selected schools through a multistage cluster sampling. Body weight and height were assessed and body mass index (BMI) was computed. Weight teasing by peers, self-esteem and academic related stressor were assessed using self-administered questionnaire of Perception of Teasing Scale (POTS), Rosenberg Self esteem Scale (RSE) and Secondary School Stressor (SSS) respectively. Results: The prevalence of overweight and obesity were 17.1% and 12.2%. Binary logistic regression revealed that adolescents who experienced weight teasing by their peers had 12 times higher odds to be overweight and obese. However, low self-esteem and high academic stressor were associated with a reduction in the likelihood of being overweight and obese. This rather contradictory results may be due to various factors that may affect the adolescents’ self-esteem and academic related stressor. Conclusion: Intervention programmes need to consider the peer environment of adolescents, increasing awareness on the effect of weight teasing by peers and further well designed study is crucial to stimulate the central understanding of psy- chosocial correlates to the adolescent obesity.
  2. Jamaluddin O, Zainal AA
    Med J Malaysia, 2004 May;59 Suppl B:143-4.
    PMID: 15468859
    Raising the thermal expansion coefficient (CTE) of dental porcelains is important to match the CTE of the ceramic material with the higher CTE of the metal inlay in dental restorations. The higher thermal expansion of the leucite phase increases the overall thermal expansion coefficient of the dental porcelain. Potassium nitrate (KNO3) additions in controlled percentages to the base dental porcelain formulation help in the formation of a leucite phase. The percentage added was 5,10 and 20 weight percent of leucite, respectively, to the total base frit composition. The change in CTE values was then investigated using a Linseis Dilatometer. A 20wt% KNO3 addition resulted in a CTE of 9.0 microm/m-K compared to the 7.7 microm/m-K CTE of the base composition. The microstructures observed under the scanning electron microscope (SEM) show a multiphase material with the leucite phases dispersed within a glassy matrix. The results suggest that higher CTEs in the dental porcelain are possible by increasing the KNO3- additions within the limits tested.
  3. Jamaluddin A, Pearson GJ
    Asian J Aesthet Dent, 1993 Jan;1(1):19-23.
    PMID: 8149147
    This study assessed the nature of the adhesion in repaired glass-ionomer restorative materials. Two chemically different glass-ionomer cements, Ketac Fil and Chemfil II Cap, and three different methods of conditioning the surface for repair were employed. Specimens of each material were prepared and the cut surfaces were then treated with either 35% phosphoric acid, 35% polyacrylic acid or a combination of phosphoric acid followed by polyacrylic acid. Freshly mixed material was injected against these treated surfaces and allowed to set under simulated intraoral conditions. The specimens were tested to failure in flexion after seven days storage. Assessment of the fractured surfaces was then carried out using the scanning electron microscope. The results showed the occurrence of both adhesive and cohesive failure.
  4. Parvaneh K, Jamaluddin R, Karimi G, Erfani R
    ScientificWorldJournal, 2014;2014:595962.
    PMID: 24587733 DOI: 10.1155/2014/595962
    A few studies in animals and a study in humans showed a positive effect of probiotic on bone metabolism and bone mass density. Most of the investigated bacteria were Lactobacillus and Bifidobacterium. The positive results of the probiotics were supported by the high content of dietary calcium and the high amounts of supplemented probiotics. Some of the principal mechanisms include (1) increasing mineral solubility due to production of short chain fatty acids; (2) producing phytase enzyme by bacteria to overcome the effect of mineral depressed by phytate; (3) reducing intestinal inflammation followed by increasing bone mass density; (4) hydrolysing glycoside bond food in the intestines by Lactobacillus and Bifidobacteria. These mechanisms lead to increase bioavailability of the minerals. In conclusion, probiotics showed potential effects on bone metabolism through different mechanisms with outstanding results in the animal model. The results also showed that postmenopausal women who suffered from low bone mass density are potential targets to consume probiotics for increasing mineral bioavailability including calcium and consequently increasing bone mass density.
  5. Jamaluddin JL, Huri HZ, Vethakkan SR
    Pharmacogenomics, 2016 06;17(8):867-81.
    PMID: 27249660 DOI: 10.2217/pgs-2016-0010
    AIM: To determine the clinical and genetic predictors of the dipeptidyl peptidase-4 (DPP-4) inhibitor treatment response in Type 2 diabetes mellitus (T2DM) patients.

    PATIENTS & METHODS: DPP4, WFS1 and KCNJ11 gene polymorphisms were genotyped in a cohort study of 662 T2DM patients treated with DPP-4 inhibitors sitagliptin, vildagliptin or linagliptin. Genotyping was performed by Applied Biosystems TaqMan SNP genotyping assay.

    RESULTS: Patients with triglyceride levels less than 1.7 mmol/l (odds ratio [OR]: 2.2.; 95% CI: 1.031-4.723), diastolic blood pressure (DBP) less than 90 mmHg (OR: 1.7; 95% CI: 1.009-2.892) and KCNJ11 rs2285676 (genotype CC) (OR: 2.0; 95% CI: 1.025-3.767) were more likely to response to DPP-4 inhibitor treatment compared with other patients, as measured by HbA1c levels.

    CONCLUSION: Triglycerides, DBP and KCNJ11 rs2285676 are predictors of the DPP-4 inhibitor treatment response in T2DM patients.

  6. Norazman CW, Adznam SN, Jamaluddin R
    PMID: 32916809 DOI: 10.3390/ijerph17186549
    Frailty is a multidimensional syndrome, which is a worldwide concern within the field of geriatrics due to the aggravating effect on the physical and mental functions of the elderly. This study aimed to determine the prevalence and risk factors of the frailty syndrome among urban-living community-dwelling elderly in Malaysia. A cross-sectional study was conducted among 301 community-dwelling elders. Frailty status was assessed using the Fried phenotype criteria. Depressive symptoms were assessed using the Geriatric Depression Scale (M-GDS-14), whereas the functional abilities and cognitive status were measured using the Lawton Instrumental Activities of Daily Living (Lawton IADL) scale and the Mini-Mental State Examination (MMSE-M), respectively. Malnutrition risk was observed through the abridged version (Short Form) of the Mini Nutritional Assessment (MNA-SF). Multinomial logistic regression analysis was employed to determine the significant predictors of the frailty syndrome. Three hundred and one elderly persons engaged in this study, with a mean age of 67.08 ± 5.536 ranging between 60 to 84 years old. The prevalence values of frailty and pre-frail were 15.9% and 72.8%, respectively, in which women appeared to be at a higher risk of frailty. The multivariate model revealed that frailty could be predicted from an increase in age, lower household income, being at risk of malnutrition, wasting (low skeletal muscle mass), and high serum C-reactive protein (CRP) level. A holistic approach is suggested for managing the frailty syndrome as it involves a decline in the multiple components of the geriatric syndrome.
  7. Yubbu P, Kaur J, Jamaluddin JA
    Cardiol Young, 2019 Aug;29(8):1101-1103.
    PMID: 31239005 DOI: 10.1017/S1047951119001458
    Purulent pericarditis leading to constrictive pericarditis is a rare but serious complication following invasive pneumococcal infection. Early recognition of this complication is crucial to prevent mortality. Here, we report a previously healthy child who developed constrictive pericarditis due to purulent pericarditis following necrotising pneumococcal pneumonia, which is not common in this current antibiotic and pneumococcal vaccine era. The child was successfully treated with pericardiectomy.
  8. Norazman CW, Adznam SN, Jamaluddin R
    Nutrients, 2020 Jun 08;12(6).
    PMID: 32521618 DOI: 10.3390/nu12061713
    Studies have been carried out on the association between frailty and malnutrition, but the similarities and divergence of the relationship remain debatable. This study aimed to explore the prevalence of malnutrition risk and frailty as well as the overlapping constructs. The associations that emerged were assessed independently of other risk factors. A total of 301 community-dwelling older adults with a mean age of 66.91 ± 5.59 years old were randomly recruited. Fried Criteria and Mini Nutritional Assessment-Short Form (MNA-SF) were used to assess frailty status and malnutrition, respectively. Other related nutritional assessments were assessed (body mass index (BMI), circumference measures, body fat % and skeletal muscle mass). The prevalence of frailty was 14.6% and prefrail was 59.7%; 29.6% were at risk of malnutrition, and 3.3% were malnourished. Malnutrition risk was significantly associated with a higher number of chronic diseases, BMI, circumference of mid-upper arm (MUAC), and calf, (CC)and skeletal muscle mass (SMM) and frailty, whereas frailty was significantly associated with higher number of chronic diseases, SMM and malnutrition. Frailty syndrome can be predicted with increasing age, body fat, lower skeletal muscle and malnutrition. Those who were frail were found to be five times more likely to be at risk of malnutrition. Results suggested that frailty and malnutrition shared considerable overlap, which emphasised the interrelated but discrete concepts. Therefore, the assessment of malnutrition is imperative and could be used as a practical implication in assessing frailty syndrome.
  9. Sthaneshwar P, Jamaluddin FA, Fan YS
    Pathology, 2010;42(5):454-6.
    PMID: 20632822 DOI: 10.3109/00313025.2010.493861
    The aim of this study was to evaluate the distribution of cardiac troponin I (cTnI) values, measured by the ADVIA TnI-Ultra method in a multi-ethnic group and to determine the imprecision of the assay.
  10. Mohd Ariffin ZA, Jamaluddin FA
    Malays J Pathol, 2020 Dec;42(3):395-400.
    PMID: 33361720
    INTRODUCTION: One commonly used equation which continues to be widely mentioned in text books and hence familiar to clinical people is total calcium + 0.02 (40 - albumin). This equation was derived using cresophthalein complexone and bromocresol green (BCG) methods for measuring serum total calcium and serum albumin respectively. However this equation maybe invalid when applied to calcium and albumin results generated by alternative assays. Hence we aim to derive an albumin-adjusted calcium equation specific to our laboratory's total calcium and albumin methodologies.

    MATERIALS AND METHODS: A total of 3,175 adult University Malaya Medical Centre (UMMC) patients deemed free of any calcium metabolism disorders were selected and divided into two groups for derivation and validation. Simple linear regression associating total calcium and albumin was constructed from the data in the derivation group. The new albumin-adjusted calcium equation was validated in the validation group. Differences in calcium status classification following adjustments based on existing and new albumin-adjusted calcium equation was compared in a 469 hypoalbuminaemic patients.

    RESULT: The new albumin adjusted calcium equation was: total calcium + 0.014 x (39-albumin). Of the 469 hypoalbuminemic patients, 78 were classified differently based on new equation. Based on the new equation, 55 normocalcemic patients were classified as hypocalcemic and 22 were classified as normocalcemic instead of hyperclacaemic.

    CONCLUSION: Based on the newly derived albuminadjusted calcium equation 17% of patients had different adjusted calcium classifications. This could potentially impact in the management. It is recommended that laboratories derive equations specific to their calcium/albumin methods and analytical platforms.

  11. Jamaluddin ND, Mohd Noor N, Goh HH
    Physiol Mol Biol Plants, 2017 Apr;23(2):357-368.
    PMID: 28461724 DOI: 10.1007/s12298-017-0429-8
    Genome-wide transcriptome profiling is a powerful tool to study global gene expression patterns in plant development. We report the first transcriptome profile analysis of papaya embryogenic callus to improve our understanding on genes associated with somatic embryogenesis. By using 3' mRNA-sequencing, we generated 6,190,687 processed reads and 47.0% were aligned to papaya genome reference, in which 21,170 (75.4%) of 27,082 annotated genes were found to be expressed but only 41% was expressed at functionally high levels. The top 10% of genes with high transcript abundance were significantly enriched in biological processes related to cell proliferation, stress response, and metabolism. Genes functioning in somatic embryogenesis such as SERK and LEA, hormone-related genes, stress-related genes, and genes involved in secondary metabolite biosynthesis pathways were highly expressed. Transcription factors such as NAC, WRKY, MYB, WUSCHEL, Agamous-like MADS-box protein and bHLH important in somatic embryos of other plants species were found to be expressed in papaya embryogenic callus. Abundant expression of enolase and ADH is consistent with proteome study of papaya somatic embryo. Our study highlights that some genes related to secondary metabolite biosynthesis, especially phenylpropanoid biosynthesis, were highly expressed in papaya embryogenic callus, which might have implication for cell factory applications. The discovery of all genes expressed in papaya embryogenic callus provides an important information into early biological processes during the induction of embryogenesis and useful for future research in other plant species.
  12. Sulaiman SH, Jamaluddin R, Sabran MR
    Nutrients, 2018 Apr 07;10(4).
    PMID: 29642443 DOI: 10.3390/nu10040460
    Aflatoxin is a food contaminant and its exposure through the diet is frequent and ubiquitous. A long-term dietary aflatoxin exposure has been linked to the development of liver cancer in populations with high prevalence of aflatoxin contamination in foods. Therefore, this study was conducted to identify the association between urinary aflatoxin M₁ (AFM₁), a biomarker of aflatoxin exposure, with the dietary intake among adults in Hulu Langat district, Selangor, Malaysia. Certain food products have higher potential for aflatoxin contamination and these were listed in a Food Frequency Questionnaire, which was given to all study participants. This allowed us to record consumption rates for each food product listed. Concomitantly, urine samples were collected, from adults in selected areas in Hulu Langat district, for the measurement of AFM₁ levels using an ELISA kit. Of the 444 urine samples collected and tested, 199 were positive for AFM₁, with 37 of them exceeding the limit of detection (LOD) of 0.64 ng/mL. Cereal products showed the highest consumption level among all food groups, with an average intake of 512.54 g per day. Chi-square analysis showed that consumption of eggs (X² = 4.77, p = 0.03) and dairy products (X² = 19.36, p < 0.01) had significant associations with urinary AFM₁ but both food groups were having a phi and Cramer's V value that less than 0.3, which indicated that the association between these food groups' consumption and AFM₁ level in urine was weak.
  13. Jamaluddin D, Mohd Noor N, Goh HH
    Genom Data, 2017 Jun;12:120-121.
    PMID: 28516036 DOI: 10.1016/j.gdata.2017.05.004
    Papaya is considered to be one of the most nutritional fruits. It is rich in vitamins, carotenoids, flavonoids and other phytonutrient which function as antioxidant in our body [1]. Previous studies revealed that the suppression of a negative regulator gene in photomorphogenesis, De-etiolated 1 (DET1) can improve the phytonutrient in tomato and canola without affecting the fruit quality [2], [3]. This report contains the experimental data on high-throughput 3' mRNA sequencing of transformed papaya callus upon DET1 gene suppression.
  14. Lim YJ, Jamaluddin R, Er YT
    Nutrients, 2018 Jun 25;10(7).
    PMID: 29941848 DOI: 10.3390/nu10070819
    A microscale built environment was the focus in this cross-sectional study which aimed to investigate the associations between platescapes, foodscapes, and meal energy intake among subjects. A total of 133 subjects (54 male, 79 female) with mean age 36.8 ± 7.3 years completed a self-administered questionnaire on sociodemographic characteristics, platescapes, and foodscape preferences. For platescapes, a plate mapping method was used, where subjects were required to place various sizes of food models on two different sized plates (23 cm and 28 cm) based on their preferences. For foodscape preferences, subjects were given a 23-cm plate and various food models differentiated by shapes and colours. Then, 24-h daily recalls (for one weekday and one weekend day) were obtained using interviews. Significant differences were observed in meal energy intake (p < 0.05) between males (1741 ± 339 kcal) and females (1625 ± 247 kcal) and also between age groups (p < 0.05). There was a significant difference (p < 0.0001) in terms of subjects’ meal energy intake when comparing 23-cm plates (419 ± 124 kcal) and 28-cm plates (561 ± 143 kcal). The bigger plate (28 cm) (p < 0.01) was significantly associated with subjects’ meal energy intakes, but this was not so for the 23-cm plate. There were significant differences in subjects’ meal energy when comparing white rice and multicoloured rice (p < 0.0001), unicoloured and multicoloured proteins (p < 0.0001), and unicoloured and multicoloured vegetables (p < 0.0001). There was a significant difference found between round- and cube-shaped proteins (p < 0.05). The colours of rice (p < 0.01), protein (p < 0.05), and vegetables (p < 0.05) were significantly associated with subjects’ meal energy. Only the shape of carrots in vegetables (p = 0.01) was significantly associated with subjects’ meal energy. Subconsciously, platescapes and foodscapes affect an individual’s energy intake, and thus these elements should be considered in assessing one’s dietary consumption.
  15. Jamaluddin N, Ariff AB, Wong FWF
    Biotechnol Prog, 2019 01;35(1):e2719.
    PMID: 30299004 DOI: 10.1002/btpr.2719
    Aqueous micellar two-phase system (AMTPS) is an extractive technique of biomolecule, where it is based on the differential partitioning behavior of biomolecule between a micelle-rich and a micelle-poor phase. In this study, an AMTPS composed of a nonionic surfactant, Triton X-100 (TX-100) was used for purifying a bacteriocin-like inhibitory substance (BLIS) derived from Pediococcus acidilactici Kp10. The influences of the surfactant concentration and the effect of additives on the partitioning behavior and activity yield of the BLIS were investigated. The obtained coexistence curves showed that the mixtures of solutions composed of different surfactant concentrations (5-30% w/w) and 50% w/w crude load were able to separate into two phases at temperatures of above 60 °C. The optimum conditions for BLIS partitioning using the TX-100-based AMTPS were: TX-100 concentration of 22.5% w/w, CFCS load of 50% w/w, incubation time of 30 min at 75 °C, and back-extraction using acetone precipitation. This optimal partitioning resulted in an activity yield of 64.3% and a purification factor of 5.8. Moreover, the addition of several additives, such as sorbitol, KCl, dioctyl sulfosuccinate sodium salt, and Coomassie® Brilliant Blue, demonstrated no improvement in the BLIS separation, except for Amberlite® resin XAD-4, where the activity yield was improved to 70.3% but the purification factor was reduced to 2.3. Results from this study have demonstrated the potential and applicability of TX-100-based AMTPS as a primary recovery method for the BLIS from a complex fermentation broth of P. acidilactici Kp10. © 2018 American Institute of Chemical Engineers Biotechnol. Prog., 35: e2719, 2019.
  16. Khalid K, Jamaluddin R, Ismail MS
    BMJ Open Qual, 2023 Jun;12(2).
    PMID: 37277216 DOI: 10.1136/bmjoq-2022-002139
    BACKGROUND: Poor employment rate among psychiatric patients is poorly discussed.

    PURPOSE: To share our strategies in boosting employment rate among stable psychiatric patients and discuss the lessons learnt.

    PARTICULAR FOCUS: Multifaceted strategies were remodelled to ensure a three-dimensional optimisation: (1) strengthening clinical service to ensure stable disease and appropriate patient selection through battery of assessments, (2) provision of psychosocial support to boost self-esteem and foster discipline among patients through encouragement, guidance and regular monitoring by the multidisciplinary community mental health team and (3) encourage willingness and confidence among stakeholders and local market to host job opportunities to stable mental health patients.

    OVERVIEW: The yearly employment rate among our stable psychiatric patients under supported employment programme from 2020 to 2021 was 28.6% (2/7) and 30.0% (3/10), respectively. A qualitative survey found the main hindrance to recruitment were employers' scepticism on work performance, while poor work retention was due to patients' lack of specific skill set and discipline to adhere to routine. We restructured our supported employment programme by adding the role of community mental health facility to foster discipline and routine for 6 months prior to referral to a job coach. Until June 2022, two out of five patients managed to secure job positions (40.0%). Despite our efforts to improve employment with the instituted remedial strategy, we still fail to reach the minimum standard set by ministry. Future plan will focus on tailoring individual interests to a specific set of skills that match industrial expectation prior to seeking employment. Additionally, enhancing public education using social media may foster better inclusion of psychiatric patients and social acceptance.

  17. Lee YS, Jamaluddin J, Ho BK
    PMID: 37593088 DOI: 10.51866/oa.285
    INTRODUCTION: Primary care service plays a vital role in early clinical assessment of patients with COVID-19 in Malaysia. This study aimed to evaluate the potential risk factors of COVID-19 severity at presentation to primary care facilities in the post-vaccination period.

    METHOD: Clinical records from the Selangkah system of all patients with COVID-19 aged above 18 years seen at COVID-19 assessment centres located in 10 government health clinics in Gombak district, Selangor, from 1 October to 31 December 2021 with complete documentation and outcomes were retrieved. Demographics, comorbidities, clinical features and vaccination statuses and types were retrospectively evaluated. The variables were compared between mild and severe diseases. Univariate and multivariable logistic regressions were used to identify the factors affecting disease severity.

    RESULTS: A total of 4406 patients (median age=37 years, men=51.2%) were analysed. Approximately 97.1% of the cases were mild, while 2.9% were severe. Fever, difficulty breathing, lethargy, throat irritation/runny nose, oxygen saturation of <95%, respiratory rate of >20 breaths per minute, CoronaVac vaccination and hypertension were the determinants of severity (P<0.05).

    CONCLUSION: The high proportion (97.1%) of mild cases in this study compared with an earlier report (81.8%) during the pre-vaccination period may suggest the impact of vaccine, as 84.9% of this cohort was fully vaccinated. Our study also demonstrated a significant difference in COVID-19 severity between the vaccine types. The identified clinical features and comorbidities could assist primary care doctors in stratifying patients with COVID-19 judiciously in terms of hospital referral or home quarantine.

  18. Jamaluddin J, Mohamed Kamel MA, Jamil SN
    PMID: 37205147 DOI: 10.51866/tyk.291
    We describe the case of a 72-year-old housewife who presented to a primary care specialist clinic for reassessment following multiple hospitalisations for heart failure within the past 9 months. She presented with decreased effort tolerance and tiredness for the past 1 year. Her symptoms had remained the same despite current treatment. During the initial history-taking, she did not report any medical illnesses or surgeries. She had been well and had not undergone any screening for almost 30 years before the first hospitalisation for heart failure. There was neither cough, constipation, dyspepsia, abdominal pain, stool changes, haematuria, per vaginal bleeding nor hoarse voice. The physical examination findings were remarkable for slow movement and speech. Her skin was dry with a markedly increased serum lipid profile. Further investigation and management confirmed the suspected diagnosis.
  19. Rasidi WNA, Seluakumaran K, Jamaluddin SA
    Eur Arch Otorhinolaryngol, 2023 Oct;280(10):4391-4400.
    PMID: 36988687 DOI: 10.1007/s00405-023-07929-7
    PURPOSE: Pure-tone audiometry (PTA) is the gold standard for screening and diagnosis of hearing loss but is not always accessible. This study evaluated a simplified cochlear frequency selectivity (FS) measure as an alternative option to screen for early frequency-specific sensorineural hearing loss (SNHL).

    METHODS: FS measures at 1 and 4 kHz center frequencies were obtained using a custom-made software in normal-hearing (NH), slight SNHL and mild-to-moderate SNHL subjects. For comparison, subjects were also assessed with the Malay Digit Triplet Test (DTT) and the shortened Malay Speech, Spatial and Qualities of Hearing Scale (SSQ) questionnaire.

    RESULTS: Compared to DTT and SSQ, the FS measure at 4 kHz was able to distinguish NH from slight and mild-to-moderate SNHL subjects, and was strongly correlated with their thresholds in quiet determined separately in 1-dB step sizes at the similar test frequency. Further analysis with receiver operating characteristic (ROC) curves indicated area under the curve (AUC) of 0.77 and 0.83 for the FS measure at 4 kHz when PTA thresholds of NH subjects were taken as ≤ 15 dB HL and ≤ 20 dB HL, respectively. At the optimal FS cut-off point for 4 kHz, the FS measure had 77.8% sensitivity and 86.7% specificity to detect 20 dB HL hearing loss.

    CONCLUSION: FS measure was superior to DTT and SSQ questionnaire in detecting early frequency-specific threshold shifts in SNHL subjects, particularly at 4 kHz. This method could be used for screening subjects at risk of noise-induced hearing loss.

  20. Jamaluddin FN, Ibrahim F, Ahmad SA
    J Healthc Eng, 2023;2023:1951165.
    PMID: 36756137 DOI: 10.1155/2023/1951165
    In sports, fatigue management is vital as adequate rest builds strength and enhances performance, whereas inadequate rest exposes the body to prolonged fatigue (PF) or also known as overtraining. This paper presents PF identification and classification based on surface electromyography (EMG) signals. An experiment was performed on twenty participants to investigate the behaviour of surface EMG during the inception of PF. PF symptoms were induced in accord with a five-day Bruce Protocol treadmill test on four lower extremity muscles: the biceps femoris (BF), rectus femoris (RF), vastus medialis (VM), and vastus lateralis (VL). The results demonstrate that the experiment successfully induces soreness, unexplained lethargy, and performance decrement and also indicate that the progression of PF can be observed based on changes in frequency features (ΔF med and ΔF mean) and time features (ΔRMS and ΔMAV) of surface EMG. This study also demonstrates the ability of wavelet index features in PF identification. Using a naïve Bayes (NB) classifier exhibits the highest accuracy based on time and frequency features with 98% in distinguishing PF on RF, 94% on BF, 9% on VL, and 97% on VM. Thus, this study has positively indicated that surface EMG can be used in identifying the inception of PF. The implication of the findings is significant in sports to prevent a greater risk of PF.
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