Variations in abdominal muscle activities of obese females during abdominal bracing exercise in different body positions.

AIMS: This study evaluated the activities of the Rectus Abdominis (RA) and Transversus Abdominis (TrA) muscles during abdominal bracing exercises (ABE) in different body positions. METHODOLOGY: Electrical activities of both components of the RA and TrA muscles were assessed respectively in 25 obese females via surface electromyography during ABE in four (4) different body positions (crook lying, side lying, standing, and sitting). Each trial lasted for five (5) seconds with an hour rest period between trials. RESULTS: Electrical activities of each of the right RA (p = 0.008) and TrA (p = 0.001) muscles significantly varied across the four trials. For the left components of the RA (p = 0.243) and TrA (p = 0.332) muscles, no significant differences were observed across trials. The highest muscular activities were recorded during the standing trial while the crook lying position resulted in the least muscular activities. CONCLUSION: For the best results, abdominal bracing exercises should be performed in a standing position. The efficacy of adopting these body positions for long-term rehabilitation purposes should be investigated in future studies.

Comparison of self-reported ability to perform Kegel's exercise pre- and post-coital penetration in postpartum women.

We compared the self-reported ability to perform Kegel's exercises pre- and post-coital penetration in postpartum women. A cross-sectional design. Twenty-seven postpartum women with mild urinary incontinence were recruited. Measures included perceived strength of pelvic floor muscle contraction (Strength of Contraction [SOC] scale] and ease of performing Kegel's exercises (Ease of Performance [EOP] scale). These measures as well as information on attaining orgasm were collected in one session, pre- and post-coital penetration. Findings showed that both measures (SOC and EOP) varied significantly (p < 0.001) pre- and post-coital penetration, with decreasing values post-coitus. Additionally, the outcomes of both measures showed no significant differences (p < 0.05) between women who reached orgasm and those who did not. Self-reported ability to perform Kegel's exercise immediately after coital penetration is reported to affect the appropriateness of its performance and effective outcomes. Thus, women should be discouraged from performing Kegel's exercises immediately post-coitus.

Effects of abdominal girdle belt on pulmonary function variables of postpartum women in Enugu, Nigeria: a quasi-experimental study.

This quasi-experimental study was aimed at investigating the effects of wearing an abdominal girdle belt on pulmonary function variables of postpartum women. 40 consenting postpartum women aged between 18 and 35 years were recruited from a post-natal clinic in Enugu, Nigeria. The participants were conveniently assigned into girdle belt and control groups (20 each). Their lung function (forced expiratory volume in first second[FEV1], and %FEV1, forced vital capacity[FVC], peak expiratory flow [PEF], forced expiratory flows [25th, 75th & 25-75th percentiles]) values were measured prior to and after eight weeks of the study intervention period for each participant. Data obtained were analysed using descriptive and inferential statistics. Following the intervention period, 19 and 13 participants completed the study in the girdle belt and control groups, respectively. The main results showed that both groups were comparable at baseline for all the study variables assessed (p > 0.05). Following the intervention period, only the PEF was significantly reduced in the girdle belt group compared to control group participants (p = 0.012). Thus, wearing girdle belts for an extended period of time has no effect on the lung function values of postpartum women.IMPACT STATEMENTWhat is already known on the subject? Postpartum abdominal girdle belts are commonly utilised for resolution of abdominal protrusion and obesity after childbirth. Unfortunately, several adverse effects, including bleeding, compressive pain and discomfort and abnormally increased intra-abdominal pressure, have been associated with this practice. Consistent increase in intra-abdominal pressure of variable duration has been reported to affect pulmonary functions.What do the results of this study add? The study findings indicate that wearing girdle belts for eight weeks by postpartum women has no substantial effect on the pulmonary function variables.What are the implications of these findings for clinical practice and/or further research? Utilisation of abdominal girdle belts of equal or less than 8 weeks duration should not be discouraged for post-partum women due to fear of its potential negative impact on pulmonary function.

Breastfeeding-related neck pain: prevalence and correlates among Nigerian lactating mothers.

BACKGROUND: Breastfeeding (BF) is a physically demanding task and is predominantly performed in a head-down position as the mother attempts to maintain eye contact with the infant. There are possibilities of BF-related neck pain (BFRNP) that have not been widely studied. This study investigated the prevalence and correlates of BFRNP in Nigerian lactating mothers. METHODS: A cross-sectional descriptive survey was conducted among 310 lactating mothers selected from post-natal clinics in Enugu, Nigeria. Information on their BF profile was sought as well as the prevalence and characteristics of BFRNP using a self-structured questionnaire. RESULTS: It was found that cradle hold was the commonly adopted BF position (94.0%) and the majority breastfed ≥10 times daily (55.2%) for <30 min per session (49.1%). BFRNP was seen in 51.7% of women, of which 55.0% reported moderate pain intensity and 60.0% experienced this pain during BF. None of the maternal characteristics and breastfeeding profiles were significantly associated with the prevalence of BFRNP (p>0.05). CONCLUSIONS: There is a high prevalence of BFRNP among nursing mothers. Although maternal characteristics and BF positions were not associated with reported BFRNP, the results suggest that changing BF positions reduces neck pain during nursing sessions. Therefore this study recommends that nursing mothers should regularly change their BF positions to increase relaxation and comfort.

Comparative effects of selected abdominal and lower limb exercises in the recruitment of the pelvic floor muscles: Determining adjuncts to Kegel's exercises.

PURPOSE: This study evaluated the electrical activities of the pelvic floor muscles in response to selected abdominal and hip adductor exercises, using the Kegel's maneuver as a gold standard, to compare the efficacies of these maneuvers in pelvic floor muscles recruitment to guide their informed utilization as adjuncts for Kegel's exercises. METHOD: Twenty-one postpartum mothers with recent vaginal deliveries performed six trials, including the typical Kegel's exercise; two abdominal exercises (curl-up and abdominal hollowing); two hip adductor exercises (adductor ball squeeze and auto-resisted hip adduction); and a combination of abdominal, hip adductor and pelvic floor muscle contractions (combo). Pelvic floor muscles activities were monitored via surface electromyography during each 5-s trial. Data were analyzed with descriptive statistics and inferential statistics of one way ANOVA at p < 0.05. RESULTS: Generally, the pelvic floor muscles were statistically significantly (p < 0.001) most active during the combo trial, compared to other trials. Comparing the two abdominals, Kegel's and combo trials, pelvic floor muscles activity was least during the curl-up contraction (p < 0.001). On the other hand, Kegel's trial elicited the lowestpelvic floor muscles activity when compared with the combo and two adductor trials (p < 0.001). CONCLUSION: Abdominal and hip adductor exercises are recommended adjuncts of Kegel's exercise but the combo maneuver was the most effective in activating the pelvic floor muscles.

Pulmonary functions and associated risk factors among school teachers in a selected Nigerian population.

Objective. This study aimed to determine pulmonary functions and associated risk factors among school teachers. Methods. This cross-sectional ex-post facto study included 121 participants (20 males and 101 females). The setting for this study included 11 private schools and eight government schools. Participants were recruited using non-probability sampling techniques. Subjective data were collected using a self-administered asthma questionnaire. A spirometer was used for measuring pulmonary function values and data were analyzed using descriptive statistics and one-way analysis of variance for inferential statistics. The α level was set at 0.05. Results. Age, gender, duration of employment, type of school, school level taught, type of teaching board, working hours per day, previous occupation, usage of carpet and usage of rugs were significantly associated with the forced vital capacity prediction (p = 0.000, 0.010, 0.000, 0.032, 0.013, 0.000, 0.027, 0.000, 0.000 and 0.041, respectively). Also, the forced expiratory volume in 1 s and the peak expiratory flow were statistically different with alcohol consumption (p = 0.015) and place of residence (p = 0.004), respectively. Conclusion. Teachers using chalkboards are at increased risk of developing occupationally related pulmonary impairments. Hence, there is a need to shift from routine chalkboards to whiteboards.

Infant-carrying techniques: Which is a preferred mother-friendly method?

Infant carrying is still trendy among African mothers than in other climes, however, carrying techniques vary mostly along cultural divides. Using a pretest-posttest quasi-experimental design, the authors evaluated the effect of three types of infant-carrying techniques on cardiopulmonary function, metabolic expenditure, fatigue demand, and locomotion. Front wrap infant-carrying technique led to a marginally higher cardiopulmonary demand. Hip sling technique resulted in greater metabolic expenditure and oxygen consumption with high rate of perceived exertion, while back wrap technique did not significantly decrease locomotion parameters. The authors recommend back wrap infant carrying technique based on its slightly lower effects on cardiopulmonary function, metabolic expenditure, fatigue demand, and locomotion.

Evaluation of trunk muscle activities in response to three breastfeeding positions utilised by women.

BACKGROUND: High prevalence of breastfeeding (BF)-related musculoskeletal disorders (MSDs) in nursing mothers have been reported in previous studies. Studies are scarce on the biomechanical effects of the commonly utilized BF positions. OBJECTIVE: This study evaluated the electromyographic (EMG) activities of the trunk muscles in response to three BF positions commonly utilized by mothers globally. METHODS: 20 non-pregnant nulliparous females participated in this experimental study. EMG activities from erector spinae (ES) and external oblique (EO) muscles were recorded bilaterally in three BF conditions: cradle (C1); cross-cradle (C2); football (FB). Data were analyzed using descriptive statistics and inferential statistics of one-way analysis of variance with alpha level set at 0.05. RESULTS: The activity levels of right EO and ES muscles significantly increased during the C2 hold, while the left EO and ES muscles revealed significantly higher EMG levels in the C1 trial. Asymmetrical activity between the right and the left parts of the EO muscle was significantly higher during the C2 hold. CONCLUSION: These findings suggest that compared to C2 and C1 holds, FB hold may be more biomechanically efficient relative to its decreased muscular demands. The physical stresses associated with BF may be higher with the adoption of C2 and C1 holds, especially for prolonged periods.

Prevalence, pattern and correlates of work-related musculoskeletal disorders among school teachers in Enugu, Nigeria.

Introduction. There is insufficient literature on the prevalence of and risk factors for work-related musculoskeletal disorders (MSDs) among teachers in Nigeria. This study aimed to investigate the prevalence of work-related MSDs and their associations with occupational and socio-demographic factors of Nigerian-based school teachers. Materials and methods. Socio-demographic and occupational characteristics, prevalence and pattern of work-related MSDs of 352 school teachers (age 24-60 years) were investigated using a standard Nordic questionnaire. Data were summarized with descriptive statistics. Univariate and multivariate analyses were used to assess predictors of work-related MSDs. Results. The results showed that 70.2% of the teachers had work-related MSDs predominantly in the shoulder (62.3%) and neck (57.9%) regions. Most of the studied socio-demographic features and anthropometric and occupational characteristics were significantly associated (p < 0.05) with MSDs in at least one body region. Conclusions. There was a prevalence of work-related MSDs among the teachers. Advanced educational qualification, elevated teaching boards, teaching experience over 10 years and age range of 35-50 years were the major predictors of MSDs.

Determining safe teaching board heights through electromyographic analysis of the shoulder muscles.

BACKGROUND: Adjustable teaching boards have been recommended as an ergonomic practice geared at reducing the incidences of teaching-related shoulder musculoskeletal disorders among teachers. However, there are no standards guiding choice of appropriate teaching board heights. This study was aimed at evaluating shoulder muscle activities in response to five teaching board heights. METHODS: Thirty participants performed writing activities on five different board heights (Diff10 = standing height minus 10% of standing height; NormH = participant's standing height; Sum10 = standing height plus 10% of standing height; Sum20 = standing height plus 20% of standing height; Sum25 = standing height plus 25% of standing height). Electromyographic analysis of the anterior deltoid (AD), upper trapezius (UT), serratus anterior (SA) and pectoralis major (PM) muscles were performed simultaneously during each task. Data were analyzed with one-way ANOVA and independent T-test at p < 0.05. RESULTS: Sum20 board height significantly (p < 0.001) elicited the highest activities in the AD (19.35 ± 11.26%) and UT (29.06 ± 29.53%) muscles while SA (20.37 ± 10.87%) and PM (20.86 ± 12.17%) muscles were most active at Sum25 board height. SA and PM muscles progressively increased with increasing board heights while AD and UT muscles showed alternating patterns of activation at increasing board heights. For safe ergonomic practices, recommended teaching board heights should be within the range of NormH and Sum10. CONCLUSION: Extremely high or low teaching boards have tendencies of inducing musculoskeletal shoulder discomforts.

Biomechanical analysis of the three recommended breastfeeding positions.

BACKGROUND: For maternal and infant benefits, cradle, cross-cradle and football hold positions have been recommended and widely utilized by mothers during breastfeeding (BF) tasks. There is paucity of data on the biomechanical costs of these BF positions. OBJECTIVE: This study evaluated the trunk lean angles and electromyographic (EMG) activities of the trunk muscles during these BF positions. METHODS: In this experimental study, 25 nulliparous females carried a 6-kg weighing infant, while simulating BF tasks in each of the three BF hold positions for five minutes respectively. During each task, forward and lateral trunk lean angles were measured with a single inclinometer. Activities of the right and left erector spinae (ES) and external oblique (EO) muscles were also measured via surface electromyography. One-way analysis of variance was used to analyze data at a significance level of 0.05. RESULTS: Cross-cradle position resulted in significantly higher anterior trunk lean and right ES and EO muscle activities. Conversely, cradle position significantly elicited highest activities in the left ES and EO muscles. Left trunk lean angles were highest during the football position. CONCLUSION: Football BF position may pose less risk of BF-related musculoskeletal disorders in nursing mothers, as compared to the cradle and cross-cradle BF positions.

Electromyographic activity of the neck muscles: Effects of varying standing height-derived teaching board heights.

BACKGROUND: Despite the increasing emergence of modern facilities, the ancient practice of writing on a teaching board is still common in the teaching profession. Ergonomic guidelines of this practice are required for the prevention of work-related neck musculoskeletal disorders inherent of teachers. OBJECTIVE: This study investigated the effects of varying teaching board heights on the activities of the neck muscles. METHODS: Thirty participants (15 males and 15 females) participated in this experimental study. Each performed writing tasks on a teaching board set at five different heights derived from their standing height (SH) [(D 10 = SH minus 10% of SH; Norm H = SH; Sum 10 = SH plus 10% of SH; Sum 20 = SH plus 20% of SH; Sum 25 = SH plus 25% of SH)]. Electromyographic (EMG) activities of both components of the sternocleidomastoid and upper trapezius muscles were measured during each task. Asymmetry ratio of right and left muscle components were determined. Data were analyzed with one-way ANOVA. RESULTS: EMG activities of the four muscles as well as their asymmetry ratios significantly (p< 0.01) increased with increasing board heights. CONCLUSION: Teaching board-related tasks have increased possibilities of inducing neck disorders when performed beyond Norm H vertical heights.

Evaluation of selected cardiopulmonary and perceived exertion responses to four infant carrying methods utilised by African Mothers.

Various infant carrying methods (ICMs) are utilised for childcare. Effects of these ICMs on the cardiopulmonary system are not known. This study evaluated cardiopulmonary and perceptual responses to four ICMs (back, front, side and in-arms) among 30 young females (18-35 years) while walking with a 6 kg simulated infant. Diastolic blood pressure (BP) responses were significantly different (p = .009) across the four ICMs, with the back ICM eliciting highest response. Heart rate, respiratory rate and systolic BP responses were not significantly different (p > .05) across the ICMs. Participants perceived the in-arms ICM as the most exerting. Body weight (p = .036) and body mass index (BMI) (p = .011) significantly correlated with systolic BP responses during the side ICM while age significantly (p = .036) correlated with heart rate changes during the in-arms ICM. Back ICM may pose more risk of diastolic BP dysfunctions. Increased body weight and BMI result in decreased systolic BP responses. IMPACT STATEMENT What is already known on this subject? Infant carrying (IC) has been associated with increased energy cost, biomechanical changes and musculoskeletal injuries. There is paucity of data on the cardiopulmonary responses to IC. What do the results of this study add? Back ICM resulted in higher responses in diastolic blood pressure. During the side ICM, participants' systolic BP decreased with increasing body weight and BMI values. Increased age resulted to decreased heart rate responses during the in-arms ICM. What are the implications of these findings for clinical practice and/or further research? There is need for effective monitoring of the cardiopulmonary parameters during IC tasks, especially among women with cardiopulmonary dysfunctions. Women with diastolic dysfunctions should be discouraged from utilising the back ICM. It is necessary for further studies to evaluate infant carrying-related cardiopulmonary responses relative to various components of IC practices, including weight of infant, maternal anthropometric characteristics and duration of IC tasks during each infant carrying method.

Prevalence and associated factors of work related musculoskeletal disorders among commercial milling machine operators in South-Eastern Nigerian markets.

BACKGROUND: Milling machine operators perform physically demanding tasks that can lead to work related musculoskeletal disorders (WRMSDs), but literature on WRMSDs among milling machine operators is scarce. Knowledge of prevalence and risk factors of WRMSDs can be an appropriate base for planning and implementing ergonomics intervention programs in the workplace. OBJECTIVE: This study aimed to determine the prevalence, pattern and associated factors of WRMSDs among commercial milling machine operators in Enugu, Nigeria. METHODS: This cross-sectional survey involved 148 commercial milling machine operators (74 hand-operated milling machine operators (HOMMO) and 74 electrically-operated milling machine operators (EOMMO)), within the age range of 18-65 years, who were conveniently selected from four markets in Enugu, Nigeria. A standard Nordic questionnaire was used to assess the prevalence of WRMSDs among the participants. Data were summarized using descriptive statistics. RESULTS: There was a significant difference (p = 0.001) related to prevalence of WRMSDs between HOMMOs (77%) and EOMMOs (50%). All body parts were affected in both groups and shoulders (85.1%) and lower back (46%) had the highest percentage of prevalence. Working in awkward and same postures, working with injury, poor workplace design, repetition of tasks, vibratory working equipments, reduced rest, high job demand and heavy lifting were significantly associated with the prevalence of WRMSDs. CONCLUSIONS: WRMSDs are prevalent among commercial milling machine operators with higher occurrence in HOMMOs. Ergonomic interventions, including the re-design of milling machines and appropriate work posture education of machine operators are recommended in the milling industry.

Correlation between Foot Arch Index and the Intensity of Foot, Knee, and Lower Back Pain among Pregnant Women in a South-Eastern Nigerian Community.

OBJECTIVES: The aim of this study was to assess the arch height index of pregnant women and its correlation with foot pain, anterior knee pain, and lower back pain. SUBJECTS AND METHODS: Two hundred and fifteen consenting pregnant women participated in this cross-sectional study. The arch height index was assessed from their foot prints, while pain intensity was rated on a numerical rating scale. Data were summarized with descriptive statistics and the Pearson correlation was used to determine correlations between the variables at p < 0.05. RESULTS: Of the 215 pregnant women, 123 (57.2%) and 127 (59.9%) had low arch heights on the right and left feet, respectively, and the mean arch height indices were 0.27 ± 0.71 for the right foot and 0.28 ± 0.07 for the left foot. The prevalence of foot, knee, and lower back pain was 65 (30.2%), 43 (20.0%), and 93 (43.3%), respectively. The Pearson correlation analysis did not reveal any significant relationship (p > 0.05) between foot pain and each of the right (r = -0.010, p = 0.886) and left (r = 0.004, p = 0.955) arch indices as well as between knee pain and each of the right (r = 0.042, p = 0.536) and left (r = 0.045, p = 0.515) arch indices. A similar trend was observed for the lower back, which also did not show any significant relationship to each of the right (r = 0.026, p = 0.703) and left (r = 0.097, p = 0.157) arch indices. CONCLUSION: The study participants had a high prevalence of low foot arches, indicating pes planus. Lower back pain was more common than foot and knee pain. The foot arch heights did not show any relationships between the intensities of foot, anterior knee, and lower back pain.

Infant carrying methods: Correlates and associated musculoskeletal disorders among nursing mothers in Nigeria.

Infant carrying is an integral part of the mothering occupation. Paucity of data exists on its correlates and associated musculoskeletal injuries. In this study, factors and musculoskeletal injuries associated with infant carrying were investigated in 227 nursing mothers, using a structured questionnaire. 77.1% utilised the back infant carrying methods (ICM). Maternal comfort was the major factor influencing participants' (37.4%) choices of ICMs. Infant's age (p = .000) and transportation means (p = .045) were significantly associated with ICMs. Low back pain (82.8%) and upper back pain (74.9%) were the most reported musculoskeletal discomforts associated with ICMs, especially among women who utilised back ICM. Back ICM is predominantly used by nursing mothers. Impact statement Infant carrying has been associated with increased energy cost and biomechanical changes. Currently, there is a paucity of data on infant carrying-related musculoskeletal injuries. In this study, investigating factors and musculoskeletal injuries associated with infant carrying, the results showed that back infant carrying method is predominantly used by nursing mothers. Age of the infant and mothers' means of transportation were determinant factors of infant carrying methods. Among the several reported infant carrying-related musculoskeletal disorders, low back and upper back pain were the most prevalent, especially among women who utilised the back infant carrying method. There is need for women's health specialists to introduce appropriate ergonomic training and interventions on infant carrying tasks in order to improve maternal musculoskeletal health during the childbearing years and beyond. Further experimental studies on the effects of various infant carrying methods on the musculoskeletal system are recommended.