ABSTRACT
Measurement of human energy expenditure during crop production helps in the optimization of production operations and costs by identifying steps which that can benefit from the use of appropriate mechanization technologies. This study measures human energy expenditure associated with all 6 major rice (Oryza sativa L.) cultivation operations using two measurement methods-i.e. conventional human energy expenditure method and direct measurement with a Garmin forerunner 35 body media. The aim of this study was to provide a detailed comparison of these two methods and document the human energy costs in a manner that will identify steps to be taken to help optimize agricultural practices. Results (mean + 95%CL) revealed that the total human energy expenditure obtained through the conventional method was 25.5% higher (33.3 ± 1 versus 26.6 ± 1.3) in transplanting and 26.1% higher (30.3 ± 1.9 versus 24.0 ± 2.1) than the human energy expenditure recorded using the Garmin method in broadcast seeding method. Similarly, during the harvesting operation, the conventional measurement and Garmin measurement methods differed significantly, with the conventional method the human energy expenditure was 89.9% higher (3.2 ± 0.4 versus 1.68 ± 0.2) in the fields using the transplanting and 88.7% higher (3.3 ± 0.5 versus 1.8 ± 0.3) in the fields using the broadcast seeding than the human energy expenditure recorded using the Garmin method. When using Garmin method, the human energy expenditure in the case of using the midsize combine harvester was 13.49% lesser (592.4 ± 67.2 versus 522.0 ± 75.1) than the case of using conventional one. Results based on heart rate also indicated that operations such as tillage were less intensive (72 ± 3.3 bpm) compared with operations such as chemicals spraying (135 ± 4 bpm). Although we did not have a criterion measure available to determine which method was the most accurate, the Garmin measurement gives an estimate of actual physical human energy expended in performing a specific task with consider all conditions and thus more information to aid in identifying critical operations that could be optimized and mechanized.
ABSTRACT
BACKGROUND: Adolescents have special reproductive health needs, but these peculiar needs are often unmet in many cultures and countries. METHODS: A cross-sectional study involving adolescents in three secondary schools in a northern Nigerian setting. Demographic characteristics as well as reproductive health issues (adolescent sex, abortion, sexual experience) among the students were surveyed. RESULTS: Of the 1070 students that fully participated in the survey, 539 (50.4%) were girls and 531 (49.6%) boys. They were aged 10 - 27 years (median 16 Years). Five hundred forty three (50.7%) were Christians and 499 (46.6%) Muslims. Nine hundred and four (84.5%) of the students knew about abortion. On their view about reasons why adolescents indulge in premarital sex, 574 (53.6%) felt it was to please boyfriend/girlfriend, 391 (36.5%) to experiment with sex, 312 (29.6%) to test fertility and 239 (22.3%) felt it was to stop painful menstruation. One hundred thirty five (12.6%) have had sex and 15 - 19 years age group were more likely to be sexually active. Twelve (1.1%) of the girls had been pregnant once - four times before and all had an abortion. Children of civil servants were significantly more likely to be sexually active compared to other groups of children (p <0.05). All the respondents knew one or more complication of abortion to include inability to get pregnant in future 682 (63.7%), abdominal pain 589 (55%) and painful menstruation 427 (39.9%). CONCLUSION: Adolescents are unique in every way including issues of reproductive health. The age at sexual debut in this setting is early. There is a need to include reproductive health education in the curriculum of secondary schools. This should help the adolescents to obtain the correct information from the right source.
