OBJECTIVES: Long-term heavy work impairs employees, and they may retire prematurely by law. We investigated the value of energy expenditure (EE) during work shifts as a means to define heavy workload. METHODS: The study comprised 79 male [mean age 32.2 (standard deviation [SD] 7.5) years] and 33 female [33.5 (SD 11.2) years] employees in different occupations classified as "heavy work" (EE of 1400 and 2000 kcal for women and men, respectively). Cycle ergometry determined exercise performance. Gas exchange measures were performed during selected phases of work, and heart rate (HR) recordings were obtained for a complete work shift. EE was calculated from gas exchange measures. RESULTS: Male and female subjects differed significantly for maximal power output (P(max)) [men=206.3 (SD 47.3) watts; women=149.6 (SD 36.1) watts] and maximal oxygen consumption (VO(2max)) [men=2.965 (SD 0.63) l/min; women= 1.958 (SD 0.50) l/min] in the cycle ergometer test. Shift HR (HR(Sh)) was found between 102 (SD 14) b/min [57.6 (SD 8.5) % HR(max)] and 99 (SD 10) b/min [55.5 (SD 5.9) % HR(max)] dependent on tasks and groups. Working EE was found between 1864 (SD 732) kcal and 1249 (SD 609) kcal for men and women, respectively, but approximately 60% of subjects were well below the legal limits. CONCLUSIONS: The legal definition of heavy workload by mean working EE per 8-hour work shift applies to all investigated occupations; however, a substantial proportion of workers may not fulfill the criterion if applied individually. Alternative definitions of heavy workload in terms of absolute oxygen consumption or EE relative to cardiorespiratory fitness lead to similar classification results of the investigated occupations.
OBJECTIVES: Long-term heavy work impairs employees, and they may retire prematurely by law. We investigated the value of energy expenditure (EE) during work shifts as a means to define heavy workload. METHODS: The study comprised 79 male [mean age 32.2 (standard deviation [SD] 7.5) years] and 33 female [33.5 (SD 11.2) years] employees in different occupations classified as "heavy work" (EE of 1400 and 2000 kcal for women and men, respectively). Cycle ergometry determined exercise performance. Gas exchange measures were performed during selected phases of work, and heart rate (HR) recordings were obtained for a complete work shift. EE was calculated from gas exchange measures. RESULTS: Male and female subjects differed significantly for maximal power output (P(max)) [men=206.3 (SD 47.3) watts; women=149.6 (SD 36.1) watts] and maximal oxygen consumption (VO(2max)) [men=2.965 (SD 0.63) l/min; women= 1.958 (SD 0.50) l/min] in the cycle ergometer test. Shift HR (HR(Sh)) was found between 102 (SD 14) b/min [57.6 (SD 8.5) % HR(max)] and 99 (SD 10) b/min [55.5 (SD 5.9) % HR(max)] dependent on tasks and groups. Working EE was found between 1864 (SD 732) kcal and 1249 (SD 609) kcal for men and women, respectively, but approximately 60% of subjects were well below the legal limits. CONCLUSIONS: The legal definition of heavy workload by mean working EE per 8-hour work shift applies to all investigated occupations; however, a substantial proportion of workers may not fulfill the criterion if applied individually. Alternative definitions of heavy workload in terms of absolute oxygen consumption or EE relative to cardiorespiratory fitness lead to similar classification results of the investigated occupations.
Authors: Alexandra M Preisser; Linfei Zhou; Marcial Velasco Garrido; Volker Harth Journal: Int Arch Occup Environ Health Date: 2015-06-19 Impact factor: 3.015
Authors: Jonas Mundwiler; Ulla Schüpbach; Thomas Dieterle; Jörg Daniel Leuppi; Arno Schmidt-Trucksäss; David Paul Wolfer; David Miedinger; Stefanie Brighenti-Zogg Journal: PLoS One Date: 2017-01-03 Impact factor: 3.240
Authors: Stefanie Brighenti-Zogg; Jonas Mundwiler; Ulla Schüpbach; Thomas Dieterle; David Paul Wolfer; Jörg Daniel Leuppi; David Miedinger Journal: PLoS One Date: 2016-05-02 Impact factor: 3.240