Table 2.
Work shift context, physiological workload (based on heart rate) for burnt cane cutters (BCC) and seed cutters (SC) before (Harvest 2; H2) and after (Harvest 3; H3) implementation of an enhanced intervention. [%HRmax=percentage of maximal heart rate; CI= confidence interval.]
| Work shift duration | Rest periods | Work periods | Average %HRmax work + rest periods | Average %HRmax work periods | ||||
|---|---|---|---|---|---|---|---|---|
|
|
|
|
|
|
||||
| Mean (95% CI) | Mean (95% CI) | Mean (95% CI) | Mean (95% CI) | Mean (95% CI) | ||||
|
|
|
|
|
|
||||
| Hours | N | Minutes | N | Minutes | % | % | ||
| BCC | H2 (N=12) | 05:46 (05:26–06:06) | 4 (3–4) | 13 (12–15) | 5 (4–5) | 50 (47–53) | 63 (60–65) | 68 (65–71) |
| H3 (N=40) | 05:38 (05:31–05:45) | 5 (5–5) | 14 (13–15) | 6 (6–6) | 40 (39–42) | 58 (56–60) | 64 (62–65) | |
| SCa | H2 (N=13) | 05:42 (05:20–06:04) | 3 (3–4) | 9 (7–10) | 4 (4–5) | 67 (58–75) | 60 (57–64) | 63 (60–66) |
| H3 (N=58) | 05:42a (05:36–05:48) | 5 (5–5) | 12 (12–13) | 6 (6–6) | 47 (46–48) | 60 (59–62) | 63 (62–65) | |
a To account for shorter work shift (ending ~midday) for SC in H2, H3 data were only examined up to the 12:00 hour rest period for between harvest comparisons.