In the case at bar, a reasonable connection between the respondents injuries and the nature of his job has been established.Thus, as in the above cited case, it is safe to presume that the arduous nature of the respondents job caused the respondents illness or at least aggravated any pre-existing condition he might have had, and is thus work-related.   The earlier-quoted findings of respondents physician indicate that repeated trauma such as excessive and strenuous physical activities may play a role in producing back stress, more injuries and disability, hence, his advice for respondent to refrain from activities producing torsional stress on the back and those that require repetitive bending and lifting as he is UNFIT to resume his sea duties.   Petitioners physician herself stated that among the causes of respondents conditions are trauma, biomechanical stress, and repeated motion on a joint. [41]  Her observation that there was no overt and direct assault or physical injury that may have contributed to the MRI findings of Mr. Talaveras lumbar spine[42] and petitioners argument that no record of an accident was presented[43] do not persuade. As respondents physician explained, A single episode of trauma may not initially be significant, but repeated trauma, such as excessive and strenuous physical activities may play a role.[44]   In their Reply[45] to respondents Position Paper, petitioners did not contest or disprove respondents claim that prior to June 2003, he had concluded three contracts with them and that every time he was scheduled for deployment, he was subjected to medical examination by petitioners designated physician and had always been declared fit to work.[46] Petitioners failed too to refute, respondents following claims:   Complainant Talavera as Fitter performed repair and maintenance works, like hydraulic line return and other supply lines of the vessel; he did all the welding works and assist[ed] the First and Second Engineer during overhauling works of generators, engines and others [sic] engineering works as directed by lifting, carrying, pushing, pulling and moving heavy equipment and materials and constantly performed overtime works because the ship was old and always repair jobs are almost anywhere inside the vessel. He found himself with very few hours rest period.   On several occasions due to his excessive arduous and stressful, both physical and mental works, he felt slight pains in his back and other parts of his body, [b]ut ignored the same due to the demands of his works and because