China
Africa
Explore chapters and articles related to this topic
Biological Monitoring: Neurophysiological and Behavioral Assessments
Published in Donald J. Ecobichon, Occupational Hazards of Pesticide Exposure, 2020
Motor neurons. Using the ulnar nerve for velocity studies, the active recording electrode is placed over the belly of the abductor digiti minimi muscle and the indifferent electrode is placed over the fifth metacarpophalangeal joint (Stalberg et al. 1978). The change in the amplitude of the compound nerve action potential is measured with pad electrodes on both sides of the sulcus ulnaris when the ulnar nerve is stimulated at the wrist.
The length of tibialis anterior does not influence force steadiness during submaximal isometric contractions with the dorsiflexors
Published in European Journal of Sport Science, 2022
Eirini Tsatsaki, Ioannis G. Amiridis, Ales Holobar, Georgios Trypidakis, Fotini Arabatzi, Eleftherios Kellis, Roger M. Enoka
However, one significant difference between our results and those of Dideriksen et al. (2012) was the magnitude of the correlation coefficients. They reported peak correlation coefficients of ∼0.75, which were greater than our maximal values of ∼0.45. One likely explanation for this difference is that our dorsiflexion task involved several synergistic muscles, such as extensor hallucis longus, extensor digitorum longus, and peroneus tertius, whereas Dideriksen et al. (2012) studied an isolated hand muscle (abductor digiti minimi). These findings indicate that although the fluctuations in muscle force during steady isometric contractions are strongly associated with the variability in motor unit discharge times, the association for an individual muscle is weakened when multiple muscles are involved in the action.
Occupational ergonomic assessment of hand pain symptoms among Bagh hand block print artisans of the handicraft textile industry in Madhya Pradesh, India
Published in International Journal of Occupational Safety and Ergonomics, 2022
Rajat Kamble, Avinash Sahu, Sangeeta Pandit
The study investigated the prevalence of hand pain symptomseverity among the artisans in correlation with different demographic and work-related factors. It was found that every artisan reported at least one hand pain symptom in the palm’s abductor digiti minimi region, resulting from repeated hitting on the wooden hand block. This finding is consistent with previous studies involving WRMSDs and repetitive manual work [3,5,6,9,22–24], where the majority of the workers reported high rates of MSDs and pain, and reported that the combination of force and repetitive movement places workers at risk for musculoskeletal problems in the hand/wrist area. Of all the symptoms, a majority of artisans reported pain during the working hours (S1), numbness (S3), weakness (S4) and tingling (S5) in the abductor digiti minimi region of the palm. From the FFS it was found that the artisans faced more difficulty working with larger blocks than the other blocks. The reason could be due to repeated hitting by the ulnar side of the palm with more force with the presence of hand problems as seen from the SSS and CEMT. Artisans also reported difficulty maintaining good productivity, being regular at work and doing necessary work that involved wrist motion and force. The present study found that the artisans had developed callosity, lichenification and skin hardening due to repeated mechanical trauma on the palm’s abductor digiti minimi region. This is similar to the previous studies of CEMT to the skin that reported various skin changes, i.e., calluses, corns and other hyperkeratosis, and pigment changes, caused by chronic skin exposure to small repeated mechanical insults [25].
Comparison of foot posture and foot muscle morphology between lifesaver athletes and healthy adults
Published in Research in Sports Medicine, 2023
Shota Ichikawa, Tsukasa Kumai, Takumi Okunuki, Toshihiro Maemichi, Masatomo Matsumoto, Hiroki Yabiku, Zijian Liu, Ryusei Yamaguchi, Arina Iwayama, Goro Ayukawa, Yui Akiyama, Hiroyuki Mitsui, Hisateru Niki
The extrinsic muscles and abductor hallucis were measured by placing the US probe on the skin, and the other intrinsic muscles (abductor digiti minimi, flexor hallucis brevis, flexor digitorum brevis) were measured from the surface of the sole through the polymethylpentene tank. Measuring from the surface of the sole of the foot allowed us to examine the change in the cross-sectional area of the intrinsic muscles when a load was applied. To prevent pressure on the tissues, the pressure from the US probe was kept to a minimum, and US gel was applied to the skin and probe for all measurements.