for high occurrences of upper extremity disorders in working populations and in order to compare the occurrence of musculoskeletal alterations due to ergonomic risk factors such as highly force exertion, repetition, awkward posture between exposed and non-exposed groups, the research was carried out in tabarestan steel industry. all 526 male workers (316 as exposed group : 132 aged 20-35 years,...

The human hand is a very useful multipurpose tool in all environments. However, performance capabilities are compromised considerably when gloves are donned. This is especially true for extra-vehicular activity (EVA) gloves used in a space environment. The primary aim of this study was to establish exertion and endurance limits for specific tasks. The objective of this study was to develop grip...

Force exertion is related to low back injuries (LBI). This paper critically reviews the literature concerning cut-points for back force exertion, presents available guidelines in a concise manner, and identifies areas that need further research. The studies reviewed were grouped according to the criteria used to set the cut-point values. Most often cut-points differ than concur. The approach co...

Endurance performance involves the prolonged maintenance of constant or self-regulated power/velocity or torque/force. While the impact of numerous determinants of endurance performance has been previously reviewed, the impact of fatigue on subsequent endurance performance still needs to be documented. This review aims to present the impact of fatigue induced by physical or mental exertion on s...

In pushing and pulling wheeled carts, the direction of force exertion may, beside the force magnitude, considerably affect musculoskeletal loading. This paper describes how force direction changes as handle height and force level change, and the effects this has on the loads on the shoulder and low back. Eight subjects pushed against or pulled on a stationary bar or movable cart at various hand...

〔目的〕有酸素性運動および筋力発揮調整能の課題を併用したトレーニングが及ぼす影響を検討した．〔対象と方法〕健常成人16名であり60％VO2 maxで10分間の自転車こぎ運動後に筋力発揮調整能の課題を実施するAE群（n＝8），筋力発揮調整能の課題のみを行うCON群（n＝8）に無作為に振り分けた．筋力発揮調整能の課題として，握力課題を実施し，頻度は週3回，4週間とした．握力課題の成功数および課題遂行時間を，トレーニング前・後に測定した．〔結果〕握力課題の成功数は，AE群でトレーニング前と比較してトレーニング後に有意な増加が認められたが，CON群では有意差は認められなかった．〔結語〕有酸素性運動および筋力発揮調整能の課題を併用したトレーニングが，筋力発揮調整能を促進させる可能性が示唆された．