Estimation of Human Lower-Extremity Muscle Force Under Uncertainty While Rising from a Chair

Jo, Young Nam; Kang, Moon Jeong; Chae, Je Wook; Yoo, Hong Hee

doi:10.3795/ksme-a.2014.38.10.1147

Cited by 1 publication

(3 citation statements)

References 15 publications

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“…The PA refers to the angle between a muscle and a tendon, and the angle varies according to the length of each muscle. 32 This study applied for a short period of intervention. Significant changes in PA were considered insufficient because of a small amount of structural change.…”

Section: Discussionmentioning

confidence: 99%

“…6 Conversely, FR directly and extensively exerts pressure on the soft tissue, thereby stretching the tissue and causing friction. 32 The increase in flexibility after FR can be explained by using the property that the fascia hardens when it is still and softens as it moves. 34,35 In comparison with the control group in this study, the reason for the significant difference in PA that was observed only in the FR group was that the fascia was softened and the tissue increased due to the friction generated during FR, thereby reducing PA.…”

Section: Discussionmentioning

confidence: 99%

“…6 The PA is a specific angle between the muscle and tendon, which depends on the fascial arrangement and muscle length. 7 Increasing muscle means increased flexibility. 8 Previous studies have established that a relationship exists between the fascial length and PA as a study reported that PA decreases as the fascial length increases.…”

Section: Introductionmentioning

confidence: 99%

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Immediate Effects of Foam Rolling and Proprioceptive Neuromuscular Facilitation Stretching on Hamstring Flexibility

Choi

Lee

et al. 2022

J Kor Phys Ther

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Purpose: This study aimed to determine which interventions are effective in increasing hamstring flexibility due to changes in the range of motion (ROM) and pennation angle (PA) when foam rolling (FR) and proprioceptive neuromuscular facilitation (PNF) stretching were performed. Methods: A total of 24 healthy participants who agreed to participate in the study were randomly chosen. The participants were divided into three groups of eight people: Control, FR, and PNF stretching groups. The hip flexion angle (ROM) and PA of the hamstrings were measured before and after the experiment. The Wilcoxon signed-rank test was used to analyze the ROM and PA for each group by comparing the before and after results. The Kruskal-Wallis test and the Mann-Whitney U test were used to analyze the increase in hamstring flexibility between the groups. Results: A statistically significant difference was observed in the ROM and PA within all groups, and only the ROM was significant in the comparison between the three groups. In the comparison between the control and other two groups, a significant difference was noted in both the ROM and PA in the FR group and only the ROM in the PNF stretching group (p< 0.05). In the comparison between the FR and PNF stretching groups, no significant difference was observed (p> 0.05). Conclusion: These findings FR and PNF stretching increased the ROM; however, no change in PA was observed. Therefore, FR and PNF stretching were considered effective interventions in immediately increasing hamstring flexibility.

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Section: Discussionmentioning

confidence: 99%