Publications by authors named "Nai-Hao Yin"
Article Synopsis
- The study investigates neck pain linked to helmet-wear in helicopter pilots, focusing on differences between male and female aircrew in terms of neuromuscular activation.
- In Phase A, female participants showed higher muscle activity than males while wearing a helmet, but both sexes benefited from a Helmet Balancing System (HBS) that reduced muscle strain.
- Phase B revealed that females experienced greater muscle fatigue after 45 minutes of helmet wear, while males had a significant decrease in cervical disc height, highlighting the need for tailored approaches to address sex-specific neck pain issues in aircrew.
Objective: Restricted tendon gliding is commonly observed in patients after finger flexor tendon (FFT) repair. The study described here was aimed at quantifying the amount of FFT gliding to evaluate the recovery of post-operative tendons using a 2-D radiofrequency (RF)-based ultrasound speckle tracking algorithm (UST).
Methods: Ex vivo uniaxial tensile testing of porcine flexor tendons and in vivo isometric testing of human FFT were implemented to verify the efficacy of UST beforehand.
The purpose of this study is to determine whether age-related changes to tendon matrix molecules can be detected using Raman spectroscopy. Raman spectra were collected from human Achilles (n = 8) and tibialis anterior (n = 8) tendon tissue excised from young (17 ± 3 years) and old (72 ± 7 years) age groups. Normalised Raman spectra underwent principal component analysis (PCA), to objectively identify differences between age groups and tendon types.
View Article and Find Full Text PDFArticle Synopsis
- The human Achilles tendon consists of three sub-tendons and shows variable internal movements that decrease with age and injury, possibly contributing to tendon disorders.
- The equine deep digital flexor tendon (DDFT) and its accessory ligament (AL) serve as a suitable model for examining these sliding behaviors due to similarities in structure and injury patterns.
- Mechanical testing on equine tendons revealed significant strain differences between the DDFT and AL, suggesting that force transmission is greater from the AL to the DDFT, which can help in understanding the mechanics of human Achilles tendon injuries.
The unique structure of the Achilles tendon, combining three smaller sub-tendons, enhances movement efficiency by allowing individual control from connected muscles. This requires compliant interfaces between sub-tendons, but compliance decreases with age and may account for increased injury frequency. Current understanding of sub-tendon sliding and its role in the whole Achilles tendon function is limited.
View Article and Find Full Text PDFThe lack of clinical detection tools at the molecular level hinders our progression in preventing age-related tendon pathologies. Raman spectroscopy can rapidly and non-invasively detect tissue molecular compositions and has great potential for in vivo applications. In biological tissues, a highly fluorescent background masks the Raman spectral features and is usually removed during data processing, but including this background could help age differentiation since fluorescence level in tendons increases with age.
View Article and Find Full Text PDFStudy Design: Controlled laboratory study.
Objectives: To measure and compare patellar tendon stiffness and microcirculation in college tennis players and nonathletic students when performing eccentric knee extension exercises that do and do not reduce tendon stiffness.
Background: Previous studies suggest that tendon microcirculation response during exercises may vary based on the tendon's plastic properties.