Comparison of Trunk Muscle Activities and Spinal Curvature when Sitting on a Kneeling Chair and Sitting on a Conventional Chair -Investigation of Two Sitting Postures-

Suzuki, Tetsu; Hirata, Junya; Ohtsuki, Keisuke; Watanabe, Susumu

doi:10.1589/rika.26.263

Cited by 2 publications

(2 citation statements)

References 24 publications

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“…By tilting the seat surface forward, the forward tilt moment acts on the pelvis and pelvis backward tilt moment is decreased by the muscle group of the posterior thigh, including the hamstrings. Activities of these muscles have been reported to decrease in a sitting position with forward tilt on a forward tilting seat surface compared to a normal seat surface 11) . In addition, during one-leg propulsion of a wheelchair, the lateral hamstring acts as the forward propulsive force through the flexion of the knee and as a force exerting pressure on the foot with extension of the hip 2) .…”

Section: Discussionmentioning

confidence: 99%

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Effects of Forward Tilt of the Seat Surface on Trunk and Lower Limb Muscle Activity during One-leg Wheelchair Propulsion

2012

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Abstract. [Purpose] To investigate the effects of forward tilt of the seat surface on the efficiency of wheelchair one-leg propulsion.[Subjects] Subjects were 10 healthy adults (4 men, 6 women; mean age, 27.7 ± 6.1 years; height, 166.8 ± 6.5 cm; weight, 57.9 ± 12.2 kg). [Method] This study investigated the effects of forward tilt of the seat surface (0° or 10°) on the efficiency of one-leg propulsion, based on muscle activity of the rectus abdominis, internal oblique, lumbar erector spinae, lumbar multifidus, hamstring and external oblique muscles when propelling a wheelchair at 1 m/s, and the time taken to travel 10 m using one-leg propulsion at maximum effort.[Result] Time taken to travel 10 m at maximum effort was significantly shorter with forward tilt than without. Muscle activity of all the muscles except the external oblique was significantly lower with forward tilt than without.[Conclusion] Tilting the wheelchair seat forward may be useful during one-leg wheelchair propulsion for individuals with decreased ability to tilt the pelvis forward.

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Section: Discussionmentioning

confidence: 99%

“…With reference to the study of Suzuki et al 11) , muscle activity of the trunk and lower limbs was measured using surface electromyography (Vital Recorder 2; Kissei Comtec, Japan). The bandpass filter was set at 10-500 Hz, and the sampling frequency at 1,000 Hz.…”

Section: Methodsmentioning

confidence: 99%

Effects of Forward Tilt of the Seat Surface on Trunk and Lower Limb Muscle Activity during One-leg Wheelchair Propulsion

2012

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A Kinematic Comparison of Healthy Adults’ Resting Seated Position and Posture Adjustments during Movement on Half-Forward-Sloped Seat, Forward-Sloped Seat, and Standard Seat Surfaces

et al. 2023

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The aim of this research was to investigate the effects of three seat shapes -a standard seat with a 5° backward tilt, a seat with a 15° forward tilt, and a half-sloped seat shape (HS) with a forward-tilted front and the same angle as the standard seat at the back -on the sitting posture and trunk and lower limb muscle activities during quiet sitting and upper limb movements. [Participants and Methods] Twelve healthy adults were included in the study. We compared the number of movements during upper limb exercises (moving a water bottle back and forth and side to side with the dominant hand) during quiet sitting in the three seat shapes (standard, forward tilt, and HS), as well as the changes in the angle of the hip joint and the distance between the outside of the thigh bone and the edge of the seat. We also compared the muscle activities of the anterior deltoid, upper trapezius, external oblique, erector spinae, rectus femoris, vastus lateralis, and peroneus longus muscles as measured by surface electromyography.[Results] The HS seat resulted in less extension of the distance between the outside of the thigh bone and the edge of the seat than the standard seat, and less muscle activity in the right rectus femoris, left vastus lateralis, and right peroneus longus muscles than the forward tilt seat. [Conclusion] The results suggest that the HS seat can contribute to maintaining a posture suitable for activities.

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Comparison of Trunk Muscle Activities and Spinal Curvature when Sitting on a Kneeling Chair and Sitting on a Conventional Chair -Investigation of Two Sitting Postures-

Cited by 2 publications

References 24 publications

Effects of Forward Tilt of the Seat Surface on Trunk and Lower Limb Muscle Activity during One-leg Wheelchair Propulsion

Effects of Forward Tilt of the Seat Surface on Trunk and Lower Limb Muscle Activity during One-leg Wheelchair Propulsion

A Kinematic Comparison of Healthy Adults’ Resting Seated Position and Posture Adjustments during Movement on Half-Forward-Sloped Seat, Forward-Sloped Seat, and Standard Seat Surfaces

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