scholarly journals Effects of Unweighting on Gait Kinematics During Walking on a Lower-Body Positive-Pressure Treadmill in Patients with Hip Osteoarthritis

2020 ◽  
Author(s):  
Yoshiaki Kataoka ◽  
Tomohiro Shimizu ◽  
Ryo Takeda ◽  
Shigeru Tadano ◽  
Yuki Saito ◽  
...  
Keyword(s):  
Plantar Flexion ◽  
Hip Osteoarthritis ◽  
The Body ◽  
Lower Limbs ◽  
Positive Pressure ◽  
Control Group ◽  
Lower Body ◽  
Lower Body Positive Pressure ◽  
Gait Kinematics ◽  
Body Positive

Abstract Background: Hip osteoarthritis (OA) is a musculoskeletal condition that makes walking difficult due to pain induced by weight-bearing activities. Treadmills that support the body weight (BW) reduce the load on the lower limbs, and those equipped with a lower-body positive-pressure (LBPP) device, developed as a new method for unweighting, significantly reduce pain in patients with knee OA. However, the effects of unweighting on gait kinematics remain unclear in patients with hip OA. Therefore, we investigated the effects of unweighting on kinematics in patients with hip OA during walking on a treadmill equipped with an LBPP device.Methods: A total of 15 women with hip OA and 15 age-matched female controls wore a three-dimensional (3-D) motion analysis system and walked at a self-selected speed on the LBPP treadmill. Data regarding self-reported hip pain using a numeric rating scale (NRS) in which the scores 0 and 10 represented no pain and the worst pain, respectively, under three different BW conditions (100%, 75%, and 50%) were collected. Moreover, 3-D peak joint angles during gait under each condition were calculated and compared.Results: In the hip OA group, the NRS pain scores at 50% and 75% BW conditions significantly decreased compared with that at 100% BW condition (50%, P=0.002; 75%, P=0.026), and the peak hip extension angle decreased compared with that in the healthy controls (P=0.044). In both groups, unweighting significantly decreased the peak hip (P<0.001) and knee (P<0.001) flexion angles and increased the peak ankle plantar flexion angle (P<0.001) during walking.Conclusions: Unweighting by the LBPP treadmill decreased pain in the hip OA group but did not drastically alter the gait kinematics compared with that in the control group. Therefore, regarding the use of the LBPP treadmill for patients with hip OA, clinicians should consider the benefits of pain reduction rather than the kinematic changes.

scholarly journals Effects of unweighting on gait kinematics during walking on a lower-body positive-pressure treadmill in patients with hip osteoarthritis

2021 ◽  
Vol 22 (1) ◽  
Author(s):  
Yoshiaki Kataoka ◽  
Tomohiro Shimizu ◽  
Ryo Takeda ◽  
Shigeru Tadano ◽  
Yuki Saito ◽  
...  
Keyword(s):  
Plantar Flexion ◽  
Hip Osteoarthritis ◽  
The Body ◽  
Lower Limbs ◽  
Positive Pressure ◽  
Control Group ◽  
Lower Body ◽  
Lower Body Positive Pressure ◽  
Gait Kinematics ◽  
Body Positive

Abstract Background Hip osteoarthritis (OA) is a musculoskeletal condition that makes walking difficult due to pain induced by weight-bearing activities. Treadmills that support the body weight (BW) reduce the load on the lower limbs, and those equipped with a lower-body positive-pressure (LBPP) device, developed as a new method for unweighting, significantly reduce pain in patients with knee OA. However, the effects of unweighting on gait kinematics remain unclear in patients with hip OA. Therefore, we investigated the effects of unweighting on kinematics in patients with hip OA during walking on a treadmill equipped with an LBPP device. Methods A total of 15 women with hip OA and 15 age-matched female controls wore a three-dimensional (3-D) motion analysis system and walked at a self-selected speed on the LBPP treadmill. Data regarding self-reported hip pain using a numeric rating scale (NRS) in which the scores 0 and 10 represented no pain and the worst pain, respectively, under three different BW conditions (100, 75, and 50%) were collected. Moreover, 3-D peak joint angles during gait under each condition were calculated and compared. Results In the hip OA group, the NRS pain scores at 50 and 75% BW conditions significantly decreased compared with that at 100% BW condition (50%, P = 0.002; 75%, P = 0.026), and the peak hip extension angle decreased compared with that in the healthy controls (P = 0.044). In both groups, unweighting significantly decreased the peak hip (P < 0.001) and knee (P < 0.001) flexion angles and increased the peak ankle plantar flexion angle (P < 0.001) during walking. Conclusions Unweighting by the LBPP treadmill decreased pain in the hip OA group but did not drastically alter the gait kinematics compared with that in the control group. Therefore, regarding the use of the LBPP treadmill for patients with hip OA, clinicians should consider the benefits of pain reduction rather than the kinematic changes.

scholarly journals Effects of Unweighting on Gait Kinematics During Walking on a Lower-Body Positive-Pressure Treadmill in Patients with Hip Osteoarthritis

2021 ◽  
Author(s):  
Yoshiaki Kataoka ◽  
Tomohiro Shimizu ◽  
Ryo Takeda ◽  
Shigeru Tadano ◽  
Yuki Saito ◽  
...  
Keyword(s):  
Rating Scale ◽  
Plantar Flexion ◽  
Weight Bearing ◽  
Hip Osteoarthritis ◽  
The Body ◽  
Lower Limbs ◽  
Positive Pressure ◽  
Control Group ◽  
Lower Body ◽  
Gait Kinematics

Abstract Background: Hip osteoarthritis (OA) is a musculoskeletal condition that makes walking difficult due to pain induced by weight-bearing activities. Treadmills that support the body weight (BW) reduce the load on the lower limbs, and those equipped with a lower-body positive-pressure (LBPP) device, developed as a new method for unweighting, significantly reduce pain in patients with knee OA. However, the effects of unweighting on gait kinematics remain unclear in patients with hip OA. Therefore, we investigated the effects of unweighting on kinematics in patients with hip OA during walking on a treadmill equipped with an LBPP device. Methods: A total of 15 women with hip OA and 15 age-matched female controls wore a three-dimensional (3-D) motion analysis system and walked at a self-selected speed on the LBPP treadmill. Data regarding self-reported hip pain using a numeric rating scale (NRS) in which the scores 0 and 10 represented no pain and the worst pain, respectively, under three different BW conditions (100%, 75%, and 50%) were collected. Moreover, 3-D peak joint angles during gait under each condition were calculated and compared. Results: In the hip OA group, the NRS pain scores at 50% and 75% BW conditions significantly decreased compared with that at 100% BW condition (50%, P=0.002; 75%, P=0.026), and the peak hip extension angle decreased compared with that in the healthy controls (P=0.044). In both groups, unweighting significantly decreased the peak hip (P<0.001) and knee (P<0.001) flexion angles and increased the peak ankle plantar flexion angle (P<0.001) during walking. Conclusions: Unweighting by the LBPP treadmill decreased pain in the hip OA group but did not drastically alter the gait kinematics compared with that in the control group. Therefore, regarding the use of the LBPP treadmill for patients with hip OA, clinicians should consider the benefits of pain reduction rather than the kinematic changes.

scholarly journals Effects of Unweighting on Gait Kinematics During Walking on a Lower-Body Positive Pressure Treadmill in Patients with Hip Osteoarthritis

2020 ◽  
Author(s):  
Yoshiaki Kataoka ◽  
Tomohiro Shimizu ◽  
Ryo Takeda ◽  
Shigeru Tadano ◽  
Yuki Saito ◽  
...  
Keyword(s):  
Rating Scale ◽  
Weight Bearing ◽  
Three Dimensional ◽  
Hip Osteoarthritis ◽  
Lower Limbs ◽  
Positive Pressure ◽  
Lower Body ◽  
Lower Body Positive Pressure ◽  
Gait Kinematics ◽  
Body Positive

Abstract Background: Hip osteoarthritis (OA) is a musculoskeletal condition that makes walking difficult due to pain induced by weight-bearing activity. Treadmills that support body weight reduce the load on the lower limbs, and those equipped with a lower-body positive pressure (LBPP) device, developed as a new method for unweighting, significantly reduce pain in patients with knee OA. However, the effects of unweighting on gait kinematics remain unclear in patients with hip OA. Therefore, we investigated the effects of unweighting on kinematics in patients with hip OA during walking on a treadmill equipped with an LBPP device.Methods: Fifteen women with hip OA and fifteen age-matched female controls wore a three-dimensional motion analysis system and walked at a self-selected speed on the LBPP treadmill. Data regarding hip pain using a numeric rating scale under three different unweighting conditions (100%, 75%, and 50% bodyweight) were collected. Three-dimensional peak joint angles during gait under each condition were calculated and compared.Results: In the hip OA group, numerical rating scores at the unweighted conditions were significantly decreased compared to the 100% bodyweight condition, and peak hip extension angle decreased compared to the healthy controls. In both groups, unweighting significantly decreased the peak hip and knee flexion angle and increased the peak ankle plantarflexion angle during walking.Conclusions: Although unweighting by LBPP decreased pain in the hip OA group, gait kinematics did not alter despite less load on the hip joint. Therefore, clinicians should consider the benefits of pain reduction, rather than the alternation of gait kinematics, when considering LBPP treadmill for patients with hip OA.

scholarly journals Effects of Unweighting on Gait Kinematics During Walking on a Lower-Body Positive Pressure Treadmill in Patients with Hip Osteoarthritis

2020 ◽  
Author(s):  
Yoshiaki Kataoka ◽  
Tomohiro Shimizu ◽  
Ryo Takeda ◽  
Shigeru Tadano ◽  
Yuki Saito ◽  
...  
Keyword(s):  
Rating Scale ◽  
Sagittal Plane ◽  
Weight Bearing ◽  
Hip Osteoarthritis ◽  
Lower Limbs ◽  
Positive Pressure ◽  
Lower Body ◽  
Lower Body Positive Pressure ◽  
Gait Kinematics ◽  
Body Positive

Abstract Background: Hip osteoarthritis (OA) is a musculoskeletal condition that makes walking difficult due to pain induced by weight-bearing activity. Treadmills that support body weight reduce the load on the lower limbs, and those equipped with a lower-body positive pressure (LBPP) device, developed as a new method for unweighting, significantly reduce pain in patients with knee OA. However, the effects of unweighting on gait kinematics remain unclear in patients with hip OA. Therefore, we investigated the effects of unweighting on kinematics in patients with hip OA during walking on a treadmill equipped with an LBPP device.Methods: Fifteen women with hip OA and fifteen age-matched female controls wore a three-dimensional motion analysis system and walked at a comfortable speed on the LBPP treadmill. Data regarding hip pain using a numeric rating scale under three different unweighting conditions (100%, 75%, and 50% bodyweight) were collected. Sagittal plane lower-limb kinematics under each condition were calculated and compared.Results: In the hip OA group, numerical rating scores at the unweighted condition were significantly decreased compared to the 100% bodyweight condition, and sagittal kinematics in the hip and knee joints significantly decreased compared to the healthy controls. In both groups, unweighting significantly decreased the peak hip flexion angle and increased the peak ankle plantarflexion angle during walking.Conclusions: Although unweighting by LBPP decreased pain in the hip OA group, gait kinematics did not improve despite less load on the hip joint. Therefore, clinicians should consider the benefits of pain reduction, rather than improved gait, when considering LBPP treadmill for patients with hip OA.

scholarly journals Analysis of 3-D Kinematics Using H-Gait System during Walking on a Lower Body Positive Pressure Treadmill

Sensors ◽  
2021 ◽  
Vol 21 (8) ◽  
pp. 2619
Author(s):  
Yoshiaki Kataoka ◽  
Ryo Takeda ◽  
Shigeru Tadano ◽  
Tomoya Ishida ◽  
Yuki Saito ◽  
...  
Keyword(s):  
Motion Analysis ◽  
Wearable Sensors ◽  
Three Dimensional ◽  
Lower Limbs ◽  
Positive Pressure ◽  
Lower Body ◽  
Lower Body Positive Pressure ◽  
Gait Kinematics ◽  
Peak Knee ◽  
Body Positive

Recently, treadmills equipped with a lower-body positive-pressure (LBPP) device have been developed to provide precise body weight support (BWS) during walking. Since lower limbs are covered in a waist-high chamber of an LBPP treadmill, a conventional motion analysis using an optical method is impossible to evaluate gait kinematics on LBPP. We have developed a wearable-sensor-based three-dimensional motion analysis system, H-Gait. The purpose of the present study was to investigate the effects of BWS by a LBPP treadmill on gait kinematics using an H-Gait system. Twenty-five healthy subjects walked at 2.5 km/h on a LBPP treadmill under the following three conditions: (1) 0%BWS, (2) 25%BWS and (3) 50%BWS conditions. Acceleration and angular velocity from seven wearable sensors were used to analyze lower limb kinematics during walking. BWS significantly decreased peak angles of hip adduction, knee adduction and ankle dorsiflexion. In particular, the peak knee adduction angle at the 50%BWS significantly decreased compared to at the 25%BWS (p = 0.012) or 0%BWS (p < 0.001). The present study showed that H-Gait system can detect the changes in gait kinematics in response to BWS by a LBPP treadmill and provided a useful clinical application of the H-Gait system to walking exercises.

scholarly journals Effects of posture on cardiovascular responses to lower body positive pressure at rest and during dynamic exercise

1998 ◽  
Vol 85 (1) ◽  
pp. 160-167 ◽  
Author(s):  
Takeshi Nishiyasu ◽  
Kei Nagashima ◽  
Ethan R. Nadel ◽  
Gary W. Mack
Keyword(s):  
Body Position ◽  
Cardiovascular Responses ◽  
Dynamic Exercise ◽  
The Body ◽  
Positive Pressure ◽  
Lower Body ◽  
Lower Body Positive Pressure ◽  
Arterial Blood ◽  
Ergometer Exercise ◽  
Body Positive

We tested the hypothesis that cardiovascular responses to lower body positive pressure (LBPP) would be dependent on the posture of the subject and also on the background condition (rest or exercise). We measured heart rate (HR), mean arterial blood pressure (MAP), and cardiac stroke volume in eight subjects at rest and during cycle ergometer exercise (76 ± 3 W) with and without LBPP (25, 50, and 75 mmHg) in the supine and upright positions. At rest, the increase in MAP was proportional to the increase in LBPP and was greater in the supine (6 ± 2, 15 ± 3, and 26 ± 3 mmHg) than in the upright (2 ± 3, 9 ± 3, and 17 ± 3 mmHg) position. During dynamic exercise, the increases in MAP evoked by 25, 50, and 75 mmHg LBPP were greater in the supine (13 ± 2, 28 ± 3, and 40 ± 3 mmHg) than in the upright (7 ± 3, 12 ± 3, and 25 ± 3 mmHg) position. We conclude that the systemic pressure response to LBPP is clearly dependent on the body position, with the larger pressure responses being associated with the supine position both at rest and during dynamic leg exercise.

scholarly journals Effect of Uphill Running on VO2, Heart Rate and Lactate Accumulation on Lower Body Positive Pressure Treadmills

Sports ◽  
2021 ◽  
Vol 9 (4) ◽  
pp. 51
Author(s):  
Daniel Fleckenstein ◽  
Olaf Ueberschär ◽  
Jan C. Wüstenfeld ◽  
Peter Rüdrich ◽  
Bernd Wolfarth
Keyword(s):  
Heart Rate ◽  
Body Weight ◽  
Body Weight Support ◽  
Positive Pressure ◽  
Lower Body ◽  
Lactate Accumulation ◽  
Biomechanical Stress ◽  
Lower Body Positive Pressure ◽  
Weight Support ◽  
Body Positive

Lower body positive pressure treadmills (LBPPTs) as a strategy to reduce musculoskeletal load are becoming more common as part of sports conditioning, although the requisite physiological parameters are unclear. To elucidate their role, ten well-trained runners (30.2 ± 3.4 years; VO2max: 60.3 ± 4.2 mL kg−1 min−1) ran at 70% of their individual velocity at VO2max (vVO2max) on a LBPPT at 80% body weight support (80% BWSet) and 90% body weight support (90% BWSet), at 0%, 2% and 7% incline. Oxygen consumption (VO2), heart rate (HR) and blood lactate accumulation (LA) were monitored. It was found that an increase in incline led to increased VO2 values of 6.8 ± 0.8 mL kg−1 min−1 (0% vs. 7%, p < 0.001) and 5.4 ± 0.8 mL kg−1 min−1 (2% vs. 7%, p < 0.001). Between 80% BWSet and 90% BWSet, there were VO2 differences of 3.3 ± 0.2 mL kg−1 min−1 (p < 0.001). HR increased with incline by 12 ± 2 bpm (0% vs. 7%, p < 0.05) and 10 ± 2 bpm (2% vs. 7%, p < 0.05). From 80% BWSet to 90% BWSet, HR increases of 6 ± 1 bpm (p < 0.001) were observed. Additionally, LA values showed differences of 0.10 ± 0.02 mmol l−1 between 80% BWSet and 90% BWSet. Those results suggest that on a LBPPT, a 2% incline (at 70% vVO2max) is not yet sufficient to produce significant physiological changes in VO2, HR and LA—as opposed to running on conventional treadmills, where significant changes are measured. However, a 7% incline increases VO2 and HR significantly. Bringing together physiological and biomechanical factors from previous studies into this practical context, it appears that a 7% incline (at 80% BWSet) may be used to keep VO2 and HR load unchanged as compared to unsupported running, while biomechanical stress is substantially reduced.

Hemodynamic and hormonal effects of prolonged anti-G suit inflation in humans

1992 ◽  
Vol 72 (3) ◽  
pp. 977-984 ◽  
Author(s):  
G. Geelen ◽  
P. Arbeille ◽  
J. L. Saumet ◽  
J. M. Cottet-Emard ◽  
F. Patat ◽  
...  
Keyword(s):  
Cardiac Output ◽  
Plasma Renin Activity ◽  
Plasma Renin ◽  
Left Ventricular ◽  
Renin Activity ◽  
Positive Pressure ◽  
Plasma Norepinephrine ◽  
Lower Body ◽  
Lower Body Positive Pressure ◽  
Body Positive

This study examined the hemodynamic consequences of prolonged lower body positive-pressure application and their relationship to changes in the plasma concentration of the major vasoactive hormones. Six men [36 +/- 2 (SE) yr] underwent 30 min of sitting and then 3 h of 70 degrees head-up tilt. An antigravity suit was applied (60 Torr legs, 30 Torr abdomen) during the last 2 h of tilt. In a similar noninflation experiment, the endocrine responses were measured in the suited subjects tilted for 3 h. Two-dimensional echocardiography was used to calculate ventricular volume and cardiac output. Measurements were made 30 min before and 30 and 90 min after inflation. Immediately after inflation, mean arterial pressure increased by 7 +/- 2 Torr and heart rate decreased by 16 +/- 4 beats/min. Left ventricular end-diastolic volume and systolic volume increased significantly (P less than 0.05) at 30 and 90 min of inflation. Cardiac output increased after 30 min of inflation and returned to the preinflation level at 90 min. Plasma norepinephrine and plasma renin activity were maximally suppressed after 15 and 90 min of inflation, respectively (P less than 0.05). No such hormonal changes occurred during control. Plasma sodium, potassium, and osmolality remained unchanged during both experiments. Thus, prolonged application of lower body positive pressure induces 1) a transient increase in cardiac output and 2) a marked and sustained decrease in plasma norepinephrine and plasma renin activity, which reflect an inflation-induced decrease in sympathetic activity.

Sign in / Sign up

Export Citation Format

Share Document