Relationship between heart rate and oxygen uptake in thoracic level paraplegics

Bar-On, Z; Nene, A.V.

doi:10.1038/sc.1990.11

Cited by 28 publications

(23 citation statements)

References 7 publications

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“…27 ± 32 In fact, Irizawa et al 33 demonstrated that, during arm crank exercise, the higher the level of the SCI lesion, the higher the HR at a given VO 2 . The HR response to increased VO 2 during CFES LE was less dramatic in our subjects compared to the results of Bar-On et al, 26 which con®rm the di culties in using HR as a measure of intensity during upper body exercise in the SCI individual. Our ®ndings are meaningful in that the subjects demonstrated a relationship between exercise intensity induced by arti®cial stimulation and an increase in HR, that this relationship was more consistent after training, and was retained following DT.…”

Section: Discussionsupporting

confidence: 50%

“…Bar-On et al 26 reported that the HR-VO 2 relationship is linear for both paraplegic and quadriplegic subjects during arm ergometry. However, their data cannot be compared to HR-VO 2 changes during CFES LE by the SCI individual given the variable magnitude of peripheral pooling of blood and resulting impairment to venous return during upper body exercise in the SCI individual.…”

Section: Discussionmentioning

confidence: 99%

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Detraining from total body exercise ergometry in individuals with spinal cord injury

et al. 1998

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This study was designed to investigate the e ects of detraining that occurred during an 8 week period of muscular inactivity following a 12 week training program of arti®cial computerized functional electrical stimulation cycle ergometry (CFES LE) and arm ergometry. Six spinal cord injured male individuals were followed through an 8 week detraining period that was preceded by a 12 week exercise program including CFES LE and arm ergometry. Maximal graded exercise tests were completed and measurements of peak oxygen consumption (VO 2 ), heart rate (HR), ventilation (V E ) workload, and creatine kinase were taken. Testing occurred at initial training (0T), after 12 weeks of training (12T), and after 8 weeks of detraining (DT). After the training program, peak VO 2 increased signi®cantly from 0.562+0.126 (0T) to 1.021+0.247 l/min (12T, P50.05). After DT, peak VO 2 decreased to 0.791=0.216 l/min, which was lower than 12T (P50.05), yet higher than 0T (P50.05). After DT, peak workoad had decreased from 0.675+0.203 (12T) to 0.32+0.203 kp (P50.05), which was not di erent than 0T. Creatine kinase levels were signi®cantly lower both at 12T and DT compared to OT (P50.05). In addition, this training program induced linear increases in both VO 2 and HR with workload, which were retained after DT. These increases did not reach statistical signi®cance, however. No apparent relationship existed between these values at baseline. There were no signi®cant di erences in submaximal or peak HR of V E between the three testing periods. The results indicate that both peripheral muscular adaptations and central distribution adaptations in SCI individuals are partially maintained following 8 weeks of DT from CFES LE and arm ergometry.

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Section: Discussionsupporting

confidence: 50%

Section: Discussionmentioning

confidence: 99%

Detraining from total body exercise ergometry in individuals with spinal cord injury

et al. 1998

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“…The excluded subject had a higher energy consumption with a low heart rate, probably due to the damage of the spinal centre of sympathetic regulation of heart, according with the observation of Bar-On and Nene. 23 The high level of heart rate of subjects walking with ARGO indicates a considerable e ort and can be explained considering that normally at a comparable oxygen uptake the heart rate is greater in arm work than in leg work. 24 Also paraplegics performing a graded arm exercise show an unusually low increase of stroke volume.…”

Section: Discussionmentioning

confidence: 99%

Walking with the Advanced Reciprocating Gait Orthosis (ARGO) in thoracic paraplegic patients: energy expenditure and cardiorespiratory performance

Massucci¹,

Brunetti²,

Piperno

et al. 1998

Spinal Cord

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The aim of this study was to quantify the energy cost and the cardiorespiratory response while walking at free speed with an Advanced Reciprocating Gait Orthosis (ARGO). The study was conducted on a group of six male paraplegic patients, age range 16 ± 31 years (median = 22.50), with complete traumatic injuries ranging from T3 to T12 and a median time lapse from the trauma of 21 months. The data was recorded 6 ± 8 weeks after the patients were ®tted and trained to use the orthosis. Maintaining a standing position produced a signi®cant increase of both the heart rate (HR) and the respiratory rate (RR), whilst the increase of energy consumption was not signi®cant. The data for median speed, energy consumption and energy cost observed during free walking was similar to that of the Reciprocating Gait Orthosis (RGO) in thoracic level paraplegic individuals. This study indicates that in the utilisation of the ARGO the workload is not excessive when it is limited to maintaining a standing position. In contrast, walking results in early anaerobic conditions and unsustainable fatigue after short distances. The great energy cost recorded is considered to be a main reason for the frequent abandonment or the low utilisation of the orthosis at follow-up.

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“…[2][3][4] The guidelines of the American College of Sports Medicine (ACSM) for training of able-bodied persons -50-85% heart rate reserve (HRR) 5 -have also been applied in training studies with persons with paraplegia (PP) 6 as well as tetraplegia (TP). 7,8 These guidelines may be valid for persons with PP, as several studies [9][10][11][12][13][14] showed a strong individual linear HR-VO 2 relationship in persons with PP. In individuals with TP however, this may be different as a result of the disturbed sympathetic innervation, which may affect the HR-VO 2 relationship.…”

Section: Introductionmentioning

confidence: 99%

“…9,10,12,14 Moreover, only a few studies have focused on the HR-VO 2 relationship in persons with TP 13,20,21 and only one focused on the individual relationship. 20 The available studies all use hand rim wheelchair or arm crank exercise to investigate the HR-VO 2 relationship.…”

Section: Introductionmentioning

confidence: 99%

The individual relationship between heart rate and oxygen uptake in people with a tetraplegia during exercise

et al. 2006

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Study design: Descriptive study. Objective: To examine the individual heart rate-oxygen uptake (HR-VO 2 ) relationship during exercise in persons with tetraplegia (TP). Setting: Rehabilitation Centre Heliomare, Wijk aan Zee, The Netherlands. Methods: The HR-VO 2 relationship was determined in untrained subjects with motor complete TP (C5 or C6, n ¼ 10 and C7 or C8, n ¼ 10) during a discontinuous graded exercise hand cycle test. The mean HR and VO 2 of the final 60 s of 2-min exercise blocks were used for calculation of the individual correlation coefficient and the standard error of the estimate (SEE). Results: Two subjects of the C5-C6 group were not able to complete the test. Individual Pearson's correlation coefficients (r) ranged from 0.68 to 0.97 and SEE from 2.6 to 22.4% VO 2 -Reserve (VO 2 R). The mean Pearson's r and SEE were 0.8170.12 and 10.675.6% VO 2 R in the C5-C6 group and 0.9170.07 and 7.073.2% VO 2 R in the C7-C8 group, respectively. Two subjects of the C5-C6 group and six subjects of the C7-C8 group attained a linear HR-VO 2 relationship with an acceptable SEE (p6.0%) and r (40.90). Conclusions: The HR-VO 2 relationship appeared linear in only eight out of 18 subjects. An individual analysis of the HR-VO 2 relationship is necessary to determine whether HR can be used to quantify exercise intensity. The use of HR to prescribe training intensity should be reconsidered in persons with TP. Sponsorship: This study is supported from a grant by ZON-MW.

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Relationship between heart rate and oxygen uptake in thoracic level paraplegics

Cited by 28 publications

References 7 publications

Detraining from total body exercise ergometry in individuals with spinal cord injury

Detraining from total body exercise ergometry in individuals with spinal cord injury

Walking with the Advanced Reciprocating Gait Orthosis (ARGO) in thoracic paraplegic patients: energy expenditure and cardiorespiratory performance

The individual relationship between heart rate and oxygen uptake in people with a tetraplegia during exercise

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