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Effect of Manual Wheelchair Propulsion Workload on Speed, Energy Expenditure, and Propulsion Mechanics

22. februar 2022 opdateret af: Rachel Cowan, University of Alabama at Birmingham

Relationship Among Manual Wheelchair Workload, Speed, Energy Expenditure, and Propulsion Mechanics

The first purpose of this study is to characterize the relationship among propulsion workload, self-selected propulsion speed, and propulsion kinetics/kinematics.

The second purpose is to assess the between days repeatability/reliability of the above outcomes.

There are no hypothesis

This is a repeated measures clinical trial. All participants will complete the following: 1) Acclimation to propelling a manual wheelchair on a wheelchair ergometer; 2) Graded exercise test on the wheelchair ergometer to 80% of age adjusted estimated maximal heart rate; and 3) N=20 one minute propulsion bouts on the wheelchair ergometer.

Studieoversigt

Status

Afsluttet

Betingelser

Intervention / Behandling

Detaljeret beskrivelse

Participants will complete two visits in a 14 day period. Visit 1 will require 3-4 hours. Visit 2 will require 2-3 hours.

During visit 1 participant will complete: 1) Acclimation to propelling a manual wheelchair on a wheelchair ergometer; 2) Graded exercise test on the wheelchair ergometer to 80% of age adjusted estimated maximal heart rate; and 3) N=20 one minute propulsion bouts on the wheelchair ergometer.

During visit 2 participants will repeat the N=20 one minute propulsion bouts on the wheelchair ergometer.

Wheelchair ergometer propulsion acclimation: Participants will complete a minimum of 2 minutes of wheelchair propulsion to acclimate. Additional propulsion time will be completed as needed. Propulsion workload will be varied during the acclimation. Acclimation propulsion may be repeated as needed during study participation.

Submaximal wheelchair ergometer test protocol: Participants will rest quietly in the wheelchair for several minutes. After resting, participants will begin propelling at a comfortable speed at a low initial workload. Workload will be increased every minute. Propulsion speed will remain constant across all workloads. Test will end when participants reach 80% of age adjusted estimated maximum heart rate.

Wheelchair propulsion workload assessment: Participants will complete 20 one-minute propulsion bouts at a self-selected speed. Each one minute propulsion bout will be followed by a 2 minute rest period. Each propulsion bout will be at a different workload. After the first 10 propulsion bouts, participants will be provided with an extended rest period (5 to 30 minutes). For each participant, the maximum workload to be tested is based on their estimated maximum workload. Estimate maximum workload is based on the Heart Rate-Workload relationship documented during the submaximal test.

The workloads of the N=20 propulsion bouts will be divided into two groups of N=10 (Group A and Group B). The total workload of each group will be equal. Within each group, workload sequence is fixed and arranged in a non-ascending or descending order. Completion order of the groups will be counterbalanced within sex. Within participants, completion order will be counterbalanced across days

Undersøgelsestype

Interventionel

Tilmelding (Faktiske)

11

Fase

  • Ikke anvendelig

Kontakter og lokationer

Dette afsnit indeholder kontaktoplysninger for dem, der udfører undersøgelsen, og oplysninger om, hvor denne undersøgelse udføres.

Studiesteder

    • Alabama
      • Homewood, Alabama, Forenede Stater, 35209
        • UAB/Lakeshore Research Colaborative Building

Deltagelseskriterier

Forskere leder efter personer, der passer til en bestemt beskrivelse, kaldet berettigelseskriterier. Nogle eksempler på disse kriterier er en persons generelle helbredstilstand eller tidligere behandlinger.

Berettigelseskriterier

Aldre berettiget til at studere

18 år og ældre (Voksen, Ældre voksen)

Tager imod sunde frivillige

Ja

Køn, der er berettiget til at studere

Alle

Beskrivelse

Inclusion Criteria:

  • age 18 years or older
  • cleared to participate in physical activity as determined by the Physical Activity Readiness Questionnaire for Everyone (PAR-Q+)
  • self-reported ability to propel a manual wheelchair
  • not currently disabled

Exclusion Criteria:

  • no additional exclusion criteria if otherwise eligible to participate

Studieplan

Dette afsnit indeholder detaljer om studieplanen, herunder hvordan undersøgelsen er designet, og hvad undersøgelsen måler.

Hvordan er undersøgelsen tilrettelagt?

Design detaljer

  • Primært formål: Grundvidenskab
  • Tildeling: N/A
  • Interventionel model: Enkelt gruppeopgave
  • Maskning: Ingen (Åben etiket)

Våben og indgreb

Deltagergruppe / Arm
Intervention / Behandling
Eksperimentel: Workload conditions to be tested
The intervention is the external workload a participant propels against. Participants will propel against N=20 different external workloads.External workload will be controlled by the wheelchair ergometer.
Participants will complete 20 one-minute manual wheelchair propulsion bouts. Each one minute propulsion bout will be followed by a 2 minute rest period. Each propulsion bout will be at a different workload. After every 10 propulsion bouts, participants will be provided with an extended rest period (5 to 30 minutes). For each participant, the maximum workload to be tested is based on their estimated maximum workload. Estimate maximum workload is based on the HR-Workload relationship documented during a prior sub maximal test to 80% of age adjusted maximum heart rate.

Hvad måler undersøgelsen?

Primære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Self-Selected Speed (meters per second)
Tidsramme: Seconds 20 to 40 of each 1 minute propulsion bout
Average linear propulsion speed during each completed propulsion cycle (i.e. contact+recovery) averaged across all completed propulsion cycles in the specified time frame.
Seconds 20 to 40 of each 1 minute propulsion bout
Average Rolling Resistance (Newtons)
Tidsramme: Seconds 20 to 40 of each 1 minute propulsion bout
Average rolling resistance during each completed propulsion cycle (i.e. contact+recovery) averaged across all completed propulsion cycles in the specified time frame.
Seconds 20 to 40 of each 1 minute propulsion bout

Sekundære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Number of completed propulsion cycles used to generate the outcomes of interest
Tidsramme: Seconds 20 to 40 of each 1 minute propulsion bout
The number of complete propulsion cycles occurring in the specified time frame. A complete propulsion cycle is defined as beginning with the onset of contact with the pushrim and ending with the onset of contact of the next propulsion cycle. A propulsion cycle includes contact and recovery.
Seconds 20 to 40 of each 1 minute propulsion bout
Average resultant force (Newtons)
Tidsramme: Seconds 20 to 40 of each 1 minute propulsion bout
Average resultant force during the contact phase of each completed propulsion cycle averaged across all completed propulsion cycles in the specified time frame.
Seconds 20 to 40 of each 1 minute propulsion bout
Average rate of rise of resultant force (Newtons per second squared)
Tidsramme: Seconds 20 to 40 of each 1 minute propulsion bout
Average rate of rise of resultant force during the contact phase of each completed propulsion cycle averaged across all completed propulsion cycles in the specified time frame.
Seconds 20 to 40 of each 1 minute propulsion bout
Average push frequency (pushes per minute)
Tidsramme: Seconds 20 to 40 of each 1 minute propulsion bout
For the specified time frame, the total number of completed propulsion cycles divided by the time to complete all the propulsion cycles in seconds multiplied by 60 seconds.
Seconds 20 to 40 of each 1 minute propulsion bout
Average push length (Degrees)
Tidsramme: Seconds 20 to 40 of each 1 minute propulsion bout
The distance over which a propulsive torque is applied to the pushrim during the contact phase of each complete propulsion cycle averaged across all completed propulsion cycles in the specified time frame.
Seconds 20 to 40 of each 1 minute propulsion bout
Average propulsive torque (Newton meter)
Tidsramme: Seconds 20 to 40 of each 1 minute propulsion bout
Average propulsive torque during the contact phase of each completed propulsion cycle averaged across all completed propulsion cycles in the specified time frame.
Seconds 20 to 40 of each 1 minute propulsion bout
Average push power output (Watts)
Tidsramme: Seconds 20 to 40 of each 1 minute propulsion bout
Average power during the contact phase of each each completed propulsion cycle averaged across all completed propulsion cycles in the time frame of interest. Push power output represents the energy the person applies to the pushrim during the contact phase.
Seconds 20 to 40 of each 1 minute propulsion bout
Average total work per push (Joules)
Tidsramme: Seconds 20 to 40 of each 1 minute propulsion bout
Total work during the contact phase of each completed propulsion cycle averaged across all completed propulsion cycles in the time frame of interest.
Seconds 20 to 40 of each 1 minute propulsion bout
Average external power output (Watts)
Tidsramme: Seconds 20 to 40 of each 1 minute propulsion bout
Average external power output during the entire propulsion cycle (i.e. contact and recovery) averaged across all completed propulsion cycles in the specified time frame. External power output represents the energy expended by the user-wheelchair system.
Seconds 20 to 40 of each 1 minute propulsion bout
Frequency of each unique propulsion pattern
Tidsramme: Seconds 20 to 40 of each 1 minute propulsion bout
For each complete propulsion cycle during the specified time frame, the recovery pattern will be classified into one of 5 categories: semi-circular, arcing, single loop, double loop, or indeterminate. The number of cycles and overall percentage in each category will be reported. Overall percentage is defined as [number of cycles in a category/total number of cycles * 100].
Seconds 20 to 40 of each 1 minute propulsion bout

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Datoer for undersøgelser

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Studer store datoer

Studiestart (Faktiske)

7. august 2021

Primær færdiggørelse (Faktiske)

13. november 2021

Studieafslutning (Faktiske)

13. november 2021

Datoer for studieregistrering

Først indsendt

16. juli 2021

Først indsendt, der opfyldte QC-kriterier

2. august 2021

Først opslået (Faktiske)

3. august 2021

Opdateringer af undersøgelsesjournaler

Sidste opdatering sendt (Faktiske)

24. februar 2022

Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier

22. februar 2022

Sidst verificeret

1. februar 2022

Mere information

Begreber relateret til denne undersøgelse

Andre undersøgelses-id-numre

  • IRB-300007513

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