Adolescent Idiopathic Scoliosis (AIS) Girls might have Higher Metabolic Cost during Modified High-Intensity Interval Training (HIIT)
Invited conference paper presented and published in conference proceedings
CUHK Authors
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AbstractIntroduction
Adolescent idiopathic scoliosis (AIS) patients are found to have lower level of physical activity
and are associated with poorer bone and muscle health. Results from our previous study showed
benefits of modified high-intensity interval training (HIIT) to improve musculoskeletal health
and psychological well-beings in AIS girls. It is important to understand the metabolic demand
in AIS patients so that exercise can be prescribed at appropriate intensity level to optimize
training effects. This prospective case-control study aimed to investigate the metabolic demand
in AIS girls when performing modified HIIT.
Methods
Twenty-two girls (10 AIS girls with Cobb angle of 15° to 39˚ and 12 gender-matched healthy
controls) aged between 10 to 16 were recruited. Subjects were instructed to perform two trials
of a 7-min modified HIIT with 10-min rest in-between. Demographic data and clinical features
of AIS were obtained. Body composition parameters were measured by bioelectrical
impedance analyzer. Breath-by breath gas exchange parameters including oxygen consumption
(VO2) and heart rate (HR) were measured using telemetric portable gas analyzer system
(COSMED K5, Italy). Rate of perceived exertion (RPE) was obtained during exercise.
Metabolic demand between AIS and controls was compared using MANOVA with covariates
adjustment.
Results
AIS had earlier onset of menarche (p=0.01), higher visceral adipose tissue (p=0.04) and
percentage body fat (p=0.03) as compared to controls. Predicted VO2 peak in both groups
showed no significant difference. With covariates adjusted, AIS showed significantly higher
VO2 average in both trials (p=0.014 and p=0.11 respectively), and highest measured VO2 peak
in the 2nd trial (p=0.004) as compared to controls. AIS showed a drop in HR peak and average
during the 2nd trial with a numerically higher RPE. AIS also exercised at a similar percentage
of VO2 maximum than controls (64.26% vs 63.60%).
Conclusion
AIS girls performed the modified HIIT at an average of 64.33% VO2 maximum which is
considered to be an appropriate moderate exercise intensity level. However, they were found
to have higher oxygen consumption indicating a higher metabolic cost when performing
modified HIIT. AIS also had a numerically higher RPE in both trials indicating that they might
be easier and quicker to get fatigue than controls.
Discussion
The current findings showed that AIS girls had a higher metabolic cost than controls when
performing modified HIIT. Modifications of exercise programme catered for AIS could include
slower exercise rhythm, frequent exercise breaks and using more cueing to avoid easy fatigue
and exercising at moderate intensity level to optimise exercise benefits.
Declaration
This study is supported by the School Research Grant, Tung Wah College, Hong Kong SAR,
China (Project number: 2019-02-52-SRG190201).
Adolescent idiopathic scoliosis (AIS) patients are found to have lower level of physical activity
and are associated with poorer bone and muscle health. Results from our previous study showed
benefits of modified high-intensity interval training (HIIT) to improve musculoskeletal health
and psychological well-beings in AIS girls. It is important to understand the metabolic demand
in AIS patients so that exercise can be prescribed at appropriate intensity level to optimize
training effects. This prospective case-control study aimed to investigate the metabolic demand
in AIS girls when performing modified HIIT.
Methods
Twenty-two girls (10 AIS girls with Cobb angle of 15° to 39˚ and 12 gender-matched healthy
controls) aged between 10 to 16 were recruited. Subjects were instructed to perform two trials
of a 7-min modified HIIT with 10-min rest in-between. Demographic data and clinical features
of AIS were obtained. Body composition parameters were measured by bioelectrical
impedance analyzer. Breath-by breath gas exchange parameters including oxygen consumption
(VO2) and heart rate (HR) were measured using telemetric portable gas analyzer system
(COSMED K5, Italy). Rate of perceived exertion (RPE) was obtained during exercise.
Metabolic demand between AIS and controls was compared using MANOVA with covariates
adjustment.
Results
AIS had earlier onset of menarche (p=0.01), higher visceral adipose tissue (p=0.04) and
percentage body fat (p=0.03) as compared to controls. Predicted VO2 peak in both groups
showed no significant difference. With covariates adjusted, AIS showed significantly higher
VO2 average in both trials (p=0.014 and p=0.11 respectively), and highest measured VO2 peak
in the 2nd trial (p=0.004) as compared to controls. AIS showed a drop in HR peak and average
during the 2nd trial with a numerically higher RPE. AIS also exercised at a similar percentage
of VO2 maximum than controls (64.26% vs 63.60%).
Conclusion
AIS girls performed the modified HIIT at an average of 64.33% VO2 maximum which is
considered to be an appropriate moderate exercise intensity level. However, they were found
to have higher oxygen consumption indicating a higher metabolic cost when performing
modified HIIT. AIS also had a numerically higher RPE in both trials indicating that they might
be easier and quicker to get fatigue than controls.
Discussion
The current findings showed that AIS girls had a higher metabolic cost than controls when
performing modified HIIT. Modifications of exercise programme catered for AIS could include
slower exercise rhythm, frequent exercise breaks and using more cueing to avoid easy fatigue
and exercising at moderate intensity level to optimise exercise benefits.
Declaration
This study is supported by the School Research Grant, Tung Wah College, Hong Kong SAR,
China (Project number: 2019-02-52-SRG190201).
Acceptance Date08/03/2022
All Author(s) ListRufina Wing- Lum Lau, Jack Chun-Yiu Cheng , Stanley Sai-Cheun Hui, Tsz-Ping Lam
Name of ConferenceSOSORT International Congress 2022
Start Date of Conference04/05/2022
End Date of Conference07/05/2022
Place of ConferenceSpain
Country/Region of ConferenceSpain
Year2022
LanguagesEnglish-United Kingdom
