Cross Country Poling Specific Motor Skill- and Strength Training.

Healthy Clinical Trial

— CPMST  

Official title:

Motor Skill- and Strength Training; Importance for Technique, Work Economy and Time Performance in Cross Country Poling

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT03078673
• Other study ID #: CPMST
• Status: Completed
• Phase: N/A
• Start date: June 20, 2017
• Est. completion date: July 1, 2019

Study information

• Verified date: May 2017
• Source: University of South-Eastern Norway
• Contact: n/a
• Is FDA regulated: No
• Study type: Interventional

Clinical Trial Summary

Will motor skill- and/or strength training affect technique, work economy and time performance in cross-country poling? Competitive cross-country skiers (age 16- 30) will perform a 10 weeks training intervention. They will be randomized in one of the following three groups: poling specific motor skill training 3 times per week in addition to their regular training, maximal strength training 3 times per week in addition to their regular training and a control group who only perform their regular training. Pre- and post intervention, all participants will perform tests in VO2max (running), VO2max (poling), work economy (poling), video and inertial measurement unit (IMU) analyzes of poling technique, time performance test (poling), motor skill tests and maximal strength tests.

Description:

Motor Skill- and Maximal Strength Training; Importance for Technique, Work Economy and Time Performance in Cross Country Poling Purpose The relative use of poling in classic cross-country skiing has increased over the last years. (Danielsen et al 2015). As a result of this poling performance has become increasingly important for over all classic cross-country skiing performance. Poling performance with best possible technical skills, implying high velocity with a least possible energy cost (C) should thus be beneficial. Previous research (Østerås et al 2002) has shown improved work economy in poling after maximal strength training (MST). To the investigators knowledge, the effect of motor skill training (MOT) on C has not previously been investigated. In this study MOT and MST will therefore be investigated (in two different groups of cross-country skiers), how they may affect poling technique, C, lactate threshold (LT) and poling performance. The results from this study may give further insight and knowledge in scientific based training practice.

The purpose of this study is thus to investigate if:

1. MOT results in technical changes in poling?

2. MST results in technical changes in poling?

3. MOT improves C in poling?

4. MST improves C in poling?

5. changes in 1-4 improves time performance in poling?

In order to investigate this, competitive cross-country skiers (age 16- 30) will perform a 10 weeks training intervention. They will be randomized in one of the following three groups: poling specific motor skill training (10-12 x 3 repetitions maximum, RM) in specific designed cross country exercises 3 times per week in addition to their regular training. Further, maximal strength training in squat, dead lift, bench press, bench pull and pull down (2-5 x 3 repetitions RM) 3 times per week in addition to their regular training and a control group who only perform their regular training. Pre- and post intervention, all participants will perform tests in VO2max (running), VO2max (poling), work economy (poling), video and IMU analyzes of poling technique, time performance test (poling), motor skill tests and maximal strength tests.

Recruitment information / eligibility

• Status: Completed
• Enrollment: 45
• Est. completion date: July 1, 2019
• Est. primary completion date: April 1, 2019
• Accepts healthy volunteers: Accepts Healthy Volunteers
• Gender: All
• Age group: 16 Years to 30 Years

Eligibility

Inclusion Criteria:

• healthy, competitive cross country athletes 16-30 years old

Exclusion Criteria:

• contraindications to maximal strength training and strength and endurance testing

Related Conditions & MeSH terms

• Healthy

Intervention

Other:
• training intervention, motor skill training
cross country specific motor skill strength training
• training intervention, maximal strength training
general maximal strength training
• control group
regular training

Locations

Country	Name	City	State
Norway	Telemark UC	Bø	Telemark

Sponsors (2)

Lead Sponsor	Collaborator
University of South-Eastern Norway	The Norwegian Olympic Sports Center (Olympiatoppen)

Country where clinical trial is conducted

Norway, 

References & Publications (2)

Danielsen J, Sandbakk Ø, Holmberg HC, Ettema G. Mechanical Energy and Propulsion in Ergometer Double Poling by Cross-country Skiers. Med Sci Sports Exerc. 2015 Dec;47(12):2586-94. doi: 10.1249/MSS.0000000000000723. — View Citation

Østerås H, Helgerud J, Hoff J. Maximal strength-training effects on force-velocity and force-power relationships explain increases in aerobic performance in humans. Eur J Appl Physiol. 2002 Dec;88(3):255-63. Epub 2002 Oct 17. — View Citation

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Time trial poling on a roller ski tarmac track	Seconds used in a 6 km track.	10 weeks
Secondary	Video analyzes of technique	Joint angles. Unique outcome measure.	10 weeks
Secondary	Analyzes of angular velocity by use of IMU (inertial movement devices)	Degree/second by use of gyrometer from the Musclelab System from Ergotest Technology. Unique outcome measure.	10 weeks
Secondary	Analyzes of external force (N) in poles during poling	Force measurements by use of the Musclelab System from Ergotest Technology. Unique outcome measure.	10 weeks
Secondary	Maximal pulldown strength (RM/kg)	Kilos in pulldown. Unique outcome measure.	10 weeks
Secondary	Maximal leggpress strength (RM/kg)	Kilos in leggpress. Unique outcome measure.	10 weeks
Secondary	Maximal pulldown power (Watt)	Watts in pulldown by use of Musclelab.System (Ergotest Technology). Unique outcome measure.	10 weeks
Secondary	Maximal leggpress power (Watt)	Watts in leggpress by use of Musclelab.System (Ergotest Technology). Unique outcome measure.	10 weeks
Secondary	Maximal oxygen uptake (VO2max, ml/kg/min) in running on treadmill	Ergospirometrical incremental (ramp) protocols using Cortex Metalyzer. Unique outcome measure.	10 weeks
Secondary	Maximal oxygen uptake (VO2max, ml/kg/min) in poling on treadmill	Ergospirometrical incremental (ramp) protocols using Cortex Metalyzer. Unique outcome measure.	10 weeks
Secondary	Lactate threshold (mmol/L blood) in poling on treadmill	Measurement of lactate using Lactate Scout (EKF Diagnostics) in different submaximal work periods up to the point reaching warm up values plus 2,3 mmol/L. Unique outcome measure.	10 weeks
Secondary	Poling economy	Measurement of oxygen consumption per meter poling. Unique outcome measure.	10 weeks