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01-05-2017 | Original Article

The time course of short-term hypertrophy in the absence of eccentric muscle damage

Authors: Matt S. Stock, Jacob A. Mota, Ryan N. DeFranco, Katherine A. Grue, A. Unique Jacobo, Eunhee Chung, Jordan R. Moon, Jason M. DeFreitas, Travis W. Beck

Published in: European Journal of Applied Physiology | Issue 5/2017

Abstract

Background

It has been proposed that the increase in skeletal muscle mass observed during the initial weeks of initiating a resistance training program is concomitant with eccentric muscle damage and edema.

Purpose

We examined the time course of muscle hypertrophy during 4 weeks of concentric-only resistance training.

Methods

Thirteen untrained men performed unilateral concentric-only dumbbell curls and shoulder presses twice per week for 4 weeks. Sets of 8–12 repetitions were performed to failure, and training loads were increased during each session. Subjects consumed 500 ml of whole milk during training. Assessments of soreness, lean mass, echo intensity, muscle thickness, relaxed and flexed arm circumference, and isokinetic strength were performed every 72 or 96 h.

Results

Soreness, echo intensity, relaxed circumference, and peak torque data did not significantly change. Significant increases in lean mass, muscle thickness, and flexed circumference were observed within seven training sessions. Lean mass was elevated at tests #7 (+109.3 g, p = .002) and #8 (+116.1 g, p = .035), with eight different subjects showing changes above the minimal difference of 139.1 g. Muscle thickness was elevated at tests #6 (+0.23 cm, p = .004), #7 (+0.31 cm, p < .001), and #8 (+0.27 cm, p < .001), with ten subjects exceeding the minimal difference of 0.24 cm. There were no changes for the control arm.

Conclusion

In individuals beginning a resistance training program, small but detectable increases in hypertrophy may occur in the absence of eccentric muscle damage within seven training sessions.

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Title: The time course of short-term hypertrophy in the absence of eccentric muscle damage
Authors: Matt S. Stock
Jacob A. Mota
Ryan N. DeFranco
Katherine A. Grue
A. Unique Jacobo
Eunhee Chung
Jordan R. Moon
Jason M. DeFreitas
Travis W. Beck
Publication date: 01-05-2017
Publisher: Springer Berlin Heidelberg
Published in: European Journal of Applied Physiology / Issue 5/2017
Print ISSN: 1439-6319
Electronic ISSN: 1439-6327
DOI: https://doi.org/10.1007/s00421-017-3587-z

At a glance: The ONWARDS insulin icodec trials

Springer Medicine

The time course of short-term hypertrophy in the absence of eccentric muscle damage

Abstract

Background

Purpose

Methods

Results

Conclusion

At a glance: The ONWARDS insulin icodec trials

Springer Medicine

Abstract

Background

Purpose

Methods

Results

Conclusion

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