Category: Research Corner

Short-Term Effects of Lower Thoracic Manipulation on Lower Trapezius Muscle Strength

Research Review: Short-Term Effects of Lower Thoracic Manipulation on Lower Trapezius Muscle Strength

By Nicholas Rolnick PT, DPT, MS, CSCS

Edited by Brent Brookbush DPT, PT, COMT, MS, PES, CES, CSCS, ACSM H/FS

Original Citation: Cleland J, Selleck B, Stowell T, Brown L, Alberini S, St. Cyr H, Caron T. Short-term Effects of Thoracic Manipulation on Lower Trapezius Muscle Strength.  Journal of Manual & Manipulative Therapy. 2004; 12(2): 82-90. ABSTRACT.

Why the Study is Relevant: The lower trapezius assists the serratus anterior in upward rotation of the scapula, a motion that is essential for elevating the arm overhead (flexion and/or abduction) (1). The lower trapezius has a propensity toward under-activity and latent recruitment in individuals exhibiting shoulder, thoracic spine and/or cervical dysfunction (3-7). While strengthening/activation techniques are commonly used to address this issue, practitioners have noted altered muscle recruitment post joint mobilization/manipulation. This 2004 study from Franklin Pierce College in New Hampshire was the first study to investigate the acute effects of a lower thoracic manipulat

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Impaired Core Stability Is Predictor of Knee Injury Risk

Research Review: Impaired Core Stability Is Predictor of Knee Injury Risk

By Jinny McGivern, PT, DPT, CFMT, Certified Yoga Instructor

Edited by Brent Brookbush DPT, PT, COMT, MS, PES, CES, CSCS, ACSM H/FS

Original Citation:

  • Zazulak, B. T., Hewett, T. E., Reeves, N. P., Goldberg, B., and Cholewicki, J. (2007). Deficits in neuromuscular control of the trunk predict knee injury risk. The American journal of sports medicine, 35(7), 1123-1130. ARTICLE

Why the Study Is Relevant: Knee injuries are common during sports and likely have many contributing variables (1).  This 2007 study investigated whether impairments in neuromuscular control of the trunk (a.k.a. core stability) could help predict knee injuries in male and female athletes over a three-year period.  The researchers found that injured athletes had greater trunk displacement following the sudden removal of a significant isometric force when compared to uninjured athletes. These findings highlight a possible gap in the design of interventions to aid in reducing the risk of injury.

 

Study Summary

Stu

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Joint Power Absorption in Ranking Plyometric Exercises

Research Review: Joint Power Absorption in Ranking Plyometric Intensities

By Arran McManus MSc, BSc (Hons), ASCC, PGCAP & FHEA

Edited by Brent Brookbush DPT, PT, COMT, MS, PES, CES, CSCS, ACSM H/FS

 

Original Citation: Van Lieshout, KG., Anderson, JG., Shelburne, K.B.  and Davidson, BS. (2014). Intensity rankings of plyometric exercises using joint power absorption. Clinical Biomechanics, 29, 918-922. Abstract

Why the Study Is Relevant:

Plyometric exercises are recommended to enhance sports performance, but may also be part of a rehabilitation program post injury (1, 2). Due to the increase in intensity and stress on joints, subjective rankings and progressions of plyometric exercise may not be appropriate. This 2014 study, is the first research study (to our knowledge) that aimed at quantifying the intensity of seven, lower extremity plyometric exercises commonly used to rehabilitation setting.

SL Jump

Single Leg

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Effect of Different Inter-set Rest Intervals on Muscle Performance During Leg Press Exercise in Trained Older Women

Research Review: Effect of Different Inter-set Rest Intervals on Muscle Performance During Leg Press Exercise in Trained Older Women

By Crystal Chariton MA, LMT, NSCA- CSCS, NASM- CPT, USAW

Edited by Brent Brookbush DPT, PT, COMT, MS, PES, CES, CSCS, ACSM H/FS

Original Citation:

Jambassi Filho, J., Gobbi, L., Gurjao, A., Goncalves, R., Prado, Alexandre, and Gobbi, S. (2013). Effect of different rest intervals, between sets, on muscle performance during leg press exercise, in trained older women. Journal of Sports Science and Medicine, (12), 138-143. Abstract

Why the Study Is Relevant:

Previous research has demonstrated that longer (2- to 3-minute) inter-set rest periods promote a greater number of repetitions than shorter (1-minute or less) inter-set rest periods in younger and older women, regardless of whether the exercise was lower-body, upper-body, multi-joint or single-joint (1,2). Prior to this 2013 study, the influence of inter-set rest periods on lower limb performance in older women with resistance training experience was unknown. Researchers investigated the influence of 1- and 3- minute inter-set rest

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Hip Muscle Activity During Hip Strengthening Exercises in Distance Runners

Research Review: Hip Muscle Activity During Hip Strengthening Exercises in Distance Runners

By David Chessen DPT, PT, MBA, CSCS

Edited by Brent Brookbush DPT, PT, COMT, MS, PES, CES, CSCS, ACSM H/FS

Original Citation: McBeth, J. M., Earl-Boehm, J. E., Cobb, S. C., and Huddleston, W. E. (2012). Hip muscle activity during 3 side-lying hip-strengthening exercises in distance runners. Journal of Athletic Training47(1), 15-23. ARTICLE

Why the Study is Relevant: Several studies have correlated a reduction in hip abductor strength (the gluteus medius specifically) with knee pain (2-4). This 2012 study investigated muscle activity of the gluteus medius, tensor fascia latae, anterior hip flexors and gluteus maximus during side-lying hip strengthening exercises. Side-lying abduction was found to activate the gluteus medius more effectively than other exercises examined in this study.

 

Study Summary

Study Design
Single session quasi-experimental laboratory study

Level of Evidence
IIB evidence from at least one other type of quasi-experimental study<

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