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Brandon Warner, Kyung-Min Kim, Joseph M. Hart and Susan Saliba

Context:

Quadriceps function improves after application of focal joint cooling or transcutaneous electrical nerve stimulation to the knee in patients with arthrogenic muscle inhibition (AMI), yet it is not known whether superficial heat is able to produce a similar effect.

Objective:

To determine quadriceps function after superficial heat to the knee joint in individuals with AMI.

Design:

Single blinded randomized crossover.

Setting:

Laboratory.

Patients:

12 subjects (4 female, 8 males; 25.6 ± 7.7 y, 177.2 ± 12.7 cm, 78.4 ± 18.2 kg) with a history of knee-joint pathology and AMI, determined with a quadriceps central activation ratio (CAR) of <90%.

Intervention:

3 treatment conditions for 15 min on separate days: superficial heat using a cervical moist-heat pack (77°C), sham using a cervical moist pack (room temperature at about 24°C), and control (no treatment). All subjects received all treatment conditions in a randomized order.

Main Outcome Measures:

Central activation ratio and knee-extension torque during maximal voluntary isometric contraction with the knee flexed to 60° were collected at pre, immediately post, 30 min post, and 45 min posttreatment. Skin temperature of the quadriceps and knee and room temperature were also recorded at the same time points.

Results:

Three (treatment conditions) by 4 (time) repeated ANOVAs found that there were no significant interactions or main effects in either CAR or knee-extension torque (all P > .05). Skin-temperature 1-way ANOVAs revealed that the skin temperature in the knee during superficial heat was significantly higher than other treatment conditions at all time points (P < .05).

Conclusions:

Superficial heat to the knee joint using a cervical moist-heat pack did not influence quadriceps function in individuals with AMI in the quadriceps.

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Jennifer Ostrowski, C. Collin Herb, James Scifers, Teraka Gonzalez, Amada Jennings and Danvirg Breton

Orthop Trauma Surg . 2005 ; 86 ( 4 ): 819 – 825 . 6. Knight C , Rutledge C , Cox M , Acosta M , Hall S . Effect of superficial heat, deep heat, and active exercise warm-up on the extensibility of the plantar flexors . Phys Ther . 2001 ; 81 ( 6 ): 1206 – 1214 . PubMed ID: 11380276

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Ken D. Sumida, Marcia B. Greenberg and Janeen M. Hill

Context:

The effectiveness of thermal modalities on pain relief should be short lived.

Objective:

To examine the effectiveness of hot and cold gel packs in reducing de-layed-onset muscle soreness (DOMS) 30 min after treatment.

Design:

Participants performed eccentric contractions of the nondominant elbow flexors, returned 48 hr later, and were randomly assigned to 1 of 4 treatments (n = 17–18 per group): a 20-min application of a hot, cold, or room-temperature gel pack or no treatment.

Measures:

Pain was assessed using a visual analog scale (VAS) before and 48 hr after exercise and 30 min after the treatment.

Results:

All groups demonstrated a significant (P < .05) elevation in their VAS 48 hr after the exercise, 0.10 ± 0.04 cm (initial) vs. 3.27 ± 0.24 cm (48 hr later). Only the hot-pack treatment group indicated a significant (P < .05) reduction in pain: 1.66 ± 0.30 cm (after treatment).

Conclusion:

Superficial heat can attenuate DOMS 30 min after treatment.